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1. When a substance is gaseous states is below the criticaltemperature it is called:

A. VaporB. CloudC. MoistureD. Steam

2. Is the condition of pressure and temperature at which aliquid and its vapor are indistinguishable:

A. Critical pointB. Dew pointC. Absolute humidityD. Relative humidity

3. If the temperature is held constant and the pressure isincreased beyond the saturation pressure, we have a:

A. Saturated vaporB. Saturated liquidC. Compressed liquidD. Subcooled liquid

4. A Francis turbine has what flow:A. Inward flow reactionB. Outward flow impulseC. Outward flow reactionD. Inward flow impulse

5. The latent heat of vaporization in joules per kg is equal t o:A. 5.40 x 102B. 4.13 x 103 C. 22.6 x 105D. 3.35 x 105

6. Form of energy associated with the kinetic energy of therandom motion of large number of molecules:

A. Internal energyB. Kinetic energyC. Heat of fusionD. Heat

7. In a P-T diagram of pure substance, the curve separatingthe solid phase from the liquid phase is: Answer : B

A. Vaporization curveB. Fusion curveC. Boiling pointD. Sublimation point

8. The number of protons in the nucleus of an atom of thenumber of electrons in the orbit of an atom:

A. Atomic volumeB. Atomic numberC. Atomic weightD. Atomic mass

9. The energy of fluid flowing at any section in a pipeline isa function of:

A. Velocity of flow onlyB. Pressure onlyC. Height above a chosen datum, density,

internal energy, pressure and velocity of

flow

D. Pressure, height above a chosen datum,velocity of flow, density of fluid

10. A type of water turbine:A. ParsonB. HeroC. PeltonD. Banki

11. if the pressure of the confined gas is constant, the volumeis directly proportional to the adsolute temperature:

A. BoyleB. JouleC. CharlesD. White body

12. A theoretical body which heated to incandescence wouldemit a continuous light-ray spectrum:

A. Black body radiationB. Black bodyC. Blue bodyD. White body

13. Ignition of the air fuel mixture in the intake of the exhaustmanifold:

A. BacklashB. BackfireC. Exhaust pressureD. Back pressure

14.15. When a substance in gaseous state is below its critical

temperature it is called:

A. SteamB. CloudC. MoistureD. Vapor

16. Which of the following a set of standard condition:A. 1 atm, 255k, 22.41 m3/kg moleB. 101.325, 273 ok, 22.4 m3/kg moleC. 101.325, 273 ok, 23.66 m3/kg moleD. 1 atm, 10 oC, 22.41 m3/kg mole

17. Number of molecules in a mole oif any substance is aconstant called:

A. Rankine cycleB. Avogadros numberC. Otto cycleD. Thompson constant

18. A simultaneous generation of electricity and steam (orheat) in a single power plant:

A. Gas turbineB. Steam turbine-gas turbine plantC. Waste heat recoveryD. Cogeneration

19. Is one whose temperature is below the saturationtemperature corresponding to its pressure:

A. CompressionB. CondensationC. Constant volume processD. Subcooled liquid

20. Pump used to increase air pressure above normal, air isthen used as a motive power:

A. Air cooled engineB. Air compressorC. Air condenserD. Air injection

21.22. The locus of elevation:

A. Critical pointB. Hydraulic gradientC. Energy gradientD. Friction gradient

23. In sensible cooling process, the moisture content:A. Does not changeB. DecreasesC. IndeterminateD. Increases

24. What is the process that has no heat transfer?A. ReversibleB. IsothermalC. PolytropicD. Adiabatic

25. The internal combustion engines never work on______cycle:

A. RankineB. DieselC. Dual combustionD. Otto

26. The dividing point between the high pressure and lowpressure sides of the refrigeration cycle occurs at the:

A. Expansion valveB. CompressorC. CondenserD. Cooling oil

27. What is the force which tends to draw a body toward thecenter about which it is rotating?

A. Centrifugal forceB. Centrifugal in motionC. Centrifugal advanceD. Centrifugal force

28.

