genral final with new questions to read

GENERAL ENGINEERING KNOWLEDGE (GENERAL)

1. What type of tubes used in Air comp cooler?

Spring

floating

U type

fixed type

2. The water from discharge side of the centrifugal pump is supplied as sealing water to the stuffing box for the pump shaft at:

A. Sealing ring

B. Shaft sleeve

C. Lantern ring

D. Neck bush

3. Which of the following would be the correct way(s) of using a torque wrench?

A. Application of jerk pulls while tightening

B. Using an extension

C. Tightening beyond the characteristic clicking sound

D. None of the above

4. Chromium is a nobler metal when compared to that of steel. In some marine applications Chromium is electroplated to the steel surfaces. Why?

A. Chromium is a more noble metal so it will not get corroded and thus steel surfaces will remain protected

B. Chromium plating provides corrosion protection as well as high glossiness and high hardness for better wear resistance and reduced friction to the steel surfaces

C. Chromium plating is required for providing high glossiness and high hardness for better wear resistance and reduced friction to the steel surfaces and not for corrosion protection

D. Chromium reacts with steel to form an alloy during electroplating which is corrosion resistant

5. Correct method of greasing a centrifugal pump bearing is:

A. To pump the grease until you feel high back pressure on the Grease pump

B. To pump the greasefor 3-4 pumping strokes of Grease pump for each bearing

C. To pump the grease when the pump is stopped and drain any old grease at the same time by opening the drain plug, giving only 3-4 pumping strokes on Grease pump for each bearing. the drain plug should then be replaced

D. To pump the grease when the pump is running and drain any old grease at the same time by opening the drain plug, until all the old grease is removed and new grease starts coming out of the drain, repeating same for each bearing. the drain plug should then be replaced

6. Centrifugal pumps cannot handle air and require priming. But you are aware that centrifugal which on the same principal can handle air very well. Which two properties of air are responsible because of which the centrifugal pumps cannot handle air:-

A. Fluidity only B. Density only

C. Both fluidity and density D. Compressibility

7. Pump driven clutch type attached vacuum pumps are commonly used for priming ballast pumps and emergency fire pumps. What is the factor which clutches the vacuum pump clutch to the pump clutch during start of the pump?

A. Low suction pressure acting against the spring loaded clutching piston B. High suction pressure acting against the spring loaded clutching piston C. Low discharge pressure acting against the spring loaded clutching piston

D. High discharge pressure acting against the spring loaded clutching piston

8. It is given that engine room bilge pump has suction manifold on which 3 valves are located. One valve for the 3 engine room bilge wells suction, another one for Bilge tank suction and the third one is for sea water suction. It is found that the Bilge pump is unable to take suction from any of the bilge wells, but is able to take suction efficiently from Bilge tank. What is the most probable cause?

A. Pump suction filter cover gasket leaking B. Suction filter cover gasket of one of the Bilge wells is leaking

C. Bilge well suction pipeline leaking between individual bilge well valves and suction manifold valve D. Bilge pump suction pipeline leaking between the manifold and the pump

9. Increasing the rotational speed of a cargo pump the pump flow rate will:

A. Increase in direct proportion to the increase in speedB. Decrease in direct proportion to the increase in speedC. Flow rate doesn’t???t depend upon speedD. Flow

10. It has been reported that Engine room bilge pump was unable to take suction from Fwd. (P) bilge well while it taking suction efficiently from Fwd.(S) & aft bilge wells. What could be the most probable cause?

A. There is leakage in the bilge suction pipeline somewhere between the bilge wells and bilge pumpB. The Fwd. (P) bilge well suction valve might be leaking

C. The Fwd. (P) bilge well suction filter cover gasket might be leakingD. The pump needs to be overhauled

11. Which of the following is a correct point for sampling of system lube oil for on board or shore analysis?

A. StandpipesB. Purifier outlets

C. Inlet or outlet of L. O. coolersD. Tank drains

12. Which type of valve is not rotating type....

a) gate v/vb)butterfly v/vc)ball v/vd)plug v/v

13. Emergency steering testing

1. Weekly2. Monthly

3. At least 3 months4. Before arrival n departure

14. Rudder is locked at an angle & can be moved by manual change--------

1. Follow up

2. Non follow up

16. When securing a centrifugal distillate pump, which of the listed steps should be carried out FIRST?

1. Stop the pump.2. Close the pressure gage valves.

3. Trip the three-way solenoid valve.4. Close the sealing line valves to the pump.

17. Which of the following valves cannot prevent backflow of liquid in a pipeline?

A. Gate valve B. Globe Check Valve C. Swing Check Valve D. Angle check valve

18. After your overhaul a centrifugal pump is not rotating what may be the possible cause:

a. Uneven tightening of casing boltsb.Gasket thickness very thin

c.More wear ring clearanced.Only a

e. a and bf. a and c

19. Pump driven clutch type attached vacuum pumps are commonly used for priming ballast pumps and emergency fire pump. What is the factor which de-clutches the vacuum pump from the pump clutch?

A. Low suction pressure acting against the spring loaded declutching piston B. High suction pressure acting against the spring loaded declutching piston C. Low discharge pressure acting against the spring loaded declutching piston

D. High discharge pressure acting against the spring loaded declutching piston

20. The main disadvantages of a reciprocating pump over a Gear pump is that:

A. A gear pump is self priming while a reciprocating pump is not

B. Discharge of a gear pump is not affected by the direction of rotation while that of reciprocating pump is reversed

C. The discharge of reciprocating pump is pulsating and discharge rate is lesserD. Reciprocating pumps are only available in high capacities and for smaller capacities only gear pumps can be used

22. After cleaning the sea chest filter you have placed the filter in the body and tightened the cover. Which one of the following is the best alternative?

A. You can open the filter inlet and outlet valves & directly start using the filter

B. If you do not want to use the sea chest in question, you need not worry and you can open the valves when required

C. Sea Water inlet valve should be crack opened, the filter body should be purged, any leakages and thereafter filter can be kept isolated or used as requiredD. You will close the other side sea chest valves first and then open this side sea chest filter inlet and outlet valves

23. In which of the following types of refractory failure, softening of the refractory bricks takes place due to presence of sodium/vanadium in fuel?

A. Spalling B. Cracking C. Shrinkage cracking

D. Slagging

24. Centrifugal pump will typically give you a low flow rate at a lower pressure, where a piston pump will give you more pressure and higher flow rate. Is the statement correct?

A.TRUE

B.FALSEC. First Sentence is right. Second one is wrongD. I don’t know

25. You are pumping out sludge to a shore facility using your sludge pump. You find that the discharge rate of pump is very slow and suction filter is getting clogged frequently. What is the best alternative to counteract the problem?

A. Remove the pump suction filter and pump out the tank

B. Increase the tank temperature, keep an eye on the pump suction pressure and clean the filter as soon as it dropsC. As soon as the as the shore facility tells you that they are not receiving any sludge, you stop the pump and clean the filterD. Fabricate a bigger mesh size suction filter and use in place of normal filter so that frequency of filter blockage is reduced and you can get a better discharge rate

26. Pump Start but Motor get overloaded or Trip on overload. (A,B,C)

Alignment is wrong B. Gland packing too tight C. Worn out / Damaged ball bearing D. Cavitations exists E. All of the above

27. A ball valve is found leaking in service and needs to be overhauled. What type of repairs can be carried out?

a. The ball and seat can be lapped together b. The ball can be machined while the seat can be replaced

c. Normally both the non-metallic seats get worn out and have to be replaced d. Normally ball gets damaged and has to be replaced

28. The difference between the discharges of a centrifugal pump n reciprocating pumpthe discharge of centrifugal pump is ----------while that if reciprocating is ---------

A) Turbulent, LaminarB) Intermittent, continuous

C) Continuous, pulsatingD) Pulsating, continuous

29. Purifier is not rotating with desired rpm, reason?

1. Frequency low2. Bus bar voltage low

3. Friction pads worn out

30. The function of an accumulator on the discharge side of a reciprocating bilge pump is to:

A. Supply liquid even when the pump is not running

B. Dampen out the pressure pulses and smoothen the flow

C. Increase the discharge pressure by storing liquid under pressure D. No such device is required to be fitted to modern bilge pumps

31. The most important control measure to prevent boiler tube failure is:

A. Use of proper refractory material B. Proper maintenance of fuel burning equipment

C. Proper maintenance of boiler water condition

D. All of the above

32. Refer cooling tubes act as self-cooling & expansion by

a) Straight tubeb) U tube

c) Spring tube

33. F.O. transfer pump was working efficiently, but it stopped taking suction suddenly. There is a sounding of 6.0 m in the F.O. deep tank. The suction pressure gauge was renewed recently and is showing a positive pressure when pump is running, but Pump is not transferring any F.O. What is the most probable cause?

A. Pump is damaged and needs overhaulB. Suction filter cover gasket might leaking

C. Pump relief valve might be leakingD. The pump suction pipeline is blocked

34. A ball valve was found leaking in service. Upon inspection it was found that the PTFE seat had worn out and was renewed. The valve stopped leaking in closed condition. How do think a ball valve provides perfect sealing?

A. The seat fitted is slightly smaller than the outer dimensions of the ball, thus providing interference fit when closed

B. Either a floating seat is pressed onto trunnion supported ball by liquid pressure or floating ball is pressed on to the seatC. Ball is not exactly spherical and is shaped such that during closure the surface coming into contact with seat is of slightly bigger diameter providing sealingD. Seat is not exactly spherical, but slightly tapered so that during closure the ball sits tightly on the seat

35. Copper tubing is used in refrigerant system because

A) It has less internal resistanceB) It is cheaper compared to other materials.C) It is easier to check leaks in copper based systemD)None of the above

36. U R responsible for daily transfers of engine room bilges. U follow the sequences aft –fwd (P)-fwd(s) bilge well n u have never experienced a problem but 5/E started the transfer n first transferred forward (s) bilge well n without any problem n u join him later u find that bilge pump is not taking suction fr f(p) n aft bilge well n then u have checked everything is normal. What is the cause?

A) 5th engineer made a mistake by 1st transferring the fwd (s) bilge well, normal sequence of operation for engine room machineries should not b disturbed.

B) Fwd (s) Bilge well suction valve is leakingC) Bilge pump suction filter cover gasket is leaking.D) Fwd (s) Bilge well suction filter cover gasket is leaking.

37. The gland packing of centrifugal pump should have

A) Not allow any breakage under the suction pressure.

B) Should only allow drop by drop continuous leakage under positive suction pressure.C) Should allow considerable leakage

38. Which of the following valve is liable to open or close under pressure of fluid, if not locked in position?

1. Gate valve2. Globe valve

3. Plug valve

4. Butterfly valve

39. If dew point increases what happens to wet bulb temp and dry bulb temp?

Will be same

40. The dew point is reached when the wet bulb temperature is

Equal to the dry bulb temperature

41. As the amount of moisture in the air increases, the difference between the dry bulb and wet bulb temperatures will…………..

