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Cavitation erosion occurs due to

A. Chemical action

B. Physical action

C. Chemical OR physical action

D. Combination of chemical or physical action

You must have used reinforced rubber joints. The reinforcement is normally provided

usin non!asbestos "bres. The reinforcement is provided because

A. Ordinary rubber as#et have a porous matri$% havin capillaries &hich can allo&

li'uid lea#ae &hen subjected to hih pressure

B. To increase the load carryin capacity of joint so it can &ithstand hiherpressures

C. To increase the temperature resistance of the joint

D. To protect the joints from "re or other accidental damae

A refrierant compressor &ill run continuously &hen there is

A. Too heavy coolin load on the system

B. Air in the system

C. (nsu)cient refrierant in the system

D. Any of the above

*hich of the follo&in types of boiler burners have ma$imum turn do&n ratio+

A. Pressure jet type

B. ,pinnin cup burner

C. ,pill type burner

D. Y!jet type burner

*hich of the follo&in can lead to sudden stoppin of a diesel enine+

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A. Air in fuel supply line

B. *ater in fuel supply line

C. Obstruction in air "lter

D. *ater in the air "lter

You have to dismantle a -.O. heater for cleanin. You have closed both the inlet and

outlet valves of the heater% both for -.O. steam side. *hat &ill you do before you

start openin up the heater+

A. There is nothin more to be done% if you #no& the valves are holdin you can

straiht a&ay start openin the heater &ithout &astin time

B. Drain the heater till pressure aue reads /ero and then start openin the heater

C. Drain the heater till -.O. stops comin out of the drain and then start openin the

heater

D. -irst open the vent valve and allo& the heater to de!pressuri/e and then open

the drain valve to drain the contents of the heater

The steels &ith a carbon percentae close to 0.12 have

A. poor strength but good weldability

B. High strength but poor weldabilityC. Poor strength and poor weldablity

D. High strength and good weldability

The cran# &eb de3ection readins of a diesel enine &ould be erroneous in &hich of

the follo&in conditions+

A. *hen the drauht of the vessel has chaned &hile readins &ere bein ta#en

B. *hen caro loadin and discharin has been too rapid

C. *hen the cran#case temperature has chaned substantially durin the process

of ta#in the readins.

D. 4one of the above

Durin shuttin do&n the puri"er you "nd that puri"er al&ays vibrates heavily for

some time and then becomes normal until it "nally comes to a stop. *hat should be

done to avoid this situation+

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A. The puri"er bo&l should be cleaned before ne$t startup

B. The bra#e should be applied so that the critical speed doesn+++t last lon

C. Complete overhaul of the puri"er should be carried out and the bearins need to

be rene&ed

D. The bo&l should be sent for balancin

The most important control measure to prevent boiler tube failure is5

A. 6se of proper refractory material

B. Proper maintenance of fuel burnin e'uipment

C. Proper maintenance of boiler &ater condition

D. All of the above

*hich one of the follo&in cannot provide alvanic protection to copper

A. Titanium

B. 7inc

C. ,teel

D. Aluminium

*hich of the follo&in statements are true as far as paintin of steel hull8structure

is concerned+

A. Paintin can be done under any &eather condition

B. Paintin can only be done after proper surface preparation is carried out

C. Paintin should only be done on top of appropriate primer coatin

D. ,everal coats of paint can be applied one after the other &ithout any time ap

*hich of the follo&in metals can be used as sacri"cial anode for protection of 9ild

,teel

A. Aluminium

B. 7inc

C. Cadmium

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D. All of the above.