29. Percent excess air is the difference between air actuallysupplied and theoretically required divided by:

A. The theoretical air suppliedB. The deficiency air suppliedC. Gas turbine plantD. Waste heat boiler

30. What amount of air is required in a low bypass factor?A. GreaterB. LesserC. IndeterminateD. Does not change

31. Work done per unit charge when charge is moved fromone point to another:

A. Equipotential surfaceB. Potential at a pointC. Electrostatic differenceD. Potential difference

32. A pressure o 1 millibar is equivalent to:A. 1000 dynes/cm2B. 1000 cm of HgC. 1000 psiD. 1000 kg/cm2

33. Heat transfer due to density differential:A. ConvectionB. NuclearC. ConductionD. Radiation

34. When a system deviates infinitesimally from equilibriumat every instant of its state, it is undergoing:

A. Isobaric processB. Quasi-static processC. Isometric processD. Cyclic process

35. The ratio of the average load to peak load over adesignated of time is called:

A. Load factorB. Reactive factorC. Diversity factorD. Plant use factor

36. What is the clockwork-operated device which recordscontinuously the humidity of the atmosphere?

A. HetographB. HygrometerC. HydrodeikD. Hydrograph

37. What is an apparatus used in the analysis of combustiblegases?

A. Calorimeter differentialB. Calorimeter gas

C. CalorimetryD. Calorimeter

38. if the fluid travels parallel to the adjacent layers and thepaths of individual particles do not cross, the flow is said

to be:

A. TurbulentB. CriticalC. DynamicD. Laminar

39. What equation applies in the first law of thermodynamicsfor an ideal gas in a reversible open steady-state system?

A. QW = U2U1B. Q + VdP = H2H1 C. QVdP = H2 - H1 D. QPdV = H2H1

40. Is one whose pressure is higher than the saturationpressure corresponding to its temperature:

A. Saturated liquidB. Compressed liquidC. Saturated vaporD. Compressed gas

41. The locus of elevation to which water will rise in thepiezometer tube is termed:

A. Energy gradientB. Friction headC. Hydraulic gradientD. Critical path

42. The total energy in a compressible or incompressible fluidflowing across any section in a pipeline is a function of:

A. Pressure and velocityB. Pressure, density and velocityC. Pressure, density, velocity and viscosityD. Flow energy, kinetic energy, height

above datum and internal energy

43. The ratio of the density of a substance to the density ofsome standard substance is called:

A. Relative densityB. Specific gravityC. Specific densityD. Relative gravity

44. At any instant, the number of particles passing everycross-section of the stream is the same, the flow is said to

be:

A. Steady flowB. Uniform flowC. Continuous flowD. Turbulent flow

45. The hydraulic CA i s use to find:A. Quality of discharge through an orificeB. Velocity of flow in a closed conduitC. Length of pipe in a closed networkD. Friction factor of a pipe

46. The sum of the energies of all molecules in a system,energies appear in several complex forms, is the:

A. Kinetic energyB. Potential energyC. Internal energyD. Thermal energy

47. The temperature at which its vapor pressure is equal t o thepressure exerted on the liquid:

A. Absolute humidityB. CalorimeterC. Boiling pointD. Thermal energy


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48. Type of turbine that has high pressure and low pressure iscalled:

A. Compound engineB. Gas turbineC. Impulse turbineD. Compound turbine

49. The design of an air supply duct of an air conditioningsystem:

A. Adds moisture to the airB. Lowers the temperature of the airC. Does noaffect the distribution of airD. Affects the distribution of air

50. The changing of solid directly to vapor, without passingthrough the liquid states is called:

A. EvaporationB. VaporizationC. SublimationD. Condensation

51. The volume of a fluid passing a cross-section stream inunit time is called:

A. Steady flowB. VaporizationC. DischargeD. Continuous flow

52. Weight per unit volume is termed as:A. Specific gravityB. DensityC. Weight densityD. Specific gravity

53. S.I units of force:A. PoundsB. NewtonC. KilogramsD. Dyne

54. Heat exchanger used to provide heat transfer between theexhaust gases and the air prior to its entrance to the

combustion:

A. EvaporatorB. Combustion chamberC. RegeneratorD. Heater

55. Heat normally flowing from a high temperature body to alow temperature body wherein it is impossible to convert

heat without other effects is called:

A. Second law of thermodynamicsB. First law of thermodynamicsC. Third law of thermodynamicsD. Zeroth law of thermodynamics

56. What are the immediate undesirable products from thepetroleum-based lubricating oil when subjected to highpressure and temperature?