Decrease

Section 2:

1. ESD III refractory(C)a. Fireb. Insulation

c. Membrane walls

2. Change in volume in closed cooling system is achieved by(A) a. Fresh water expansion tank

3. Turbocharger most preferred(C)a. Cheapb. Boost air pressure

c. Increase efficiencyd. Reduce nox

4. Microbial degradation (A)a. Corrosive b. Stable emissionc. Caustic fired. All the above

5. Function of a de-super heater is to.

A. Protect super-heater from overheat

B. Control super-heater steam outlet temperature

C. Increase the efficiency of the boiler

D. Reduce steam temperature for auxiliary uses after steam super heater

6. Why should combustion blowers left running for while after firing a boiler?(B)a. To cool the furnace internal

b. To remove the gasesc. To cool tubesd. None

7. Dezincification of brass can be prevented by introduction of additives like(C)a. Nickelb. Cobalt

e. arsenicc. Tungsten

8. Principle of fire fighting onboard is(B,C,D)a. Watering of fire

b. Starving of fire

c. Cooling d. Smothering of fire

9. Which of the following used in boiler treatment is an oxygen scavenging(C)a. Polymerb. Neutralizing amine

c. Sodium sulphated. Filming amine

10.Salinity of distilled water produced depends upon _(A)a. Amount of feed setb. Amount of salt waterc. Temp of sea water inlet

11. High pressure differential of a M/E LO filter only can be reduced by_(A,B)a. Back flushing filterb. Changing over to standby filterc. Change M/E

12. The LO temperature (question not complete)a. Start increases immediatelyb. Start decreases immediatelyc. Will be maintained at the set pointd. Can’t maintain at the set point and decrease slowly

13. Fixed vane type emergency fire pump priming vacuum pump. After one week fire pump not taking suction. The vacuum pump is engaging, but not developing vacuum in the suction side. What will be the cause?(D)a. Suction filter of the pump cloggedb. Suction filter cover gasket leaksc. Vacuum pump not overhauled properly

d. Sealing water tank is empty

14. Single screw pump used as sludge pump the correct technical name.(C)a. Snake pumpb. Screw pump

c. Progressive cavity pumpd. Gear pump

15. Excessive lubricator in compressor leads to(C,D)a. Decompressionb. Detonation

c. Sticking in valves and d. Carry over and deposit of all particles in pipe line and reservoir

16. Corrosion occurs in cooling fresh water system of marine diesel engine(C,D) a. Stress corrosionb. Hot corrosionc. Bimetallic corrosion

d. Selective phase corrosion

17. Purpose of evaporator in domestic refrigeration system(C) a. To transmit latent heat of evaporationb. To absorb latent heat of fussion

c. To absorb latent heat of evaporationd. To transmit latent heat of fussion

18. Sudden closing and opening of valve in sea water pipeline leads to (B)a. Cavitations

b. Water hammeringc. Steam hammeringd. There is no problem

19. Centrifugal pump change over for pumping liquid of high specific gravity the(C) discharge at the rated capacity will be a. Increase b. Decrease

c. Samed. Convert 50%

20. Centrifugal pump change over for pumping liquid of high specific gravity what will change?(A,C)a. Discharge pressureb. Discharge head

c. Power consumptiond. Pump speed

21. Weldability steel depends on carbon equivalent(A)a. CE<= 0.35 b. CE between O.36 AND 0.4c. CE between o.41 and o.45d. CE between o.46 and o.5

22. Sea water outlet temperature of LO cooler decreased while main engine load and sea water inlet temperature not changed this indicates (B)a. Cooler efficiency has increased

b. Cooler efficiency has decreasedc. Sea water outlet temp nothing to do with efficiencyd. The flow of sea water reduced

23. Ballast pump suction filters during ballast in port purpose of getting blocked frequently you should (B)a. Remove the suction filter

b. Clean frequently as required and also open and check the sea chest filterc. Stop using the pump and keep fill in gravityd. Stop the ballast operation

24. When steel components electroplated with chromium are used in corrosive environment (A)a. Chrome plating prevents corrosionb. Protection to the steel will be preferentially corrodedc. Zinc plating is used on top of chrome plating for corrosion protectiond. Thickness of chrome plating to increase

25. Steel is an alloy of iron carbon and alloying components what is the carbon content? (B)a. Less than 1 %

b. Less than 2%c. Greater than 2%

a. Any % of carbon

26. Tube in air compressors , self compensating for expansion (if multi choice include coil tube also) a. Straight line tubeb. U tubec. Coil tubed. Floating tube kismet kaun sa hota h?

27. ___________ boiler feed pumps is used in modern ships (C)a. Reciprocating pumpb. Hele-shaw pump

c. Multistage centrifugal pumpd. Single stage centrifugal pump

28. The actuator of ballast valve in duct keel in port to carry de-ballast open best practice (B)

a. Interchange from another valve.

b. Manually operatedc. Leave the tank full and ask for shore assistance.d. Portable pump through manhole.

29. To reduce sulphur corrosion of main engine componentsa. Run at normal loadb. Atomizing pressure of fuelc. Rotor in exhaust valved. Fuel feed rate in purifier and purifier in series

30. Crude oil or crude oil+ballast water of same specific gravity ________ current in pump with same discharge pressurea. Moreb. Lessc. Same d. Does not depend

31. Refrigerant compressor will run continuously a. Too heavy cooling loadb. Air in the systemc. Insufficient refrigerantd. Any of the above

32. Protection of zinc protective coating is good ata. 50 degree Celsiusb. 65c. 90d. 115 a hoga ya b

33. Which anode ICCP a. Zincb. Siliconc. Lead , silverd. Platinized titanium

34. Effective soot blowing of exhaust (question changed)a. Minium chance of suction fireb. Increase efficiently c. Minimum heavy corrosion and leading tube failured. All the above

35. High chloride of boiler water is caused by (D)

a. Leaking tube of exhaust steam condenserb. Excessive steam leak resulting high c. Poor quality of boiler make up water

d. All the above

36. Hot work onboard a. Switch alarmb. Keep fire extinguisher c. Standby persond. All the above

37. Exhaust gas boiler fire suitable measuresa. Frequent suit blowing b. Increase engine speed to blow suitec. Stop cooling water circulation to avoid leakagesd. None of the above

38. In RT flex engine which of the following comment of main engine made redundant a. Fuel p/pb. Starting air v/v c. Starting air distributord. Auxiliary blower

39. Scale Formation in FWG evaporator side –a. increase in shell tempb. heat transfer impaired c. production affected d. all

40. Refer cooling tubes act as self-cooling & expansion by

a) Straight tubeb) U tubec) Spring tube

41. Which of the following is an important requirement for proper functioning of sacrificial anode system? (B)

A. Good Insulation between anodes and ship???s hull

B. Good electrical continuity between anodes and ship???s hull

C. Providing protection of anodes from being painted over during hull painting

D. Presence of an insulating material between anode and the cathode

42. Purifier leaking bowl opened, cleaned n seal ring changed and put back but still leaking what might b wrong? (D)

A. high temp

B. high density

C. disc size not proper

D. rpm low

43. Increased fuel injection temperature and maintaining recommended viscosity of a new bunkers fuel oil.

A. viscotherm running fine

B. Problem in viscotherm

C. best quality bunkers

D. None

44. Overall length of pairs of rams is reduced in which of the following tiller designs of a steering gear arrangement? (A)

A. Forked tiller design

B. Round arm tiller design

C. Conventional tiller design


45. In refrigeration circuit, the data logger will record what? (Multi choice)

1. Room temperature

2. Recharge temperature

3. Liquid line temperature

4. Solenoid valve operation

46. Engaging the turning gear and turning the engine until working temperatures are reduced

A. Blank starting air to the affected cylinder

B. Shut cylinder oil to the affected cylinder

C. Shut all cylinder liner ports of affected cylinder

D. Open relief valve of affected cylinder

47. You as a fourth engineer have taken over watch from third engineer. He said OWS is running in 0 ppm. But after taking over watch you observed that fresh water flushing valve is crack open. After closing it, suddenly the oil content has exceeded 15ppm. What will you do?

a. shut the OWS & inform CEO.

b. shut the OWS but no need to inform anyone.

c. Don't touch the appratus & inform CEO.

d. Just check that there is no visible colour/oil traces in sea water so don't have to inform anyone.

48. With ref to centrifugal p/p characteristics curves what will be the effect when p/p is started

A. with suction closed

B. with discharge shut

49. Non destructive test is

A. impact test

B. Ultrasonic test

50. Purpose of observation tank

A. to check water level

B. check any oil contaminate C. to check alkalinity

51. The coating on an electrode used for electric arc welding

A. creates a gas shield to prevent oxidation of the weld materialB. helps the weld formation by shaping the metal transfer C. provides an electrical insulation for the user D. All of the above

52. Which vessel is mostly used for carrying NH3/ LPG A. Semi pressurized

B. Fully pressurized

C. Fully refrigerated

D. All the above

53. Pump, when coupled to constant speed motor, the discharge quantity will not change with following pumps

A. hele-shaw B. steering gear swash plate type

C. Gear pump D. None

54. Electrical fire extinguished by A. Co2 B. DCP C. FOAM

55. over speed trip of generator—a. governor has to be check

b. fuel oil system

56. Purpose of preferential trip to prevent

A. blackout

B. To avoid overload

C. to start heavy machinery

D. all

57. Flooding in E/R,

A. pump out through OWS to overboardB. pump out through EMERGENCY Bilge pump C. pump out through General Service pump D. all

58. Sewage plant efficiency is gauged by A. suspended solid B. coli count C. BOD D. all

59. In Stern tube, aft of FOREWARD SEAL is leaking then

A. forward tank oil level increase

B. Drop in header tank level

C. Forward tank oil level decrease

D. Increase in header tank level

60. IG System number of no return valve

A. 1 B.2 C. 3 D. at least one if deck seal is provided otherwise two

61. Evaporator pressure testing in (multiple choice)

A. Pr. testing in shell

B. Leak test in vacuum pump and fittings

C. leak test in distillate pump

D. Vacuum testing in shell

62. PLATE type heat exchanger is preferred for following advantage

A. high heat transferB. easy to clean C. increased time between clean D. all

63. For carry out major work in tank –

A. First aid in entrance B. refreshment C. entry/exit time of personnel D. all

65. Increasing the rotational speed of a cargo pump the pump flow rate will:

A. Increase in direct proportion to the increase in speed

B. Decrease in direct proportion to the increase in speed

C. Flow rate doesn???t depend upon speed

D. Flow

66. Boiler water level control, controlling swell and shrink of boiler withA. feed water level

B. steam drum

C. water drum

D. none of the above

Section 3:

1. The pressure produced within the oil wedge of a rotating journal is ____. the same as the pressure in the lubricating system less than the pressure in the lubricating system

greater than the pressure in the lubricating system highest at the oil groove location

2. Which of the main shaft segments listed below, that are connected with the main engine, are coupled to the tail shaft flange?

Thrust shaft Stern-tube shaft

Intermediate shaft Crank shaft

3. Piping cross-sections over 30 cm in diameter are sized by the __________. inside diameter wall thickness

outside diameter threaded diameter

4. The ambient heat in an engine room which is identified by only a change in temperature is known as

sensible heat latent heat total heat residual heat

5. The usual number of single-acting pistons used in a variable stroke axial-piston pump used for steering gears is _____________.

3 or 5 5 or 7

7 or 9 9 or 11

6. Heavy soot accumulations in an auxiliary boiler could be caused by _____ water in the fuel oil excessive cycling high fuel oil pressure

improper burner maintenance

7. An axial piston pump differs from a radial piston pump, as the pistons of an axial piston pump are positioned _________.

radially from the shaft

parallel to each other and to the shaft parallel to each other but at a right angle to the shaft at an angle to each other and to the shaft

8. In reference to air conditioning, when air attains the maximum amount of moisture it can hold at a specific temperature, it is said to be _____________.

superheated

saturated condensed convected

9. Positive displacement, helical gear pumps are well suited for pumping oil because stuffing boxes eliminate the leakage problems usually associated with other gear pumps it is not necessary to closely maintain design clearances this pump

they are essentially self-priming and produce a high suction lift these pumps are designed with extreme tooth angles

10. The conical steel or composition cone installed on a propeller, known as a fairwater cone, provides which of the following benefits?

Reduce turbulence Help with lubrication Protect against electrolytic corrosion All of the above

11. It is desirable for an auxiliary boiler safety valve to pop open and re seat quickly to

give warning that excessive boiler pressure has been reached

prevent wire drawing of the disc and seat prevent valve pounding provide sufficient blow down

(multi b & d)

10. The purpose of the programmed purge cycle on an automatically fired auxiliary boiler is to

cool the furnace to prevent pre-ignition

remove explosive vapors from the furnace evaporate accumulated unburned fuel oil provide sufficient air in the furnace to allow ignition of the fuel

12. Short cycling of a refrigeration compressor refers to _____________. Frequently cutting out on over load.

frequently starting and stopping running too fast running too slow

13. The emergency bilge suction valve is typically used _____________. to inject cleaning additives when the bilges are extremely dirty when the main condenser becomes fouled, in order to provide additional cooling water

circulation to connect the rose box to the independent bilge suction

if the bilges become flooded and they cannot be emptied by any other means

14. The by-products of oxidation, as a result of water contamination of hydraulic oil, are generally ____________.

removed by cellulose type filters

gums, varnishes, and acids always neutralized by oil additives harmless and have no effect on system components

15. Which of the following describes the purpose of a striker or doubler plate? Provides a surface for the application of force, or the installation of machinery.