You are pumpin out slude to a shore facility usin your slude pump. You "nd that

the dischare rate of pump is very slo& and suction "lter is ettin cloed

fre'uently.*hat is the best alternative to

counteract the problem+

A. Remove the pump suction "lter and pump out the tan#

B. (ncrease the tan# temperature% #eep an eye on the pump suction pressure and

clean the "lter as soon as it drops

C. As soon as the as the shore facility tells you that they are not receivin any

slude% you stop the pump and clean the "lter

D. -abricate a bier mesh si/e suction "lter and use in place of normal "lter so

that fre'uency of "lter

bloc#ae is reduced and you can et a better dischare rate

4ormally so called +++sinle scre& pumps+++ are used as slude pumps in enine

room. *hat is the correct technical name of these pumps+

A. ,na#e Pump

B. ,cre& Pump

C. Proressive cavity pump

D. :erotor Pump

You have to open up a -.O. heater for cleanin. As ;nd enineer has reported that

the valves of -.O. inlet is not holdin% the 98< &as chaned over to D.O. durin

arrival port and the -.O. system &as shut do&n after arrival port. You have been

instructed to open up the heater. *hat &ill you do+

A. ,tart openin up the heater riht a&ay as any&ay isolation valves are lea#in%

but the system is shut do&n

B. (solate the valves as re'uiredand allo& the heater to depressuri/e and drain

completely prior openin

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C. Depressuri/ation of heater may be carried out if re'uired and then it can be

opened up

D. The job cannot be done and needs to be done in dry!doc#

*eldability of steel depends upon its carbon e'uivalent . ,elect the most

appropriate Carbon

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C. ,tern tube seal are operational

D. All of the above

*hich of the follo&in option ives you the correct se'uence of the metals inincreasin order of

nobility in :alvanic series +

A. 7inc % 9anesium % Aluminium % ,teel

B. 9anesium% 7inc % ,teel % Aluminium

C. Aluminium % 7inc % 9anesium % ,teel

D. 9anesium % 7inc % Aluminium % ,teel

,cre& pump is normally used for

A. -luids &ith hih viscosity

B. -or better performance at variable temperature

C. 3uid mi$ed &ith solids

D. all above

The land of main sea &ater pump &as lea#in badly. You have rene&ed all the

pac#ins usin pac#ins of correct si/e and speci"cation. After startin the pump%

you see that the pump land is still lea#in badly and doesn+++t stop even after

tihtenin of land. *hat is the most probable cause+

A. The pac#ins used are duplicate and should be replaced &ith the oriinal

B. The coolin &ater supply to lantern rin is cloed

C. There is some scale formation on the shaft in &ay of land pac#ins

D. The shaft sleeve is scored and needs replacement

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*hich of the follo&in option ives you the correct se'uence of the metals8alloys in

decreasin order of preferential corrosion &hen all of them are bonded and

immersed in an electrolyte+

A. ,tainless ,teel % 4aval Brass % Aluminium bron/e % Copper

B. AluminiumBron/e %Cupro!4ic#el % 9onel metal % Titanium

C. ,tainless ,teel %Cupro!4ic#el %4aval Brassl % 9onel 9etal

D. ,tainless ,teel % Copper% 4aval Brass % Aluminium bron/e

(n &hich of the follo&in types of refractory failure% softenin of the refractory bric#s

ta#es place due to presence of sodium8vanadium in fuel+

A. ,pallin

B. Crac#in

C. ,hrin#ae crac#in

D. ,lain

*hich of the follo&in valves cannot prevent bac#3o& of li'uid in a pipeline+

A. :ate valve

B. :lobe Chec# Falve

C. ,&in Chec# Falve

D. Anle chec# valve

(n a shell and type 98< G.O. cooler% the temperature of G.O. is controlled by an

automatic temperature control valve. Out at sea &ith 98< runnin at sea load it isobserved that the temperature control valve openin to the cooler is increasin day

by until it becomes E002 open to the cooler. The G.O. outlet temperature

HHHHHHHHHHHHHHH after the above condition has reached

A. ,tarts decreasin immediately

B. ,tarts increasin immediately

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C. *ill be maintained at the set point of the temperature controller

D. Cannot be maintained at the set point and &ill increase slo&ly

Copper tubin is used in Refrierant system because

A. (t has less internal resistance

B. (t is cheaper compared to other materials

C. (t is easier to chec# lea#s in copper based system

D. 4one of the above

A recently completely overhauled

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A. -uel oil density is too hih

B. -riction pads &orn out and slippin on the friction pulley

C. Oil temperature too hih

D. (ncorrect si/e ravity disc

Corrosion of sea &ater cooled shell and tube type heat e$chaners is provided by 5

A. Protective paint coatins and sacri"cial anode

B. 9arine :ro&th Prevention ,ystems

C. (CCP

D. (njection of corrosion inhibitors to coolin sea &ater

*hich of the follo&in is an important re'uirement for proper functionin of

sacri"cial anode system 5!