A. Gums, resins and acidsB. SulfurC. Soots and ashesD. Carbon residue

57. The intake pipe to a hydraulic turbine from a dam is:A. TailraceB. Spiral casingC. Surge tankD. Penstock

58. When 1 mol of carbon with 1 mol oxygen:A. 2 mols carbon dioxideB. 1 mol carbon dioxideC. 1 mol carbon and 1mol CO2

59. A device for measuring the velocity of wind:A. Aneroid barometerB. AnemometerC. AnemoscopeD. Anemograph

60. Air standard efficiency of a diesel engine depends on:A. SpeedB. Compression RatioC. FuelD. Torque

61. Heavy water is:A. B2OB. H2OC. W2OD. D2O

62. The ratio of the sum of individual maximum demands ofthe system of the to the overall maximum of the whole:

A. Demand factorB. Diversity factorC. Power factorD. Utilization factor

63.64. Mechanism designed to lower the temperature of air

passing through is:

A. Air coolerB. Air defenseC. Air spilloverD. Air cycle

65. The term exposure in radiological effects is used as ameasure of a Gamma ray or an X-ray field in the surface

of an exposed object. Since this radiation produces

ionization of the air surrounding the object, the exposure

is obtained as:

A. x = no. of ions produced per mass of airx coulombs per kg

B. x = mass of air x surface area of anexposed object

C. x = mass of air over surface area of anexposed object

D. x = no. of ions produced per mass of air+ coulombs per kg

66. The viscosity of most commercially available petroleumlubricating oil changes rapidly above:

A. 120FB. 180FC. 150FD. 130F

67. A type of water turbine where a jet of water is made tofall on the blades or buckets and due to the impulse of

water, the turbine starts to move:

A. Pelton wheelB. Steam turbineC. Francis turbineD. Reaction turbine

68. What condition exists in an adiabatic throttling process:A. Enthalpy is variableB. Enthalpy is constantC. Entropy is constantD. Specific volume is constant

69. The specific gravity of a substance is the ratio of itsdensity to the density of:

A. mercuryB. gasC. airD. water

70. Which is used as a moderator in certain types of nuclearreactors:

A. vaporB. heavy waterC. hot waterD. cold water

71. Yeast as raw material for beer making is added to theequipment called:A. Fermenters

B. Brew kettleC. CoolerD. Starting tubs

72. What keeps the moisture passing from the system:A. DehydratorB. AeratorC. TrapD. Humidifier

73. What are the main components in a combined cyclepower plant:

A. Diesel engine and air compressorB. Gas engine and waste heat boilerC. Steam boiler and turbineD. Nuclear reactor and steam boiler

74. What do you call the weight of the column of air aboveearths surface:

A. Air pressureB. Aerostatic pressureC. Wind pressureD. Atmospheric pressure

75. Combined process of cooling and humidifying is alsoknown as:

A. Heating and humidifyingB. Cooling towerC. Evaporative cooling processD. Moisture removal process

76. What is the force required to accelerate a mass of 1 gramat a rate of 1 cm/sec/sec:

A. dyneB. puondalC. slugD. kg force

77. What type of turbine has low heat and high discharge:A. Pelton wheelB. Francis turbineC. Jonval turbineD. Kaplan turbine

78. What is a Bull Head Tee:A. A pipe tee with head shaped like a bullB. A welded built-up tee a pipe tee with its

run larger than its branch

C.D. A pipe tee the branch of which is larger

than the run

79. What is the main power generating plant that produces themost electricity per unit thermal energy in t he fuel and has

the greatest surplus of electricity for most cogeneration

systems:A. Steam engineB. Steam turbineC. Gas turbineD. Diesel turbine

80. What is the term as the ratio of the volume at the end ofheat addition to the volume at the start of heat addition:

A. Compression ratioB. Air-fuel ratioC. Volumetric ratioD. Cut-off ratio

81. What is the ideal cycle for gas turbine work:A. Brayton cycleB. Stag combined cycleC. Bottom cycleD. Encasson Cycle

82. What do you call the passing of heat energy frommolecule to molecule through a substance:

A. conductionB. radiationC. conservationD. convection

83. What is the lowest temperature to which water couldpossibly be cooled in a cooling tower:

A. The effective temperatureB. The temperature of adiabatic saturationC. The wet bulb depressionD. The dew point temperature of the air

84. The indicator used to determine the anti-knockcharacteristics of gasoline:

A. Aniline pointB. Cetane no.C. Octane no.D. Diesel index

85. Dew point is define as:A. The temperature to which the air must

be cooled at constant pressure to

produce saturation

B. The point where the pressure andtemperature lines meet

C. The temperature which dew is formedin the air

D. The pressure which dew is formed inthe air

86. What type of lubricating oils are produced entirely fromthe crude chosen through elimination of undesirable

constituents by suitable refining processes:

A. AdditivesB. InertC. StraightD. Premium

87. In a liquid-dominated geothermal plant, what processoccurs when the saturated steam passes through the

turbine:

A. IsobaricB. PolytropicC. IsometricD. Isentropic

88. Gas being heated at constant volume is undergoing theprocess of:

A. IsotropicB. AdiabaticC. IsometricD. Isobaric

89. A receiver in an air compression system is used to:A. Avoid cooling air before usingB. Increase the air discharge pressureC. Collect the water and grease suspended

in the air

D. Reduce the work needed duringcompression

90. Foundation are preferably built of concrete in theproportion of air in the proportion of what measure of

what measures of a regenerator :