Provides landing surface for the sounding bob of a tank sounding tape. Absorbs machinery vibration. Prevents valve stem over travel.

16. Which of the following statements represents the proper relative direction of flow through a globe valve?

Direction of flow through the valve is unimportant. Direction of flow through the valve depends upon the type of seat design used in the valve.

Direction of flow should be from below the seat. Direction of flow should be from above the seat.

17. A portion of the cargo of an LNG carrier boils off during each voyage. How the cargo boils off is normally handled?uscg15

Compressed, condensed, and returned to the cargo tanks. Vented to the atmosphere.

Burned in the boilers. Mixed with nitrogen and recirculated through the primary barrier. Burnt off in a controlled manner through a chimney smoke stack from within the funnel.

18. In Vessel construction, beam brackets are triangular plates joining the deck beam to a bulkhead

frame stanchion deck longitudinal

19. The cylinders and intercoolers of most low pressure air compressors are cooled by _uscg2022

water oil

air CO2

20. A one ton air conditioning system has which of the listed operating characteristics? It forces approximately 1000kgs of refrigerant through the evaporator per day. It forces approximately 1000kgs of air per hour across the evaporator coils.

Its cooling power equals that of melting approximately 1000kgs of ice per day. It contains approximately 1000kgs of refrigerant.

21. Which of the materials listed is used as the dynamic seal material on mechanical seals installed on most centrifugal pumps used in water service?

Copper. Copper and carbon.

Carbon. Bronze.

22. When using a handheld hacksaw, you should apply pressure only on the forward stroke ____________.

only when cutting thin wall tubing only when cutting carbon steel only when cutting conduit

at all times

23. An important consideration in selecting a lubricating oil for use in a refrigeration compressor is for the oil to ____________.

have a high viscosity index mix readily with refrigerant have a high freezing point

have a low pour point

24. If the intercooler relief valve lifts while an air compressor is operating under load, you should check for ____

a defective pressure switch or pilot valve a leak in the intercooler piping leakage through the low pressure unloader control diaphragm

leaking high pressure discharge valves

25. Latent heat can be defined as the heat which must be added to a substance in order to change it from a

solid to liquid liquid to vapor solid to vapor

all of the above

26. The designation "schedule 80 extra strong " refers to ____________. weight of steel plate tensile strength of bolts

piping wall thickness tube bursting strength

27. Tapping threads into a blind hole should be finished by using a ______ short tap taper tap

plug tap

bottoming tap

28. Distilled water from an evaporator may be discharged into a potable water tank uscg268 through a detachable hose connection after passing through an activated charcoal filter after chemical analysis shows it is fit for consumption

through a solenoid operated three-way valve

29. The factors that determine the service life of packing in a pump will include which of the following conditions?

type of pump condition of the shaft length of time in use

all of the above

30. Personnel working with refrigeration systems and subject to the exposure of refrigerants should wear _______________.

face shield a respirator rubber gloves an all purpose gas mask

31. The ability of a metal to be hammered, or rolled out is called its ___________. ductibility elasticity

malleability fusibility

32. One characteristic of a lubricating oil adversely affecting the results of centrifuging is ____________.

high TBN value low oil floc point

low oil demulsibility low oil neutralization number

33. Which of the devices listed prevents water from entering a ship's hull via the propulsion shaft?

Stern tube packing or mechanical shaft seal Deflector ring and drain

Spring bearings Oiler rings

34. With reference to a vessel's structural integrity, the most significant characteristic of a cryogenic liquid is its ______________.

capability of causing brittle fractures highly corrosive action on mild steel vapor cloud which reacts violently with saltwater toxicity at atmospheric pressure

35. The heat required to change a substance from a solid to a liquid while at its freezing temperature, is known as the latent heat of _____________.

fusion vaporization condensation sublimation

36. Which of the following problems occurring in a hydraulic system can be caused by the use of an oil having a viscosity lower than specified?

Seal deterioration Fast response and hunting

Increased power consumption Oil film breakdown

37. The only means of removing the latent heat of condensation from a refrigerant in the normal refrigeration cycle is by ________.uscg224

passing it through the expansion valve

condensing refrigerant in the system condenser passing the gaseous refrigerant through the heat interchanger on the suction side of the

compressor maintaining a high pressure on the system's receiver

38. Which of the following statements represents the main difference between a stuffing box gland and a mechanical seal for sealing the shaft of a centrifugal pump?

Packed stuffing box glands are subject to wear, but mechanical seals are not. Packed stuffing box glands must be cooled by the liquid being pumped, but mechanical seals do

not require cooling.

If packing fails, the pump can be kept running temporarily by tightening the gland, but if a mechanical seal fails it must be totally renewed to stop the leakage.

The sealing surface of a mechanical seal is parallel to the shaft, but the sealing surface of a packed gland is perpendicular to the shaft.

39. In a shell-and-tube type hydraulic fluid cooler, the amount of heat transferred from the hydraulic fluid to the cooling water depends upon ________________.

the temperature of the hydraulic fluid the flow rate of both the cooling water and the hydraulic fluid the temperature of the cooling water

all of the above

40. The presence of scale and dirt on the saltwater side of lube oil cooler is usually indicated by ___________.

clogged lube oil strainers seawater leaking into the lube oil system decreasing lube oil pressure

gradually increasing lube oil temperature

41. The charging of a refrigerating system should be carried out by adding _____________. refrigerant vapor to the receiver only liquid refrigerant to the low side only

liquid refrigerant to the high side only liquid refrigerant to the high or low side

42. A leaking suction valve in the second stage of a two stage, high pressure, air compressor can cause excessively high ________________.

second stage discharge pressure

first stage discharge pressure pressure in the after cooler compressor final discharge temperature

43. Fabric type packing, such as flax or hemp, is best suited for _____________. low temperature use high temperature use use where alignment is critical packing valves with badly grooved stems

44. Which of the listed problems is occurring if a coil type high pressure evaporator constantly requires an increase in the coil steam pressure in order to maintain capacity?

The brine density is improper.

Heat transfer surfaces are being layered with scale. Impure distillate is being produced. Shell vapor pressure is constantly decreasing.

45. The terms rough, coarse, bastard, second cut, smooth, and dead smooth refer to the ________.

shape of the file

coarseness of the file teeth size of the file cuts of the file

46. A pump is defined as "a device that _____________." produces pressure

imparts energy to a fluid to move it from level "A" to level "B" creates a vacuum to move a liquid in all installations is to develop a pressure differential

47. Restrictions occurring in the small orifices of pneumatic control system components can be caused by

moisture in the compressed air supply excessive dryness in the compressed air supply pressure surging in the compressed air receiver insufficient lubrication of the system components

48. The principal purpose of sub cooling liquid refrigerant prior to its entering the expansion valve is to _

increase the refrigerating effect by decreasing the amount of flash gas allow the refrigerant to enter the throttling device in a saturated condition increase the refrigerating effect by increasing the amount of flash gas minimize the temperature drop of the liquid as it passes through the solenoid valve to the outlet

side

49. If a bilge pump is able to develop vacuum, but is unable to sufficiently pump out the bilges, you would check for ________.

the circuit breaker for leaks in the suction piping relief valve is not properly seated

the suction strainer

50. A first stage unloader installed in a low pressure air compressor is unable to completely retract. This will result in ____

overheating of the discharge valve loss of moisture in the air charge in the receiver frequent lifting of the intercooler relief valve

an abnormally low intercooler pressure

51. The heat removed from the refrigerant in the condenser of a refrigeration plant is the latent heat of expansion sensible heat of condensation

heat of compression all of the above

52. Excessive leakage and premature failure of valve packing is a result of ____________. opening a valve too quickly jamming a valve in the closed position low pressure fluid flow through the pipeline

a scored valve stem

53. The amount of fuel oil atomized by a return flow oil burner is directly controlled by the header supply valve burner root valve oil micrometer valve

fuel oil back pressure

54. Fuses are rated in _ voltage amperage interrupting capacity

all the above

6. When there is excessive ingress of water in the engine room onboard causing dangerous levels of bilge water,

A. Start oily water separator and pump overboard

B. Start General service pumps and pump bilges overboard

C. Use bilge injection valve and pump bilges overboard


7. If a radial piston hydraulic pump fails to deliver rated fluid volume, the cause can be _______________.

contaminated fluid pitted thrust rings worn pintle bearings

obstructed suctions passage

8. A fluctuating and unsteady vacuum in an evaporator may be caused by _____________.uscg99

1. wet steam entering the air ejector nozzle2. pinhole leaks in the evaporator tube nests3. rapid scaling on the evaporator tube nests4. high water levels in the last effect

9. A generator has been exposed to water and is being checked for its safe operation. Therefore, it is necessary to _______________.uscg272

check for shorted coils with a explosimeter. take moisture readings with a hydrometer

test insulation values with a megger ground the commutator, or slip rings and run it at half load

10. If the pointer fails to return to zero when a megger is disconnected, the_____________.332

pointer is stuck hair springs are burned out megger is out of calibration

megger is operating normally

11. When replacing ball bearings on an electric motor shaft, you should _____________.318(a) tap the outer race with a mallet(b) apply even pressure to the outer race

(c) apply even force to the inner race(d) apply pressure evenly to both the inner and outer races

62. The zipper of an immersion suit should be lubricated with _____________.

paraffin oil graphite vegetable oil

63. An insulation resistance test is performed on a particular piece of electric equipment. In addition to the resistance reading, what information listed below should be entered in the electrical log?(a) The maximum allowable operating temperature of the machine.

(a) The temperature of the machine at the time the resistance reading was taken.(b) The normal temperature rise of the machine.(c) The complete name plate data from the resistance test instrument used to obtain the reading.

64. When removing the cap from a sounding tube on a MODU, the sound of air escaping indicates.

a. the tank is full

b. the tank may be partially floodedc. the tank level has droppedd. the tank is completely flooded

65. A solid stream of water might be useful in fighting a burning oil fire on deck when it is used ____________.

a. to wash burning oil over the sideb. to provide cooling for the fire fightersc. in conjunction with chemical foamd. to cool the main deck

66. The burner assembly on an automatically fired auxiliary boiler fitted with variable capacity, pressure atomizing burners, maintains steam pressure by

(a) cycling on and off

(b) changing fuel oil return pressure(c) changing the speed of a rotary cup(d) Varying air pressure supplied to the nozzle

67. Galvanic action which of the following is false.

A. only one metal does not initiate corrosion

B. Two metal with electrolyte will not initiate corrosion

68. In Stern tube, aft of FOREWARD SEAL is leaking then

A. forward tank oil level increase

B. drop in header tank level

69. While starting a hydraulic anchor windlass, you observe that hydraulic pressure does not develop in spite of the proper operation of the electric drive motor. Which of the following actions should you take FIRST to restore pressure?

Make certain that the hydraulic reservoir is filled to the proper level. Inspect the disc brake on the electric motor for proper operation. Check the electric motor for an open overload relay contact. Check for full voltage supply to the electric motor.