A. :ood (nsulation bet&een anodes and ship+++s hull

B. :ood electrical continuity bet&een anodes and ship+++s hull

C. Providin protection of anodes from bein painted over durin hull paintin

D. Presence of an insulatin material bet&een anode and the cathode

You have opened up a sea chest "lter for cleanin.(nside the ,tainless steel buc#et

type "lter &as found. After removal of "lter it &as found that a /inc anode &as lyin

at the bottom of "lter body.The purpose of anode is to provide cathodic protection

to the HHHHHHHHHH and /inc anode should be electrically HHHHHHHHHHHHH &ith the "lter

body.Choose the correct pair of alternatives5

A. ,tainless steel "lter% (solated

B. 9ild steel body% continuous

C. Adjacent pipeline% continuous

D. ,ea Chest% (solated

By &hich of the follo&in is the attached vacuum pump of a ballast pump is driven+

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A.

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D. 4one of the above

The mechanical seal is used to seal the ap bet&een

A. The impeller and the shaft

B. The shaft and the casin

C. The impeller and the casin

D. *ear rin and impeller

The centrifual pump are normally

A. Positive displacement type

B. Rotodynamic type

C. ,cre& type

D. :ear type

You have valves of same bore diameter but of diJerent types.*hich of the follo&in

is arraned in the

decreasin order closin tor'ue re'uired for ivin a perfect seal+

A. :lobe valve% Ball valve% Butter3y valve=rubber seat>

B. Ball valve% :lobe valve% Butter3y valve=rubber seat>

C. Butter3y valve=rubber seat>% :lobe valve% Ball valve

D. :lobe valve% Butter3y valve=rubber seat>% Ball Falve

The purpose of an evaporator in the domestic refrieration system is to

A. Transmit latent heat of evaporation

B. Absorb latent heat of fusion

C. Absorb latent heat of evaporation

D. Transmit latent heat of fusion

Correct method of reasin a centrifual pump bearin is5

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A. To pump the rease until you feel hih bac# pressure on the :rease pump

B. To pump the reasefor ! pumpin stro#es of :rease pump for each bearin

C. To pump the rease &hen the pump is stopped and drain any old rease at the

same time by openin the drain plu% ivin only ! pumpin stro#es on :rease

pump for each bearin. the drain plu should then be replaced

D. To pump the rease &hen the pump is runnin and drain any old rease at the

same time by openin the drain plu%until all the old rease is removed and ne&

rease starts comin out of the drain% repeatin samefor each bearin. the drain

plu should then be replaced

All other conditions remainin constant% &hen centrifual pump is chaned over for

pumpin a li'uid of hiher speci"c ravity% the dischare head of the pump at the

rated capacity &ill

A. increase

B. decrease

C. Remain same

D. Can+++t say% depends on other factors too

Durin strippin operation the dischare valve is #ept throttled to maintain

su)cient bac# pressure% &hy+

A. To avoid bac# 3o& of sea &ater into the ballast tan#

B. (f bac# pressure is not su)cient% the ballast &ater cannot be pumped out as the

sea &ater head on the outside is more

C. To avoid pump losin suction due to loss of primin as the available suction head

is very lo&

D. To control the motor current &hich &ill other&ise be very hih The process of

depositin 7inc coatin on to steel surfaces by Iot dippin in molten /inc is #no&n

as 5

A. ,herardisin

B. Chromisin

C. Calorisin

D. :alvanisin

*hich of the follo&in &ould be the correct &ay=s> of usin a tor'ue &rench+

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A. Application of jer# pulls &hile tihtenin

B. 6sin an e$tension

C. Tihtenin beyond the characteristic clic#in sound

D. 4one of the above

A thin layer of electrolyte trapped in a small pits on a metal surface % and remainin

stanant over a period of time % may cause 5

A.

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