A. 1:2:5B. 2:4:6C. 2:3:4D. 1:2:4

91. How does the values for work per unit mass flow of air inthe compressor and turbine influenced by the addition of a

regenerator:

A. Slightly increasedB. UnchangedC. Greatly decreasedD. Greatly increased


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92. The work done by a force of R Newton moving in adistance of L meters is converted entirely into kinetic

energy is expressed by the equation:

A. RL = 2MV2B. RL = RL N-mC. RL = MV2D. RL = MV

93. In a steam generator with good combustion control, whatoccurs if the load is increased:

A. Air temperature leaving air heaterdecreases

B. Air temperature entering air heaterincreases

C. Furnace pressure approximatelyconstant

D. Economizer gas outlet temperaturedecreases

94. The color of lubricating oil indicate:A. Does not indicated contaminationB. Does not indicates qualitiesC. QualitiesD. Viscosity

95. For design stability, the center of gravity of the totalcombined engine, driven equipment and foundation

should be kept:

A. AnywhereB. Above the foundation topC. In line with the surface of thefoundationD. Below the foundation top

96. Most commercially available petroleum lubricating oildeteriorates starting from operating temperature of:

A. 150FB. 200FC. 300FD. 250F

97. What is the suggested maximum permissible dose (MPD)of gamma ray exposure for general individuals not

working in a nuclear setting, by choice, in rem/year:

A. 1B. 5C. 1/5D. 3

98. There are two broad types in the classification oflubricating oils, they are: straight and:

A. ActiveB. InactiveC. CrockedD. Additives

99.100. What is the function of the compression joint of pipes

or tubes:

A. It is used to connect two pipes bywelding

B. It is used to connect two pipes bypressing both ends

C. When tightened, compressed tapered,sleeves so that they form a tight joint on

the periphery of the tubing they connect

D. It connects two pipes with the use ofthreaded couplings

101.

The components of a rotary pump:A. GearB. Piston

C. ImpellerD. Screw

102. An instrument commonly used in most research andengineering laboratories because it is small and fast

among the other thermometers:

A. Mercury thermometerB. Liquid-in-gas thermometerC. Gas thermometerD. Thermocouple

103. What is the term used in to express the ratio of specifichumidities, actual versus saturated:

A. Relative humidityB. Absolute humidityC. Degree of saturationD. Percent

103. What is the process whereby a fashionable speciesutilized as a source of neutrons to produce more nuclei

of its own kind than are used up:

A. DevelopingB. CulturingC. MultiplyingD. Breeding

104. The process of heat transfer due to motion mattercaused by a change in density:

A. AbsorptionB. RadiationC. ConductionD. Convection

105. What is the most efficient thermodynamic cycle:A. CarnotB. DieselC. RankineD. Brayton

106. How do treat a statement that is considered a scientificlaw:

A. We postulate to be trueB. Accept as a summary of experimental

observation

C. We generally observe to be trueD. Believe to be derived from

mathematical theorem

107. The transmission of heat from one place to another byfluid circulation between spots of different t emperature

is called:

A. ConvectionB. RadiationC. ConservationD. Conduction

108. What is referred by volume control:A. An isolated systemB. Closed systemC. Fixed region in spaceD. Reversible process only

109. Which of the following types of flow meters is mostaccurate:

A. Vent tubeB. Pitot tubeC. Flow nozzleD. Foam type

110. Pneumatic tubes are powered by:A. SteamB. WaterC. Natural gasD. Air

111. A graphical presentation between discharge and time isknown as:

A. HectographB. MonographC.

Hydrograph

D. Topograph

112. In a diesel engine, what elements in the fuel that makethe work of the lubricant more difficult:

A. Water and ash contentB. High octane numberC. High cetane numberD. Sulfur and asphaltenecontent

113. What is the function of a radiation pyrometer:A. Boiler water weightB. Boiler pressureC. Furnace t emperatureD. Boiler drum pressure

114. The specific measurement of moisture content in air:A. Relative humidityB. Percent saturationC. Degree of saturationD. Specific humidity

115. Highest pressure drop in refrigeration cycle:A. CompressorB. CondenserC. Expansion valveD. Evaporator

116. What is an expansion loop:A. A double radius elbow to minimize

friction losses

B. A pipe bent to a loop to changedirection

C. A pipe expander fittingD. A large radius bend in pipe line to

absorb longitudinal expansion in the

pipe line due to heat

117. What is the color code of steam pipe lines:A. Silver grayB. GreenC. RedD. Yellow

118. What is absorbed by sulphites in boiler water treatment:A. OxygenB. Carbon dioxodeC. Impurities settled in mud drumsD. Carbon dioxide and oxygen