70. A primary element used with flow measurement devices highly suitable for liquids containing solids in suspension, is a ____________.

a. concentric orificeb. convergent nozzle

c. venturi tubed. pilot tube

72. Prior to major overhaul of main engine onboard, the engine room crane is tested by

A. Operating the crane through the normal range

B. Testing of the crane with two sample ???abnormal??? conditions

C. Inspection of the crane hook and other safety arrangements

D. Stress testing of crane wire with peak loads

73. Water carryover from boiler onboard through the steam causes

A. Erosion of the steam plant machinery

B. Low water level inside the boiler

C. Build-up of deposits on the steam plant machinery


74. A diffuser is provided at the end of a mechanical atomizer in boiler onboard

A. To prevent blow back of the flame

B. To mix the air and fuel properly

C. To prevent blow out of the flame

D. To eject the excess fumes from the atomizer

75. Short cycling of a fridge compressor can occur in which of the following cases?

A. Air ingress into the system

B. A leaking solenoid valve

C. High cooling water temperature going to the condenser

D. Excessive refrigerant charge

76. Steam stop valve is eased of its seat during boiler start up from cold

A. To allow thermal expansion of parts

B. To allow steam flow during start up

C. To prevent water hammer

D. All of the above

77. Duty of standby person at the entrance of the enclosed compartment during enclosed space entry is

A. To alert others in case of untoward emergency

B. To provide first aid to injured person

C. To assist for the work carried out in the enclosed compartment

D. All of the above.

78. Which of the following statements about the design of D- type boilers, is false?

A. The heavier water in top drum flows back to the bottom drum through the down- comers outside the furnace

B. Inside the furnace the water is heated up in the risers

C. The upper drum is the steam/water drum and the lower one is the water drum.

D. The feed water is pumped into the lower drum

79. If the watch keeping engineer encounters a Main Engine Slow down alarm he should__

A. Immediately cancel the slowdown in the control panel

B. If navigation circumstances permit, after consulting chief engineer he should tell bridge to stop engine ,investigate the fault ,rectify it in consultation with senior engineers and then prepare for restarting the engine

C. He should raise engineer's alarm and wait for all engineers to reach the engine room

D. He need not take any action and wait for the alarm to resolve on its own and then cancel the slow down

80. Which of the following types of coatings used in tanks of a chemical carrier provides a comprehensive protection against most solvents?

A. Epoxy coatings

B. Polyurethane coatings

C. Zinc silicate

D. Phenolic resins

81. Presence of catalytic fines in fuel oil is significant to engineers on board because_

A. Catalytic fines tend to impair proper operation of purifiers

B. Catalytic fines lead to abrasive wear in liners, piston rings and fuel injection equipment

C. Catalytic fines necessitate increase in injection temperature

D. Catalytic fines necessitate increase in storage temperature

82. A partial opening of which of the following kinds of valves can lead to wire -drawing of its seat?

A. Globe Valve

B. Butterfly valve

C. Gate Valve

D. Full bore angle valve

83. Which of the following types of steam traps uses the pressure energy of the steam to close the outlet ?

A. Thermostatic trap

B. Thermodynamic trap

C. Mechanical trap

D. Vacuum trap

84. Sequential starting of machineries after black out in engine room is necessary

A. To prevent overload of Generators

B. To quickly restore the failed power supply in order

C. To prevent damage to machinery which has been switched off

D. All of the above

85. Salinity of distilled water produced from fresh water generator onboard depends on

A. Amount of feed set in fresh water production

B. Amount of salt water leaking from condenser if any

C. Temperature of the sea water used

D. Efficiency of brine ejector from the evaporator shell

86. Which of the following is the material used for manufacturing tube plates of a shell and tube type heat exchanger?

A. Cupro-nickel

B. Aluminum Brass

C. Admiralty Brass

D. Gunmetal

87. How is the water circulated between water and steam drums in a water tube D- type boiler?

A. By the boiler feed water pump

B. By a circulating pump outside the boiler

C. Due to difference in densities of water and steam


88. The seating material for perfectly sealing type Ball valves is usually made up of

A. Rubber

B. PTFE or Nylon

C. Rubber reinforced with steel wire

D. Stainless steel

89. Air is removed from refrigeration system by (1) ________ at receiver after (2) ________ (3) ___ Gas in receiver.

1. PURGING 2.COLLECTING. 3. CONDENSATING

90. Water leaking from a pump packing gland is kept away from the bearing housing by the use of

shaft sleeves lantern rings

water flinger water seals

SECTION 4

TAKEN FROM DG SHIPPING OLD QUESTION

1. Which of the following conditions should be used to support the need to change the lube oil when there has been an increase in the neutralization number?

A decrease in the viscosity of the oil An increase in the viscosity of the oil A change in the cloud point A change in the floc point

2. A casing drain is provided for axial piston and bent axis variable stroke pumps to ___________.

vent off any accumulated air from the system drain off any accumulated water from the pump casing prior to its being started assist the complete removal of hydraulic oil from the system prior to opening for major or

minor repairs prevent damage due to agitation and overheating of oil accumulated in the casing

as a result of minor internal leakage

3. Increasing the speed of a rotary pump above its rated speed will result in most of the following conditions to occur?188

Increased suction Increased clearances Vibrations slippage

4. After packing is added to the stern tube stuffing box, which of the following procedures should be observed to insure even tightening of the gland?193

Listen for a smooth, regular sound. Measure the distance between the gland and the stuffing box with a rule. Judge by feeling the gland for an increase in heat as it is being tightened up. Open the drain connection to allow seawater to flow in and make the distance even.

5. The temperature at which water vapor in the atmosphere begins to condense is called the ____________.

dew point temperature condensation temperature psychometric temperature absolute humidity temperature

6. One function of the air receiver in a compressed air system is to _____________. dry the air discharged from the intercooler minimize the system's line pulsations receive exhaust air from pneumatic accessories remove all traces of oil from the air

7. Which of the following statements describes the purpose of the split inflatable seal installed aft of the primary seal assembly for the propeller shaft?197

To serve as a seal when adding packing to the stuffing box. To allow repair or replacement of the primary seal elements when the ship is

waterborne. To eliminate leakage via the propeller shaft when the shaft is not rotating. To provide a ready means for the entry of cooling water.

8. Why should a person performing maintenance on an air compressor wire and tag the system valves closed?

To prevent the unexpected. To protect the equipment. To protect the operator performing the maintenance. Each of the above is correct.

9. One of the main differences between the various types of screw pumps is in the __________.

stuffing box diameter direction of rotation of the screws pitch of the screws type of driving gears

10.The FIRST thing to do to ensure that a refrigeration unit will not start while undergoing repairs, is to ____________.

secure and tag the electrical circuit place a crow bar in the flywheel of the unit inform all persons in the area not to start the unit make a log book entry

11.At which of the following locations would a duplex pressure gage most likely be located?

Fuel oil service pump discharge flange Fuel oil strainer Fuel oil heater Fuel oil flow meter

12.In any air system a safety device should be placed between any two points where air can be trapped between any two valves.(a) Which can be closed manually.(b) Between a non –return valve and a screw down valve.(c) Between a non-return valve and a U-bend of a pipe.(d) Between any valve and a nozzle.

13.Some of the following are preferred refrigerants of the future(a) Carbon dioxide

(b) Refrigerant 11

(a) Refrigerant 502(b) Ammonia(c) Bromine(d) Argon

14.In the air conditioning of a ship a “Comfort Zone” constitutes(a) Low humidity, low room temperature(b) Low humidity, moderate temperature(c) High humidity, moderate temperature(d) Very low temperature, moderate humidity

15.The passenger spaces of a passenger ship is protected against major fires by a (a) High expansion foam system(b) High density CO2 system(c) By a mixture of fire detection, fire retardant, ‘A-1 class bulkhead, fire doors, fire

insulation and elaborate sprinkler system.(d) High pressure steam system.

16.Sand impregnated with chemicals is kept in metal containers with a shovel, in the engine room, for the following purposes(a) to cover small oil spills(b) to use along with cement for doing repair jobs.(c) for making the floor anti-skid by giving more friction.(d) for use as grinding paste in case of emergency.

17.Which of the processes listed, consumes the greatest amount of power while producing the greatest amount of heat?

Overcoming sliding friction Overcoming rolling friction Overcoming fluid friction Overcoming oil wedge friction

18.Which of the following guidelines is considered to reflect good design practices of shipboard steam heating systems?

Provide constant steam service for equipment operating throughout the year. Provide either a common or individual reducing station for each group of units requiring the

same operating pressure. Run all piping so it may be drained by gravity. All of the above.

19.A distinguishing feature of an eductor, when compared to other pumps, is the ______________.

discharge end being smaller than the suction end small size of impeller lack of moving parts ease at which the wearing rings may be changed

20.When securing a flash-type evaporator for an extended period of time, you should _____________.

fill the unit with saltwater fill the unit with descaling compound completely drain the unit

tightly seal the unit to exclude air

21.The portion of a hydraulic hose that determines its overall strength, is the _____________.

inner tube braided inner layer(s) outer cover outer armor

22.Which features of a centrifugal pump reduce the need for renewing worn impellers and pump casings?

Close radial clearance between impeller hub and casing Low rotational speed of impeller Removable end plate Replaceable impeller and casing wearing rings

23.An acceptable method of dealing with accumulated oil found in the pump room bilges is to ______________. transfer the oil to the sea chest pump the oil into the slop tanks discharge the oil over the side on an outgoing tide pump the oil into a clean ballast tank

24.A ship is required to carry an Oil Record Book, and must maintain the book as per rules on board for _______________.

1. one year2. two years3. three years4. four years

25.Which of the following actions, pertaining to saltwater lubricated stern tube stuffing boxes, is usually observed when the ship is expected to be in port for an extended period?

The stuffing box is continually flushed. The drain connection is left opened. The stuffing box gland is tightened. The packing is adjusted for greater cooling or replaced.

SECTION 5

1. A high pressure differential in a main engine fuel oil filter onboard can be best reduced by

A. Back flushing the filter manually

B. Stopping the main engine to change the filter element

C. Changing over to stand by filter if provided

D. None of the Above

2. Inert Gas System should be capable of delivering Inert Gas at the rate of at least____________________________

A. 110% of the maximum rate of cargo discharge capacity of the ship

B. 133.33% of the maximum rate of cargo discharge capacity of the ship

C. 125% of the maximum rate of cargo discharge capacity of the ship

D. 90% of the maximum rate of cargo discharge capacity of the ship

3. The static positive suction head of a pump is the

A. distance of the suction liquid level above the center line of the pump

B. distance the suction liquid level is below the center line of the pumps

C. force necessary to overcome frictional losses in the pump and piping

D. amount in inches of mercury the total suction head is below atmospheric pressure

4. When overhauling engines in bad weather onboard

A. Use additional lifting equipments

B. Use heaving line to prevent moving of item

C. Use chain block if required to restrain moving of parts


5. Two compressors should not be run in parallel because

A. It is not efficient to run two compressors

B. It will give over capacity in the system

C. There is possibility of losing oil from the compressors

D. A and B ans c only

6. The term referring to the number of teeth per inch on a hacksaw blade is known as the

A. Set

B. rake

C. pitch

D. thread gauge

7. The ash content of a fuel oil is significant to the operating engineer because it 117

A. is an indication of the amount of noncombustible material present in the oil

B. indicates the quantity of energy released by burning a unit amount of the fuel

C. is useful for determining proper atomization temperatures

D. reflects the overall thermal efficiency of the fuel oil service system

8. Air conditioning system air handling units must have their air filters cleaned at regular intervals in order to prevent______

A. Growth of micro-organisms and bacteria harmful to human beings

B. Restriction to air flow and hence reduced efficiency of the plant

C. Growth of mites and other allergens

D. All of the above

9. Amount of distilled water produced in fresh water generator onboard decreases with

A. Increase in vacuum in the fresh water generator shell

B. Decrease in sea water temperature

C. Decrease in efficiency of heat exchanger

D. Increase in sea water temperature

10. Before any work is to be carried out on a burner in an automatically fired auxiliary boiler, you should always (multi a c d)

A. block all control system relays closed

B. allow the boiler to cool completely

C. close all manually operated fuel valves

D. lock all safety interlock switches closed

11. Soot blowing of boilers onboard can be carried during

A. Port operations

B. Sailing

C. During indications of a uptake fire

D. Inerting operations in oil tankers

12. Which of the following components in an Inert Gas system ensures that vapours are vented well clear of the working deck? i) High velocity vents ii) Mast risers

A. Only i)

B. Only ii)

C. Both i) and ii)

D. Neither I) nor ii)

13. Which of the following is most suited to act as a deck air compressor?

A. Lobe type

B. Reciprocating type

C. Screw type


14. Safety of Gas cylinders used for cutting and welding is ensured

A. By fitting of flash back arrestor

B. By using color codes for gas pipe connections

C. By using trolley???s when transferring cylinders

D. All of the above.

15. Pumps impart energy to a fluid but the energy required to bring the fluid to the pump may be provided by________________

A. Gravitational Head

B. Atmospheric pressure

C. Another pump

D. Any one or a combination of above

16. Injecting water into the combustion chamber of marine engines is a primary method of reduction of which of the following air pollutants?