119. What is meant by choking in pipe flow:A. The specified mass flow rate cannot

occur

B. Shock waves cannot occurC. A valve is closed in a lineD. A restriction in flow area occurs

120. What is a check valve:A. A valve design to allow a fluid to pass

through in one direction only

B. A valve designed to release the excesspressureC. A valve which allows flow of fluid in

either direction

D. A valve used for checking the pressureof fluid

121. What is the purpose of providing the lubricating oil pre-heater in an emergency standby diesel genset:

A. To keep the lube oil viscosity downunder the cold condition and enhance

the starting of the cold engine

B. To avoid moisture condensation in theengine

C. To avoid corrosion to engine partsD. To see to it that the lubrication system

is functioning properly

122. Which of the following refrigerants is most highlytoxic:

A. AmmoniaB.

Freon 12

C. Sulfur dioxideD. Methyl Chloride

123. Water turbine converts:A. Mechanical energy into electrical

energy

B. Hydraulic energy into electrical energyC. Mechanical energy into hydraulic

energy

D. Hydraulic energy into mechanicalenergy

124. How do you differentiate surge from water hammer:A. Time for a pressure to traverse the pipeB. The pressure of reservoir at the end of

the pipe

C. Rate of deceleration of flowD. Relative compressibility of liquid toexpansion

125. Throttling of the refrigerant through the expansionvalve in a vapor refrigeration cycle is:

A. Reversible adiabatic processB. Constant entropy processC. Irreversible adiabatic processD. Isometric process

126. Assuming real process, the net entropy change in theuniverse is:

A. Must be calculatedB. Equal to zeroC. NegativeD. Positive

127. What characterizes a reaction turbine:A. Steam losses velocity as it leaves the

diaphragm

B. Steam strikes the blades at right anglesC. Steam will react with a force in the

diaphragmD. Steam is deflected

128. The work done in an adiabatic process in a system:A. Is equal to the change in t otal energy in

a closed system

B. Is equal to the net heat transfer plus theentropy change

C. Is equal to the change in total energy ofclosed system plus entropy change

D. Is equal to the change in total energy ofclosed system plus net heat transfer

129. How do you increase the output of a centrifugal pump:A. Speed up rotationB. Install circulation lineC. Increase the suction pipe areaD. Increase the discharge pipe area

130. Based on the first law of thermodynamics, which of thefollowing is wrong:

A. The heat transfer equals the work plusthe energy changeB. The heat transfer cannot exceed the

work done

C. The net heat transfer equals the networkof the cycle

D. The net heat transfer equals the energychange if no work is done

131. The main cause of air pollution as a result of burningfuel oil is:

A. Sulfur dioxideB. Silicon dioxideC. Hydrogen dioxideD. Nitrogen dioxide

132. What takes place in a uniflow scavenging? A. Turbo blower in exhaust header to

create vacuum in cylinder

B. Air reversing direction in cylinderC. Uses two blowers to purge cylinderD.

Air traveling in one direction

133. The diagonal lines the Psychrometric Chart represent:


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A. Effective temperatureB. Dry-bulb temperatureC. Wet-bulb temperatureD. Dew-point temperature

134. An ideal gas is compressed isothermally the enthalpychange is:

A. Sometimes negativeB. ZeroC. Sometimes positiveD. Indeterminate

135. A system with paddle wheel work is irreversible,therefore, the change in its entropy:

A. Is zeroB. Greater than zeroC. Maybe negativeD. Maybe positive, negative or zero

136. What is meant by brake horsepower:A. Power developed in the engine with

cylinder

B. Final horsepower delivered to theequipment

C. Actual horsepower delivered to theengine drive shaft

D. Work required to raise a weight of33,000 pounds at a heght of one foot

in one minute

137. Enthalpy of an ideal gas is a function only of :A. EntropyB. Internal energyC. TemperatureD. Pressure

138. When droplets of water are carried by steam in theboiler:

A. PrimingB. FoamingC. CarryoverD. Embrittlement

139. Mechanical energy of pressure transformed into energyof heat:

A. Kinetic energyB. EnthalpyC. Heat exchangerD. Heat of compression

140. The ratio between the actual power and the apparentpower in any circuit is know :

A. Measured powerB. CapacityC. Power FactorD. KVAR

141. The products of complete combustion of gaseoushydrocarbons :

A. Carbon dioxide and waterB. Carbon monoxideC. Carbon monoxide, water and ammoniaD. Water, carbon monoxide and carbon

dioxide

142. The part that directs the flow of the refrigerant throughthe compressor :

A. Wrist pinB. ValveC. PistonD. Connecting rod

143. An odorless refrigerant, its boiling point varies over awide range of temperature:

A.