A. SOx

B. Particulate matters

C. Unburnt Hydrocarbons

D. NOx

17. In case of failure of control air supply, some valves continue locked in the position they were at the time of failure. They are said to be-

A. Fail-safe

B. Fail -proof

C. Fail-set

D. Fail -blocked

18. Old machinery space log book are kept in safe custody

A. To refer and clarify in case of any query

B. For purpose of internal and external audits

C. To safeguard the chief engineer???s competence


19. If the superheat value of a thermostatic expansion valve is set too low________

A. The suction line of the compressor will be too hot

B. The suction line of the compressor will be too cold

C. The discharge line of the compressor will be too hot

D. The discharge line of the compressor will be too cold

20. Which of the following chemical compounds prevents caking of powder in dry chemical powder fire extinguisher?

A. Sodium Stearate

B. Sodium Bicarbonate

C. Magnesium Stearate

D. Magnesium Bicarbonate

21. The primary advantage of a central cooling system is______________________

A. A more simplified cooling circuit.

B. Most part of the cooling system being fresh water based,corrosion is minimized

C. It allows better control of temperatures by using fewer controllers

D. All of the above

22. Refractory damage in boiler furnace onboard is caused due to

A. Presence of moisture in the boiler before startup

B. Rapidly fluctuating temperatures inside boiler furnace

C. Overheating of boiler tubes due to lack of heat transfer from tubes due to scale

D. Boiler panting and vibrations

23. Which of the listed conditions can lead to cavitation in a centrifugal pump?

A. Vapor pockets formed in the suction flow stream

B. Rough casing volute surfaces

C. Worn wearing rings

D. Heavy fluid in the flow stream

24. A major controlling factor in the location of the condensate return piping from a heating system is/are 169

A. the requirement for a gravity return

B. the requirement for short laterals run

C. the requirement to minimize conflict with headroom and other services

D. all of the above

25. To maximize the effectiveness of soot blowing onboard

A. Ensure Boiler is firing at high load

B. Ensure Boiler is firing at low load

C. Ensure combustion parameters maintained normal


26. Isolation of filters onboard prior to cleaning is done by

A. Closing of inlet and out let valves

B. Switching of the relevant pump and system valves

C. Opening of drains and vent valves

D. All of the above

27. Which of the following type of pumps is most suited to act as Waste Oil Sludge Pump?

A. Centrifugal pump

B. Screw pump

C. Gear Pump

D. Progressive cavity pump

28. In the Alcap principle of centrifugal separation______________________

A. Water is only discharged when desludgeing is activated by the control unit

B. The valve at the water outlet is opened periodically based on timer action

C. The valve at the water outlet is opened on the basis of signal of water content to the control unit from the water transducer at the clean oil outlet

D. The centrifuge works as a clarifier with no water outlet

29. High pressure cut out of a refrigerant system can activate due to which of the following faults?

A. Improper cooling due to a dirty condenser

B. Overcharge

C. Air in the system

D. All of the above

30. To prevent electric shock during electric arc welding multi

A. Wear dry clothes

B. Wear insulated shoes

C. Keep first aid equipment ready


31. A record of the types and strengths of steels used on a MODU must be included in the

A. General plans

B. Builder's documentation

C. Certificate of Inspection

D. Construction portfolio

32. Water hammer in a steam heating system can be caused by

A. filling the auxiliary boiler with cold water

B. steam admitted to a cold pipe

C. filling the auxiliary boiler with hot water

D. draining a soot blower line before cracking the steam supply valve

33. What is a function of the wearing rings used in most centrifugal pumps?

A. Absorb erosion of high velocity discharge stream

B. Seal pump shaft against entry of air

C. Isolate the discharge side from the suction side

D. Dampen the turbulent discharge flow

34. Which combination of the main shaft segments listed below, that are located furthest from the main engine, are connected by the inboard stern tube shaft coupling?

A. Line shaft and thrust shaft

B. Line shaft and stern-tube shaft

C. Thrust shaft and stern-tube shaft

D. Stern-tube shaft and tail shaft

35. An auxiliary engine turbo-charger makes strang0e noises when the load changes. The engine parameters however are absolutely fine. An external examination of turbocharger parameters as stated in the manual also reveals nothing. Would you

(a) Continue to run the engine and wait for some time

(b) Stop the engine for a while and make some checks

(c) Reduce the load of the engine

(d) Run it on steady load to make some checks.

36. Which of the following can be done to reduce the cold corrosion of Main Engine cylinder liners using high sulphur fuel oil :-

A. Increasing cylinder oil feed rate

B. Using high TBN cylinder oil

C. Increasing scavenge air temperature

D. Decreasing cylinder oil feed rate

37. Which of the following can lead to premature failure of roller bearings?

A. Misalignment

B. Contamination

C. Shrinkage

D. Over greasing

38. WHICH PROCESS IS NOT DONE ON MILD STEEL?

A. Hot plating

B. Electrolysis

C. Explosion bonding

D. Metal spraying

39. Boiler not starting in 2 -3 times, what we do,

A. check fuel ignition system,

B. check fuel burning system

C. check furnace

D. all of the above

40. Sewage Plant Efficiency is gauged by

a) Suspended Solid

b)Coli count

c)Biological Oxygen Demand(BOD)

d)All

41. When oil carried over in steam drum

A. overheating of tubes,

B. corrosion of tubes

C. density of water is reduced

D. all of the above

42. Steam drum is used for

A. collecting of steam

B. collecting of water

C. equalising water in the tubes

D. collecting of precipitated salts of water

43. Steam drains should be

A. drained by gravity

B. short lateral length

C. should cover less head space

D. all of the above

44. Which of the group of method are used for priming of centrifugal pumps onboard ships?

A. Gravity tank, attached vacuum pump

B. Attached Vacuum pump, filling pump casing using a fresh water hose

C. Central priming system, attached vacuum pump, sea water priming


45. The crank web deflection readings of a diesel engine would be erroneous in which of the following conditions?

A. When the draught of the vessel has changed while readings were being taken

B. When cargo loading and discharging has been too rapid

C. When the crankcase temperature has changed substantially during the process of taking the readings.


46. Which of the following will be required to be done in order to reduce sulphur corrosion of Main Engine Components?

A. Increasing the atomization pressure of fuel injectors

B. Fitting exhaust valves with valve rotators

C. Running engine at or near normal sea load

D. Decreasing the F.O. purifier feed rate, running two purifier in series one acting as purifier and other as clarifier

47. Vacuum priming pumps which work on the principle of fixed vane pumps require ________ for___________ clearance between vane tips and casing.

A. Lube oil, lubricating

B. Lube oil, sealing

C. Water, sealing

D. Gland packing, sealing

48. The common term used for failure of metal and alloys in a corrosive environment, when subject to high stresses is known as :

A. Fatigue failure

B. Corrosion fatigue

C. Stress corrosion cracking

D. Fretting Corrosion

49. about emergency fire pump...?

A) Out of engine room

b) Self priming

c) Power should be outside e/r

d) All the above

50. Double entry impellers have a distinct advantage over single entry impeller. What is it?

A. They balance out the axial thrust

B. It gives a higher pumping efficiency

C0. It is cheaper and easier to manufacture

D. The need of installing line bearing onto the pump shaft is eliminated

51. A refrigerant compressor will run continuously when there is

A. Too heavy cooling load on the systemB. Air in the systemC. Insufficient refrigerant in the system

D. Any of the above

52. Cause why cascade tank water temperature is high? OR What could be the reason why the feed pump can hardly pump in water to the auxiliary boiler causing the cascade tank water level to rise & temperature too high?

A. High ambient temperature

B. Clogged condenser water tubesC. Filter dirtyD. Low cascade water level

53. Where is the location of the backfire valve?

A. Boiler furnace

B. Scavenging area

C. Gas cylinder

54. During departure from a 2 weeks anchorage, the reason why the windlass cannot lift the anchor up is

A. Low lube oil tank levelB. Windlass defective by pass valve

C. Anchor drag sunken objectD. Too cold hydraulic oil

55. A ballast pump is being used to de-ballast a fore peak tank which is full. It is seen that suction pressure is positive and discharge pressure is very low compared to rated discharge head. It indicates that:

A. Pump is not operating satisfactorily and pumping capacity is too low

B. Pump is not operating satisfactorily and pumping capacity is higher than rated, throttling of discharge valve is required

C. Pumping capacity is not affected by suction and discharge pressures

D. Pump is operating normally

56. What attachment can you find in air reservoir?

I – Safety/Relief valveII – Fusible plugIII – Bursting disc

57. Cavitation erosion occurs due to

A. Chemical action

B. Physical action

C. Chemical OR physical action

D. Combination of chemical or physical action

58. The lowest temperature at which a liquid as listed on the MSDS, gives off enough vapor to ignite in the presence of an ignition source is called its _______.

A. Flash point

B. Fire point

C. Ignition point

D. None

59. Boiler secondary drum pressure ............than primary drum pressure

A. Less

B. More than

C. Equal

61. When main engine is running in emergency condition which of the alarm can’t be bypassed.

A. LO low pressure

B. JCW high temp

C. Piston cooling water high temp

D. All

55.Why we do not prefer to run air two compressor together because

A. All below points

B. Too much maintenance

C. Too much power consumption

D. Loss of lube oil

SECTION 6

JANUARY 2013

1. The master or person in charge of a MODU is required to log

A. the date and hour of each fire drill

B. the names of all persons on board

C. only casualties which occur while underway

D. every event occurring on board

2. A simultaneous rise in stern tube forward seal tank and drop in level of header tank indicates_

A. Aft seal ring of forward seal assembly damaged or sealing disturbed by foreign object

B. Forward seal ring of forward seal assembly damaged or sealing disturbed by foreign object.

C. Either of the above


3. Bearing damage in a diesel engine onboard is indicated by

A. White metal in the crankcase

B. White metal in the lube oil filter

C. Knocking sound from the engine crankcase

D. Any of the above

4. In a D- type water tube boiler with a secondary steam drum and super- heater, the steam is heated above the boiling point of water in the _______

A. Primary steam drum

B. Risers

C. Super- heater

D. Secondary steam drum

5. Which of the following statements is false about corrosion due to galvanic action?

A. Metals close to the anodic end of galvanic series corrode in preference to the ones close to the cathodic end.

B. When any single metal exists in a system, it cannot corrode due to galvanic action.

C. Zinc is anodic to steel and is often used as a protective coating

D. Corrosion rate is affected by temperature

6. Which of the following statements is FALSE regarding gas carriers?

A. Shipboard generation of inert gas for cargo tanks is a requirement .

B. Shipboard generation of inert gas for inter tank barriers and holds is a requirement.

C. Gas carriers do not use ship's main boilers for generation of inert gas.

D. Gaseous nitrogen is produced on board in many gas carriers

7. Which of the following factors will have the greatest effect on the heating load within a conditioned space?

A. Solar gain

B. Infiltration and ventilation air

C. Occupants inside the space

D. Entertainment equipment within the space

8. During major repair work in enclosed space onboard

A. Keep log of entry and exit time of personnel

B. Keep adequate first aid equipment at the entrance

C. Provide refreshments


9. Before the longitudinal carriage feed of a lathe is engaged, you must be certain the

A. spindle clutch is disengaged

B. carriage clamp screw is loosened

C. carriage stop clamp is tightened

D. thread dial indicator is zeroed

12.In a compression type grease cup, the lubricant is forced into the bearing by

A. gravity flow

B. spring force

C. a pressure gun

D. a zerk fitting

13. Type of the tank is fitted semi and fully pressurized gas carrier

A. Type a

B. Type b

C. Type a and b

D. None

14. Surging indicates

A. Scavenge fire

B. exhaust manifold fire

C. Fault in fuel system

D. All

15. Engine cylinder relief valve lift indicates abnormal of what.

A. Fuel supply

B. Fuel injection

C. Exhaust temp

D. Exhaust pressure

16. Hydride formation in gas carrier can lead to a

A. Contamination of cargo

B. Seize of pump

C. Exothermic reason

D. None

17. Deep well cargo pump used in

A. Chemical carrier

B. Product carrier

C. LNG

D. All

SECTION NEW – 1(READ)

1. Which of the following statement is true if the oil temperature is allowed to become excessively high in the heaters?

A. Excessive temperature will increase oil viscosity that results to poor combustion

B. Excessive temperature will cause the oil to crystallize resulting in pulsating fires

C. The fuel will carbonize and its heating ability will be reduced

D. The fuel will ignite even it has not reached point of ignition

2. A drop in compression pressure in one cylinder of a diesel engine can be caused by ___________.

a. only fuel injection

b. burned valves

c. too late fuel injection

d. low fuel penetration

3. Some diesel engines are fitted with a thermometer in the cooling water outlet from each cylinder. If the cooling temperature from an individual cylinder begins to rise, what should you suspect?

a. That there is an overloading of cylinder

b. That there is an overloading of the adjacent

cylinder

c. That there is an increase blow-by of the cylinders

d. That there is an incomplete combustion in that cylinder

4.Which of the listed actions should be carried out if a ship is to be laid up for an indefinite period of time ______.