Freon 22B. Freon 12C. Freon r efrigerant

D. Ammonia144. The boiling point of Freon 22 is:

A. -41.04 0 FB. 40.60 0 FC. -38.40 0 FD. -31.40 0 F

145. Medium pressure when applied to valves and fittings,implies they are suitable for a working pressure of from

:

A. 862 to 1200 kPaB. 758 to 1000 kPaC. 500 to 1000 kPaD. 685 to 1050kPa

146. A general term for a device that receives information inthe form of one more physical quantities, modifies the

information and/or its form, if required, and produces a

resultant output signal:

A. ConverterB. TransducerC. SensorD. Scanner

147. In the process of pair formation, a pair cannot beformed unless the quantum has an energy greater than:

A. 2m sub 0 C2 B. mV2 C. 0.5MeVD. hv/c

148. The temperature of hot metals can be estimated by theircolor. For steel or iron, the color scale at 2200 0 F isroughly:

A. WhiteB. OrangeC. Dark redD. Yellow

149. Mathematically, a thermodynamic property is which ofthe following?

A. A point functionB. DiscontinuousC. A path functionD. Exact differential

150. A device whose fuction is to pass an information in anunchanged for or in some modified form :

A. RelayB. SensorC. TransmitterD. Transducer

151. A device whose primary function is to meter the flow ofrefrigerant to the evaporator:

A. Sniffer valveB. EqualizerC. Thermostatic expansion valveD. Crossover valves

152. The volume remaining when the piston reaches the endof the compression stroke:

A. Air cellB. Combustion chamberC. Turbulence chamberD. Pre-combustion chamber

153. Specific heat capacity is an SI derived unit describedas:

A. J/kgB. W/m0 KC. J/m3 D. J/kg0 K

154. The fundamental difference between pipe and tubing is:

A. The dimensional standard to whicheach is manufactured

B. Compression jointsC. The smoothness of the surfaceD. Bell and spigot joint

155. One of the most popular types of compressor utilizedfor supercharging engine is the:

A. Roots type blowerB. Pulse turbochargerC. Constant pressure turbochargerD. Turbo compressor

156. Crankshaft of reciprocating type compressor isbasically made of :

A. Semi-steelB. Aluminum alloyC. Cast ironD. Steel forging

157. A chemical method of feedwater treatment which usescalcium hydroxide and sodium carbonates as reagents:

A. Thermal treatmentB. Lime soda treatmentC. Demineralization processD. Ion exchange treatment

158. Engines using heavy fuels requires heating of the fuelso that the viscosity at the injector is:

A. Around 200 SSUB. 100 SSU or lessC. 200 SSU+50D. 150 SSU or slightly higher

159. The temperature of the fluid flowing under pressurethrough a pipe is usually measured by:

A. Glass thermometerB. Electric-resistance thermometerC. ThermocoupleD. All of the above

160. An increase in the deposition of slag and ash on thesurface for heating of oil-fired boilers in both marine

and stationary service has affected boiler efficiency.

The following are the causes except:

A. Low temperature corrosion of thecold section of air heaters and duct

works

B. Slagging of high temperaturesuperheater surfaces

C. High temperature corrosion steelD. Increase of heat transfer in the boiler

161.

162. Which does not belong to the group?A. Air injection systemB. Mechanical injection systemC. Time injection systemD. Gas admission system

163. Cooling water system consists of equipment to dissipateheat absorbed by the engine jacket water, tube oil and

the heat to be remove from air intercooler is measurable

to keep the engine outlet water temperature constant

and the differential of the cooling water at a minimum

preferably not to exceed:

A. 10 to 30 0 FB. 10 to 50 0 FC. 10 to 20 0 FD. 10 to 40 0 F

164. In a water tube boiler, where is heat and gases ofcombustion passed?

A. Through the combustion chamberonly

B. Through the tubesC. Away from the tubesD.

Around the tubes

165.