I – Boilers to be laid up wet should be completely filled

II – All fuel tanks should be cleaned & gas freed

III – All potable water tanks should be cleaned & disinfected

A. I only

B. II only

C. I & II

D. I, II & III

5.Adding trisodium phosphate in boiler water will _______.

I – Decrease salinity

II – Increase salinity

III – Decrease alkalinity

A. I only

B. II only

C. I & II

D. I, II & III

6. A shortage of refrigerant in the refrigeration system is indicated by ___________.

a. the compressor short cycling

b. high head pressure

c. high suction pressure

d. bubbles in the sight glass

7. Directional control v/v used in hydraulic p/p is controlled

a)manually

b)mechanically

c)electrically

d) all

8.Electric and electro-hydraulic steering gear motors are required by Coast Guard Regulations (46 CFR) to be _________.

A. protected by a circuit breaker set at 125% and a thermal overload device

B. provided with a running motor overcurrent protection device

C. served by a single two conductor cable

D. served by two feeder circuits

9.Dezincification of brasses may be prevented by introducing which of the following additives during manufacturing brass?

A. 0.04% Nickel

B. 0.04% Cobalt

C. 0.04%Arsenic

D. 0.04%Tungsten

10.One cause of leaky valves in a low pressure air compressor may be attributed to

A. running with an air filter element different from that required by the original manufacturer's specifications

B. excessive operating hours without carrying out preventive maintenance

C. the compressor running too fast

D. excessive discharge pressure

11.The static suction lift of a pump is the difference in elevation between the

A. centerline of the pump and the level of the liquid in the suction well when the source of liquid is below the pump

B. centerline of the pump and the suction liquid level when

the source of liquid is above the pump

C. centerline of the pump and the level of the discharge liquid

D. liquid levels of the suction and discharge

12. Plate type heat exchangers are preferred over shell and tube type ones because____________

A. They can be cleaned more thoroughly .

B. Their capacity can be altered by adding or removing plates.

C. Turbulent flow and more margin for increased fluid velocity ensures less deposits and hence longer time interval between cleanings.

D. All of the above

13. Inert Gas System should be capable of delivering Inert Gas at the rate of at east_________________

A. 110% of the maximum rate of cargo discharge capacity of the ship

B. 133.33% of the maximum rate of cargo discharge capacity of the ship

C. 125% of the maximum rate of cargo discharge capacity of the ship

D. 90% of the maximum rate of cargo discharge capacity of the ship

14. Pre-ferential tripping of electrical machineries prevents

A. Overloading of generators

B. Black out in engine room

C. Allows starting of large machineries


15. Which is the only gas product, allowed by gas codes, to be burnt in ship's boilers?

A. LPG

B. Ethylene

C. Butane

D. LNG

16. Frequent cutting- in & cutting -out of a fresh water pump on a hydrophone system indicates which of the following?

A. Nothing abnormal

B. Excessive air charge

C. Insufficient air charge

D. The differential setting between cut-in and cut out is too low

17. Economisers are built up with

A. Copper tubes

B. Plain steel tubes

C. Stainless steel tubes

D. Steel tubes fitted with shrunk on C.I. grills single d

18..You must have worked with mooring winch and windlass hydraulic systems. The cooling of hydraulic oil for the above system on large merchant ships is provided by:

A. There is no cooling arrangement as the system doesn???t require cooling

B. Air cooled hydraulic reservoir

C. Water cooled plate or shell type heat exchangers

D. Radiator and fan arrangement

19.In case of failure of the control system of a centrifuge,the correct sequence for manually de-sludging a purifier would be-

A. Stop feed-give sealing water-close sealing water -shut operating water-open and close desludging water quickly

B. Stop feed- shut operating water-open and close de-sludging water quickly

C. Shut operating water-stop feed- open sealing water for a short time then close-open and close de-sludging water quickly.

D. Shut operating water- stop feed- open and close desludging water quickly

20. Liquid ring primer used for priming main and emergency fire pumps onboard

A.Is to be filled with water in the water tank to maintain water level

B.Is to be capable of automatic engagement and disengagement with drive shaft

C.Is to have sufficient capacity to exhaust air out from pump in all sea conditions

D.All of the above.

21.To prevent electric shock during electric arc welding

A.Wear dry clothes

B.Wear insulated shoes

C.Keep first aid equipment ready

D.None of the above

22. Back pressure valve in a refrigeration system with multiple chambers is fitted_____________

A. At the refrigerant exit end of evaporator of each chamber

B. At the refrigerant exit end of evaporators of chambers with higher temperature settings

C .At the refrigerant exit end of evaporators of chambers with lower temperature settings

D .None of the above

23.Inert Gas System on board tankers is used during which of the following operations-

A. Inerting of empty tanks

B. Inerting during crude oil washing

C. Purging before gas freeing

D.All of the above

24.To prevent main engine stoppage during periods of bad weather

A .Ensure lube oil level is topped up

B. Ensure over speed trip override switch set up to rough sea setting

C .Ensure reduced speed setting to prevent overload

D. All of the above

23.Subsequent to a oil spill in Engine Room and ingress of oil in the bilge wells ,the best course of action is to _______________________________

A .Use oil spill dispersant chemical in the bilge wells

B. Transfer the oily mixture and let it settle in the bilge holding tank/bilge separator tank

C .Transfer the oily mixture using a portable pneumatic pump to a waste oil tank and then physically de-muck and clean the bilge wells using environment friendly cleaner

D. Dilute the bilge wells by flooding with water and then use the general service pump to pump out the bilges

24.Amount of distilled water produced in fresh water generator onboard decreases with

A.Increase in vacuum in the fresh water generator shell

B.Decrease in sea water temperature

C.Decrease in efficiency of heat exchanger

D.Increase in sea water temperature

1.In case of an exhaust gas boiler fire ,which of the following is a suitable control measure?

A. Start frequent soot blowing

B. Increase main engine speed to blow away the soot particles on fire

C. Stop cooling water circulation to avoid leakage


3.Refractory damage in boiler furnace onboard is caused due to

A. Presence of moisture in the boiler before startup

B. Rapidly fluctuating temperatures inside boiler furnace

C. Overheating of boiler tubes due to lack of heat transfer from tubes due to scale

D. Boiler panting and vibrations

4.An economizer uptake fire in the engine room is extinguished by

A. Boundary cooling of the uptake

B. Injecting fixed fire fighting system if provided

C. Injecting water from the uptake


LNG STORAGE AND PUMPING DETERMINED BY WHAT PROPERTY

a. VAPR PR

b. PARTIAL VPR PR

1. Which of the refrigerants listed is considered safe and ideal for most marine applications?-R-21-ammonia-R-12-sulfur dioxide ans c n its r 22

2. In reference to air conditioning, when air attains the maximum amount of moisture it can hold at a specific temperature, it is said to be__________-superheated-saturated-condensed-convected

3. Which of the following terms represents the form of heat removed from the refrigerant in the condenser of a refrigeration system?-latent heat of vaporization -heat of compression-superheat-all of the above

4. The temperature at which water vapor in the atmosphere begins to condense is called the_______-dew point temperature-condensation temperature-psychrometric temperature-absolute humidity temperature

5. In a refrigeration system, the refrigerant absorbs the latent heat of vaporization in the______-compressor-condenser-receiver-evaporator

6. The only means of removing the latent heat of condensation from a refrigerant in the normal refrigeration cycle is by-passing it through the expansion valve-condensing refrigerant in the system condenser-passing the gaseous refrigerant through the heat interchanger on the suction side of the compressor-maintaining a high pressure on the system's receiver

7. The heat required to change a substance from a solid to a liquid while at its freezing temperature, is known as the latent heat of-fusion-vaporization-condensation-sublimation

8. The heat required to change a substance from a liquid to a gas without experiencing a temperature change, is defined as the latent heat of-fusion-vaporization-sublimation-condensation

9. Heat which brings about a change in the physical state of a substance without a change in temperature, is called-specific heat-sensible heat-latent heat-ambient heat

10. Latent heat can be defined as the heat which must be added to a substance in order to change it from a-solid to liquid-liquid to vapor-solid to vapor-all of the above

11. Personnel working with refrigeration systems, and subject to the exposure of refrigerants should wear-face shield-a respirator-rubber gloves-an all purpose gas mask

12. The amount of moisture in a given sample of air, when compared with the amount of moisture the air could hold if totally saturated at the existing temperature of the sample, is called-absolute humidity-specific humidity-effective humidity-relative humidity

13. The ratio of the weight of moisture contained in a given volume of air, to the weight of moisture that the same sample would hold if saturated, is called the-absolute humidity-relative humidity-specific humidity-total humidity

14. The moisture sensitive element of a humidistat can be made of-hair-copper-plastic-steel

15. When handling contaminated oil from a hermetically sealed refrigeration compressor unit that has burned out its motor, you shoulda.store the oil in a clean refrigerant drumb.use rubber glovesc.circulate the oil through a filter drierd.remove the oil with a portable charging cylinder

16. When replacing ball bearings on an electric motor shaft, you should-tap the outer race with a mallet-apply even pressure to the outer race-apply even force to the inner race-apply pressure evenly to both the inner and outer races

17. People familiar with ammonia refrigeration systems become accustomed to its odor and may forget that the vapors-in a low concentration can cause death-will dissolve in pespiration and cause caustic burns-will burn or explode-all of the above

18. Ammonia when used as a refrigerant is valuable because of its high efficiency, it is however-toxic-flammable-explosive-all of the above

19. When subjected to high heat from an open flame, or an electric heating element, which of the listed refrigerants will break down and produce phosgene gas?-CO2-methyl chloride-R-22-sulfur dioxide

20. When the relief valve opens it discharges high pressure refrigerant vapor to the-liquid strainer-refrigerant inlet of the condenser-inlet side of the evaporator-suction side of the compressor

21. In the presence of an open flame or hot surfaces, chlorinated fluoro carbon refrigerants decomposes and form-petroleum crystals-phosgene gas-water vapor-carbon monoxide

22. R-12 is generally considered to be a safe, nontoxic, nonflammable, and non-explosive refrigerant. It can, however, become highly toxic when-superheated outside the system-in contact with an open flame-heated to the boiling point-all of the above

23. A refrigeration system contaminated with moisture can be affected byA.acid formationb.sludge formationc.ice in the expansion valved.all of the above

24. Some chloronated flourocarbon refrigerants may decompose into a toxic irritating gas if it is-stored at temperatures below 10C-charged into a system having copper fittings-allowed to mix with compressor oil-exposed to an open flame or hot surfaces