166. The instrument used to measure atmospheric pressureis:

A. RotameterB. ManometerC. VentureD. Barometer

167. A refrigeration system in which only part of therefrigerant passes over the heat transfer surface is

evaporated and the balance is separated from the vapor

and r e-circulated:

A. Direct expansion systemB. Chilled water systemC. Flooded systemD. Multiple system

168. When four events take place in one revolution of acrankshaft of an engine, the engine is called:

A. Rotary engineB. Steam engineC. Two-stroke engineD. Four-stroke engine

169. What occurs in a reversible polytropic process?A. Enthalpy remains constantB. Internal energy does not changeC. Some heat transfer occursD. Entropy remains constant

170. In a deepwell installation or operation, the differencebetween static water level and operation water l evel is

called:

A. Suction liftB. DrawdownC. Priming levelD. Clogging

171. What characteristic an impulse turbine?A. Steam striking blades on angleB. No steam reaction to velocityC. Steam striking blades at zeroD. Steam reversing direction

172. Air receive in a compressed air plant must be:A. Without pressure gaugesB. Vented to the atmosphereC. Rectangular in shapeD. Installed with safety valve and drain

valve

173. A gas which will not be found in the flue gasesproduced by the complete combustion of fuel oil is:

A. Carbon dioxideB. HydrogenC. OxygenD. Nitrogen174. Scale in boiler can:

A. Create low steam qualityB. Cause foamingC. Overheat blow-off lineD. Inhibit circulation and heat transfer

175. The effectiveness of a body as a thermal radiator at agiven temperature.

A. AbsorptivityB. EmissivityC. ConductivityD. Reflectivity

176. In a cooling tower, the water is cooled mainly by:A. CondensationB. EvaporationC. ConvectionD. Conduction

177.

Where is lithium bromide used in a refrigerationsystem?

A. Condensate return lines


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B. AbsorbersC. Centrifugal compressorsD. Ion exchangers

178. Amount of heat liberated by the complete combustionof a unit weight or volume of fuel is:

A. Heating valueB. Latent heatC. Sensible heatD. Work or compression

179. A temperature above which a given gas cannot beliquefied:

A. Cryogenic temperatureB. Vaporization temperatureC. Absolute temperatureD. Critical t emperature

180.181. When fuel oil has a high viscosity, we mean that the

fuel oil will:

A. Evaporate easilyB. Have a low specific gravityC. Bum without smokeD. Flow slowly through pipes

182.183. In a refrigeration system, the heat absorbed in the

evaporator per kg mass of refrigerant passing through

is:

A. Equals the increase in enthalpyB. Does not depend on the refrigerant

used

C. Is decreased if pre-cooler is usedD. Equals the increase in volume

184. Air that controls the rate of combustion in thecombustion chamber is known as:

A. Secondary airB. Excess airC. Control airD. Primary air

185. An after cooler on a reciprocating air compressor isused primarily to:

A. Cool the lubricating oilB. Condense the moisture in the

compressed air

C. Improve the compressor efficiencyD. Increase the compressor capacity

186. In a hydro-electric plant using a francis turbine withmedium head, the speed can be regulated by using the:

A.

Deflector gateB. NozzleC. Wicket gateD. Weir

187. To protect adequately the engine bearings, what typesand better arrangement of lubricating oil filter is most

practical?

A. Full-flow type installed between thelubricating oil pump and the bearing

B. Duplex filter installed before thelubricating pump

C. By pass filter with cleanable andreplaceable elements

D. Splash lubricating system in thecrankcase

188. In radiation, the heat transfer depends on:A. TemperatureB. Heat raysC. Heat flow from cold to hotD.

Humidity

189. The main purpose of a subcooler in a refrigeratingsystem especially a 2-stage system is to:

A. Increase the heat rejection per ton andavoid system shutdown

B. Improve the flow of evaporator gasper ton and increase the temperature

C. Reduce the total power requirementsand return oil to the compressor

D. Reduce the total power requirementsand heat rejection to the 2

ndstage

190. The performance of a reciprocating compressor can beexpressed by:

A. Adiabatic work divided by adiabaticinput

B. Adiabatic work divided by indicatedworkC. Isothermal work divided by indicated

work

D. Isothermal work divided by adiabaticwork

191. A reciprocating pump is considered positivedisplacement pump because:

A. Displacement of the liquid is affectedby the displacement of the piston

B. Positive pressure is given to the liquidC. Liquid is discharge with positive

pressure

D. Liquid is lifted due to the vacuumcreated inside the cylinder

192. A change in the efficiency of combustion in a boiler canusually be determine by comparing the previously

recorded readings with the current readings of the:

A. Stack temperature and COB. Over-the-fire-draft and COC. Ringelman chart and CO2 D. Stack temperature and CO2

193. A boiler stream gauge should have a range of at least:A. One-half the working steam pressureB. 1 times the maximum allowable

working pressure

C. The working steam pressureD. Twice the maximum allowable

working pressure

194. A manometer is an instrument that is used to measure:A. Air pressureB. Heat radiationC. Condensate water levelD. Air volume

195. Pres. F. V. Ramos approved on February 12, 1998 aRepublic Act, which is an act to regulate the practice of

Mechanical Engineering in the Philippines, otherwise

known as the M.E. Law. What is this act:

A.