25. For the proper control of the air temperature in an air conditioning system using chilled water circulation, which of the listed conditions should remain constant regardless of load changes?-chilled water system supply temperature-chilled water system return temperature-compressor discharge temperature-compressor suction pressure

26.In a direct expansion type multi-box refrigeration system, the compressor is set up to cycle on and off by the-pressurestat-high pressure cut out-solenoid valve-low pressure cut out switch

27. Which of the listed operations will cause an automatically controlled Refrigeration compressor to restart?-closing of the solenoid valve-closing of the expansion valve-an increase in the suction pressure-decreasing the suction pressure

28. Saltwater is typically provided to a refrigeration system to-cool the expansion valve-prevent refrigerant superheating-condense the refrigerant gas-prevent motor overheating

29. In a direct expansion type cargo refrigeration system, a box is normally changed from chill to freeze by adjusting the-hand expansion valve-compressor suction valve-solenoid bypass-back pressure regulating valve

30. A pressure drop in the liquid line of a refrigeration system may cause-the solenoid valve to seize-the compressor to hunt-flash gas to form in the liquid line-the expansion valve to freeze open

31. Moisture is removed from a refrigeration system by -bleeding refrigerant from the condenser-opening a drain petcock on the oil separator-condensing the water in the heat exchanger-using a dehydrator cartridge

32. Moisture in the refrigerant may -freeze on the expansion valve seat and reduce the flow of liquid refrigerant-emulsify the oil in the condenser-freeze in the king valve-clog the oil trap

33. Moisture entering a typical refrigeration system will most likely-boil in the condenser-be removed by the liquid line strainers-cause sweating and frost on the evaporator coils-freeze in the expansion valve

34. Moisture in a refrigeration system can cause-freezing the expansion valve closed-corrosion of system piping-improper temperature regulation-all of the above

35. Which of the problems listed could be indicated if a sight glass in the refrigerant liquid line is full of bubbles?-proper refrigerant charge-faulty expansion valve-insufficient refrigerant-solenoid valve stuck open

36. Some refrigeration systems have chemical moisture indicators installed in conjunction with the sight glass in the liquid line. If excess moisture is present in the system, the indicator will-activate the driers-change color-secure the compressor-add the predetermined amount of liquid drier

37. A liquid indicator sight glass is useful in determining whether or not a refrigeration system is sufficiently charged. It is generally located in the-high pressure liquid line-low pressure liquid line-high pressure vapor line-low pressure vapor line

38. If a liquid sight flow indicator in a refrigeration system shows gas bubbles in motion passing inside of the glass, there is-too much refrigerant in the system-oil entrained in the refrigerant-less then a full charge of refrigerant in the system-ice crystals forming in the refrigerants 39. A sight glass is installed in the liquid line to indicate the condition of the refrigerant charge and may also indicate the-condition of the expansion valve-moisture in the system-condition of the compressor suction valves-condenser temperature

40. A liquid sight flow indicator in a refrigeration system is examined and gas bubbles are noted in motion with the fluid flow. This means-the system is fully charged-there is air leaking in from the condenser-ice crystals are forming in the refrigerant-the system contains less then a full charge of refrigerant

41. In an operating refrigeration system low on refrigerant, a liquid line sight glass will-be clear-be blue-be light green-show bubbles

42. If the refrigeration compressor crankcase is sweating, the cause may be due to-a shortage of refrigerant-the compressor running continuously-liquid refrigerant returning to the compressor-the compressor short cycling on the high pressure cutout

43. If the suction line between the evaporator and compressor is frosting up, the cause may be due to the thermal expansion valve-thermal bulb coming loose from the suction line-needle valve is stuck closed-thermal bulb is in a cold air stream-all of the above

44. If a refrigerating compressor crankcase is sweating, the trouble could be caused by-excessive superheat-a minor amount of air in the system-normal oil circulation with the refrigerant-the expansion valve being stuck in the open position

45.Frosting or sweating of the suction line of a reciprocating refrigeration compressor indicates a condition which could result in severe damage due to-minor amout of oil in the refrigerant-liquid slugging-insufficient refrigerant-a failed heat interchanger

46. A refrigeration system compressor crankcase is sweating or unusually Cold. This is an indication of-a shortage of refrigerant in the system-air in the system-an accumulation of liquid refrigerant in the crankcase-a shortage of oil in the crankcase

47. Refrigeration system compressor crankcase sweating is an indication of-insufficient lube oil circulating throgh the system-excessive circulation of lube oil through the system-insufficient refrigerant in the system-an overworked compressor

48. Sweating of the refrigeration system compressor crankcase is caused by-too much superheat-insufficient superheat-suction pressure too low-excessive refrigerant returning to the compressor

49. Crankcase sweating in a refrigeration system is caused by-a stuck solenoid valve-a shortage of refrigerant-too much oil in circulation-too much superheat

50. Properties of good refrigeration oil include-low wax content-high pour point-high viscosity-all of the above

51. Oil separators installed in refrigeration systems serve to-remove excess oil from the system-remove oil entrained in high pressure liquid line-return oil entrained in refrigerant vapor back to the compressor crankcase-all of the above

52. An oil separator is a device used to remove oil from the-liquid refrigerant-receiver-gaseous refrigerant-expansion valve

53. The oil separator (trap) used in a shipboard refrigeration system is located between the-compressor discharge valve and the condenser-condenser and the receiver-receiver and the king valve-receiver and the expansion valve

54.The purpose of the refrigeration system low pressure cutout switch is to-protect the compressor from liquid flood back-protect the compressor from low discharge pressure-start and stop the compressor upon system demand-start the compressor after a drop in the evaporator pressure

55. The purpose of the low pressure cutout switch is to-maintain liquid refrigerant at the suction of the compressor-maintain a preset suction pressure to the compressor-start and stop the compressor at preset operating pressures-operate at minimum efficiency

56. The sensing line for the low pressure cut-out switch to a refrigeration system is located-in the chill box-before the receiver-on the suction side of the compressor-on the discharge side of the compressor

57. The refrigeration system low pressure cut-out switch is actuated by-an electric system manager-a sensing bulb at the tail coil of the evaporator-pressure changes in the suction line-failure of the king solenoid valve

58. When you adjust thermostatic expansion valve-refrigerant must be bled off the sensing line before adjustments are made-all refrigerant must be pumped into the receiver before adjustments are made-time must be allowed for conditions to stabilize in the evaporator before further adjustments are made-all refrigerant must be routed through the dehydrator while changing the superheat setting

59. A thermostatic expansion valve is properly controlling evaporator superheat. Adjusting this valve to lower the superheat will result in a/an-evaporator pressure decrease-evaporator coil over-feed-evaporator capacity increase-expansion valve diaphragm rupture

60. Low compressor head pressure in a refrigeration system can be caused by-insufficient condenser cooling water-excessive condenser cooling water

-air in the refrigeration system-excessive refrigerant in the system

61. Which of the problems listed would cause the discharge temperature of an R-12 refrigeration compressor to increase?-thermal expansion valve frozen open-suction gas heat exchanger bypassed-condenser clogged or fouled-high pressure cutout switch inoperative

62. One cause of high head pressure occurring in a refrigeration system can be-insufficient cooling water flow to the condenser-a low refrigerant charge in the system-the liquid valve is open too much-high evaporator superheat

63. If the head pressure of a reciprocating refrigeration compressor is excessive,-the relief valve should open before the high pressure cutout-the relief valve should open and allow the excess refrigerant to flow to the receiver-the high pressure cutout switch should operate before the relief valve opens-you should close in on a suction valve

64. If the refrigeration compressor was developing higher than normal discharge pressure, this could be a result of-air or non-condensable gases in the system-leaking discharge valves-leaking suction valves-liquid refrigerant flooding back from the cooling coil

65. If the water failure switch should fail to shut down the refrigeration compressor, the refrigerant pressure will build up in the high pressure side of the system to the point where the-compressor discharge valves would be damaged-condenser tubes would rupture-system relief valve would open-high pressure cutout switch would function

66. High suction pressure to a refrigeration system compressor is caused by-the expansion valve is insufficiently opened-the expansion valve being open too wide-the king valve is insufficiently open-a dirty dehydrator

67. If a refrigeration compressor had developed a high suction pressure, the problem could be a result of-a minor accumulation of air or uncondensable gases in the system-a leaking king valve-a clogged subcooler-liquid refrigerant flooding back from the cooling coil

68. Which of the conditions listed could cause excessively low refrigerant

pressure at the compressor suction?-insufficient flow of condenser cooling water-the system is low on refrigerant-the solenoid valve to the chill box is "frozen" in the open position-the high pressure cutout switch is inoperative

69. If a refrigeration compressor has developed a high head pressure as a result of a refrigerant overcharge, you should-increase the amount of cooling water to the condenser-decrease the amount of cooling water to the condenser-add more refrigerant to the system-remove some refrigerant from the system

70. Which of the conditions listed may be an indication of an excessive amount of refrigerant circulating through the system?-sweating of the compressor crankcase-colder than normal solenoid valve-frosting of the evaporator-weeping at the purge valve

71. Leaking suction valves in a refrigeration compressor are indicated by-higher than normal suction pressure-lower than normal suction pressure-lower than normal evaporator temperature-noticeable increase in compressor noise

72. If the discharge valves on the refrigeration compressor are leaking badly, the compressor should-run continuously-not start-have high discharge pressure-short cycle on the high pressure switch

73. To correct the condition of slugging and flooding back in a refrigeration system, it may be necessary to-re-adjust the discharge pressure-clean the expansion valve screen-add refrigerant-adjust the expansion valve

74. Noise in a refrigeration compressor can be caused by-worn bearings and piston pins-slugging due to flooding back-too much oil in circulation-all of the above

75. If a refrigeration system were short of refrigerant, the condition would result in-continuous running of the compressor-high suction pressure-high discharge pressure-short cycling of the compressor on the water failure switch

76. A warmer than normal compressor suction line might be caused by-insufficient lubrication-insufficient refrigerant-excess refrigerant

-excessive opening of the expansion valve

77. Which of the conditions listed will cause a refrigeration compressor to run constantly without simultaneously decreasing the temperature in the refrigerated space?-shortage of refrigerant oil-slight shortage of refrigerant-excessive condenser cooling water flow-faulty expansion valve 78. Frost appearing on the evaporator coils of a multi-box direct expansion refrigeration system-is best removed by means of ice pick-will increase the refrigeration effect-can be removed by passing hot vapors through the coils-can be quickly removed by simply shutting down the coils

79. In a compression refrigeration cycle, the temperature of the liquid refrigerant experiences its greatest decrease in the-evaporator-compressor-expansion valve-condenser

80. An increase in the heat load to a refrigeration system will cause

-the suction pressure to decrease-the suction temperature to increase-increased ice formation on the evaporator coil-excessive short cycling of the compressor

81. A bilge pump fails to take suction if either(a) the suction line is holed(b) the bilge suction non-return valve is stuck open(c) the bilge pump is operating on low efficiency

82.In a D- type water tube boiler with a secondary steam drum and super- heater, the steam is heated above the boiling point of water in the __________________A .Primary steam drum

B. Risers

C. Super- heater

Secondary steam drum

General New Qs(MARCH & APRIL):-

1) Perfect cooling means in air comp??2) How many hours we can work in threshold limit condition in some room???

8 hrs a day or 40 hrs a week 3) Function of hunting gear

a. All the above 3 other don remember4) If 16 kw draw in 380 rpm how much kw it will draw if we reduce the rpm to 350??

P directly cube of rpm sayad (12.5kw by this formula)5) For good purification in purifier we set feed rate low or high?6) What sort of hardness due to mg, carbonates etc?

ANS:- (Permanent)7) Gauging of safety v/v is done when??

ANS:- (for pr testing)8) Boiler feed water pp casing and impeller material??

ANS:- (casing cast steel & impeller stainless steel)9) Stearing gear 100% capability??10) Fan characteristic curves two questions11) Good housekeeping??12) Vacuum testing of evaporator??? Abc13) Two tube end joint- swaging???14) Hacksaw pitch??15) Cause of HP trip?? all the above is ans16) Hot work not permit ----all of above17) Specific gravity of centrifugal pump increases

a. Head n efficiency decreasesb. Power consumption increases

18) Which one is not a variable delivery pump??Gear or screw

19) Three methods of surface hardening of ferrous20) Welding of steel and aluminium??

TIG( tig used for dissimilar metals so most apt)21) FD fan power 16 kw, rpm 800 if it is reduced to 600, what will be new power??

( by P pro to cube of rpm 6.75kw)22) Sensible heat + latent heat…(total capacity)23) No of impeller helps to decide…single stage and multi stage24) Prior to entry to LNG tank?? warming25) Low carbon steel case hardening process??26) Relation bw cent pp Q & power relations??27) Free rotation of turbocharger???28) Slow and delay combustion effect on exh gas??29) Advancing of injection. Effect on power and exh gas??30) The RPM of d is 600 and hobbed teeth 46. If gears a b c have 94,80,30 teeth. How to find RPM of a ??

( this q has a fig , use N1.D1=N2.D2)

New

1) Remote location to shut off ER FO p/ps ( multiple)a. ECRb. Wheel housec. Cargo control roomd. All of the above

2) Power is generated by steam produced in boilera. Extractionb. Cogenerationc. Both a & bd. Neither a & b

3) During welding is not followed in path of welda. Lack of penetrationb. distortionc. Lack of fusiond. Arc slag

4) Pivot point in ship turns when moving ahead a. At amidshipb. Aft of 1/3 to 1/6 of ships length from bowc. Aft of 1/4to 1/6 of ships length from bowd. Aft of 1/5 to 1/8 of ships length from bow

5) Refrigerated vapor pr changes in ref system in a. In compressorb. In Evaporatorc. In expansion valved. Both A & C

6) Fan velocity flow and characteristics depends on a. Static pr is a measure of potential energyb. Velocity pr is used to calculate velocity flowc. Velocity flow is along line of vd. All the above

7) Air reservoir is not true fora. Collect airb. Remove pulsationsc. B….d. Increase pr of air

8) 0.83% carbon steel isa. Austeniteb. Ferritec. Pearlited. Don remember

9) 1 kg of steam at 100 to form water at 100a. 540kcalb. 580kcalc. 2260kcald. 560kcal

10) Increase in suction lift a. Head fallsb. Efficiency fallsc. Discharge capacity fallsd. All of the above

11) How to balance the impeller of multistage centrifugal p/pa. Having odd no of impellerb. Having even no of impellerc. Balancing wired. ..

12) A record of the types and strengths of steels used on a MODU must be included in the __________.( uscg 7)a. general plansb. builder's documentationc. Certificate of Inspectiond. construction portfolio

13) A continuous watertight bulkhead on a MODU may also be a/an __________.( uscg 9)a. structural bulkheadb. exterior bulkheadc. centerline bulkheadd. joiner bulkhead

14) Enlarging one tube end so the end of another tube of the same size will fit inside is termed __________.(uscg 94)a. Bellingb. Stretching c. Flaringd. Swagging

15) The purpose of annealing any metal is to make the metal _______.(uscg 96)a. Softerb. Smootherc. Harderd. Tougher

16) The floating end of a shell-and-tube type cooler utilizes a packing ring to __________.(uscg 108)a. prevent leakage past the floating end tube sheetb. dissipate heatc. baffle cooling water so it can be directed on a multiple passd. modify to a mixer type cooler

17) Water hammer in a steam heating system can be caused be____.(uscg 167)a. filling the auxiliary boiler with cold waterb. steam admitted to a cold pipec. filling the auxiliary boiler with hot waterd. draining a soot blower line before cracking the steam supply valve

18) who takes radial thrust in pumpsa. volute casingb. partition of double volute casingc. roller bearingd. none

19) In case of uptake fire , fire can be extinguished by….(mcq)a. Boundary coolingb. Fixed fire installationc. Using water directlyd. None

20) In variable delivery system how can maximum energy can be generated by which configurationa. Pure static headb. Pure friction headc. High static n low friction headd. Low static n high friction head

21) Internal FO transfer a. Regularly check ullage and soundingb. Inform CO to confirm the list /trimc. Follow internal transfer checklistd. All the above

22) Which type of tank are fully pressurized and semi pressurized typea. Type Ab. Type Bc. Type C

d. Type D23) Significance of knowing density of oil

a. To calculate amountb. For gravity disc to be fitted in purifierc. Identification of oild. All the above

24) In LO purifier what temp we should maintaina. 65-70b. 70-75c. 80-85d. 95-100

25) The middle part of the liner will be facing less temp but top part is more tem but still we pass the jacket water from mid part also. What will you do that midpoint not get corroded ( I think A)a. Can’t do anything, keep the jacket temp proper and cyl LO TBN and flow appropriate.b. After doing A some corrosion will take place.c. Don remd. Don rem

26) After oil spillage in ER what to doa. Start ows and pump outb. Start pump and put it in holding tank for separationc. Start pump n move to waste oil tank and then hand scoop and clean tank using environment friendly

cleanerd. Do nothing

27) Pr range in cut in and cut out of refer…a. Press distributionb. Differentialc. Operating range

28) If liner is chrome plated then piston rings should be coated of ???a. Chrome platedb. Grey cast ironc. Pearlite cast irond. Plasma coated

29) If rudder stock dia is more than 230mm thena. Both aux n main st gr to be power operated.b. Only auxc. Only maind. None of the above

30) What to use to reduce o2 in boilera. Hydrazineb. Sodium sulphitec. Both a n bd. Calcium sulphite

31) Before entering to empty LNG carrier for inspection what is primarily to be donea. Purgingb. Warmingc. Inerting

32) ME LO temp a. 60b. 65/70c. 75/100d. Don remember

33) What is the function of steam druma. Collect steamb. Collect waterc. Equalize water in generating tubesd. Collect salt deposit

34) Welding procedure of MODU is kept where??a. Vessel planb. Coast guard filec. Construction portfoliod. Certificate of inspection

35) Liquid pumping in lng depends on ( a or d)a. Vap prb. Absolute prc. Partial prd. Partial vap pr.

36) Purpose of telemotor by pass valvea. Top up the hydraulic oilb. As a relief valvec. Equalize the two lined. All

37) Air comp performance depends on a. Vane angleb. Dia of impellerc. Don remd. All

JAN & MARCH 20141)perfect cooling……. a)intercooler temp n after cooler temp same…reedsb)heat transfer of lub oil…..c,d

2)1 kg of steam at 100deg C to form water 100deg C a) 540b) 580c) 2260 d)560

3) 1 ton of refrig= 200 Btu/min = 3.517 kJ/s = 3.517 kW = 4.713 HPa)3000btub) 50.14c) 3.5kw

4)Max vaccum testing in evaporatora)pr testb)leak testc) drain test d)leak test in evp

8)Increase in suction lift …………. a)head falls

b)n-efficiency fallsc)disc capacity fallsd)all of above

9)carburizing ,nitriding,cyaniding…………are heat treatment processes

10)PH=6 Acidic Near to neutralNeutralAlkaline

11)cylinder head relief valve lifta)fuel pressureb)fuel timingc)exhaust tempd)exhaust pressure

12)fan characteristic….static pressure vertical,flow rate horizontal

13)multistage centrifugal pump,how to balance impeller?Having more odd no. of impeller and even no. of impeller

14)lining ,dunnage….disharge criteri a12nm…25nm from land outside special areas…completely prohibited new reg

15)Alkaline salts in boiler a)chlorideb)hydroxides n bi carbonates if c)sodium hydroxide(caustic soda) n ammonia n tri ammonium phosphateif p type hydroxides,carbonates phosphates,if t type only bi carbonates

16)fan curve how to rotate in aira)vane tipb)tip anglec)tip or hub ratiod)All above

17)Empty tank how to use SCBAa)LEL%b)21%c)Benzene, 0.01% lessd)All above

18)Bilge pipe system,type of valvea)globe valveb)Gate valvec)SDNRd)butterfly

19)cylinder…chrome plate

a)pearlite CIb)also chromec)stellite

20)furnace backpressurea)Acc. of oilb)Incorrect purge timingc)both a n bd)

21) over speed shutdown………fuel racks getting stuck and faulty governor,Racing n jumping of propeller in bad weathera)Governor…..singleb)Fuel system……..mcqc)….d)………

FEB 201422)COP is a function ofA)condenserb)evaporatorc)both a n bd)none of the above

23)sewage treatment plant procedurea)settling-aeration-chlorination-overboardb)aeration-settling-chlorination-overboardc)settling-chlorination-aeration-overboardd)chlorination-aeration-settling-overboard

24)identical fans are kept in seriesa)discharge pressure doublesb)static pressure doublesc)static pressure becomes four timesd)discharge pressure is 4 times

25)rudder stock is moved 230mm and above then in steering geara)one pump is usedb)both pumps are usedc)…..d)…..

26)volatility of petrol ,kerosene………ans..petrol

APRIL 201427)deflection of arc during welding is called

a)Lack of fusionb)Distortionc)Lack of penetrationd)Arc slag/blow

28)At which of the dew point temperature, air will have least moisture contenta) –10oCb) –20oCc) +30oCd) –40oC

29)For sub zero applications the secondary coolant normally used is:

a) Chilled waterb) Brinec) Lithium Bromided)Ammonia

30)Method of producing power by steam of boiler is called

a)Co generationb)Extractionc)both a n bd)neither a nor b

31)boiler turn down ratio for y jet type oil burner(answer from Flanagan book)a)10:1b)20:1c)5:1 d)2:1

32) NPSHa definition (forgot options)

33)Minimum pressure testing for low pressure boilera)15 barb)20 barc)205bard)None of the above

34) The discharge head of a centrifugal pump will vary directly with the A) Change in impeller diameter B) Square of the impeller diameter C)Cube of the impeller diameter D)Impeller efficiency for large changes in the size of the impeller

35) Pump power is directly proportional to the …………of pump impeller diametersA) No changeB) Square C)Cube D)None of the above

36)0.83% carbon indicatesA) PearliteB) CementiteC)FerriteD)None of the above

37)Air reservoir is not used forA) Collect airB) Remove pulsation from systemC)…………..D)Increase pressure of air

38)The pressure of refrigerant in vapour compression system changes in

a) Compressorb) Evaporation c) Expansion valved) Both (a) & (c)

39)pivot point in ship turns when moving aheadA) At amidhipsB) Aft of 1/3 to 1/6 of ships length from bowC) Aft of 1/4 to 1/6 of ships length from bowD) Aft of 1/5 to 1/8 of ships length from bow

40)Remote location to shut E/r fuel oil pumpsA) Wheel houseB) Engine roomC)Cargo control roomD)All of the above

SET 2 from senoirs1. TLV – 8 HOURS / DAY OR 40 HOURS/WEEK2. In ALCAP system, purpose of Transducer – 3.Chemical tanker coating – epoxy , phenolic4.House keeping prevents – Fire; risk to pollution; injury ; FW contaminate with oil5.Boiler steam stop valve is eased off from its seat while starting from cold – \6.Thermal expansion; to prevent water hammer ;…7. purpose of steam drum in 2 drum water tube boiler - to collect feed water ; to collect steam 8. Expansion valve setting is too low then .. cold compressor suction side

9. Low velocity fog – cool & smother

10. In halon system , Rupture disc is installed – to prevent over pressure of each cylinder…

11. Thermostatic steam trap – thermal expansion of fluid ; tendency of water flashes into steam …

12. Moisture of Refrigent results in—corrosion jamming of expansion valve

13. In D type boiler, water flow due to density difference b/ween steam & wtr

14. static pump suction lift from USCG

15. Refrigeration system valve location-- ( i think expansion vlv; evap vlv or liguid stop vlv)

16. before carry out any major in tank then aeration

17. 35 USCG ques no 77 from motor pdf

18. purpose of compensating rings in air bottle

19. few more questions from USCG general pdf

genral final with new questions to read

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