RA No. 9845B. RA No. 8495C. RA No. 8594D. RA No. 8945

196. The relationship of water vapor in the air at the dewpoint temperature to the amount that would be in the air

if the air were saturated at the dry bulb temperature:

A. Partial pressure actual at dew pointB. Percentage humidityC. Relative humidityD. Partial pressure of water

197. What is the color code of air pipeline:A. Light blueB. RedC. BrownD. Violet

198. The CO2(carbon dioxide) percentage in the flue gas ofan efficiently fired boiler should be approximately:

A. 1%B. 12%C. 18%D. 20%

199. An unloader is used in air compressor to:A. To relief air pressureB. Start easierC. Stop easierD. Run faster

200. How many pounds of air theoretical needed to burn onepound of diesel fuel oil:

A. 28B. 14C. 18D. 22

201. Which of the following is a great advantage of a firetube-tube boiler:

A. Steam pressure is not steadyB. Contains a large volume of water and

requires long interval of time to raise

steam and not so flexible as to changes

in steam demand

C. Cannot use impure waterD. Radiation losses are higher because fire

is on the boiler and is surrounded by

water

202. What should be the temperature of both the water andsteam whenever they are present together:

A. Saturation temperature for the existingpressure

B. Boiling point of water at 101.325 KPaC. Superheated temperatureD. One hundred degree centigrade

203. One of the following tasks which is an example ofpreventive maintenance is:

A. Cleaning the cup on a rotary cup burnerB. Cleaning a completely clogged oil

strainer

C. Replacing a leaking valveD. Replacing a blown fuse

204. An air current in a confined space such as that in acooling tower or chimney is called:

A. Variable flowB. Velocity profileC. Velocity gradientD. Draft

205. What kind of a heat exchanger where water is heated toa point that dissolved gases are liberated:

A. EvaporatorB. CondenserC. IntercoolerD. Deaerator

206. What is the function of steam separator:A. Trapping the steam and letting water

through

B. ThrottlingC. Changing direction of steam flowD. Steam metering

207. Which of the following is not a main part of a typicalcoal burner:

A. Air registersB. A nozzleC. An atomizerD. An ignitor

208. Which of the following types of air dryers works byabsorbing moisture on a solid dissicant or dryingmaterial such as activated alumina, silicon gel, or

molecular sleve:

A. Regenerative cycleB. Deliquescent cycleC. Spray dryerD. Refrigerated dryer

209. A heat-transfer device that reduces a thermodynamicfluid from its vapor phase to its liquid phase such as in

vapor-compression refrigeration plant or in a

condensing steam power plant:

A. Flash vesselB. Cooling towerC. CondenserD. Steam separator

210. A goose neck is installed in the line connecting a steam gauge to aboiler to:

A. Maintain constant steam flowB. Protect the gauge elementC. Prevent steam knockingD. Maintain steam pressure

211. The law that states entropy of all perfect crystalline solid is zero atabsolute zero temperature:

A. Newton LawB. Third law of thermodynamicsC. First law of thermodynamicsD. Second law of thermodynamics

212. In the processing section, there is an instrument frequently used tomeasure the flow rate of fluids. What is the instrument consisting of avertical passage with variable crosssectional area, a float and calibratedscale:

A. RotameterB. Pilot tubeC. Rota- aireD. Manometer

213. How do you describe a non-flow process where in the volume remainsconstant:

A. IsometricB. IsentropicC. IsobaricD. Isenthalpic

214. A branch system of pipes to carry waste emissions away from theprison chambers of an internal combustion engine is called:

A. Exhaust nozzleB. Exhaust deflection pipeC. Exhaust pipesD. Exhaust manifold

215. Measure of ability of a boiler to transfer the heat given by the furnaceto the water and steam is:

A. Grate efficiencyB. Stocker efficiencyC. Furnace efficiencyD. Boiler efficiency

216. A major cause of air pollution resulting from the burning of fuel oils is:A. NitrousB. HydrogenC. Sulfur dioxideD. Silicon

217. An Engine indicator is generally used to measure:A. Steam pressureB. Heat lossesC. Steam cylinder pressureD. Errors in gauge reading

218. The power required to deliver a given quantity of fulid against a givenhead with no losses in the pump is called:

A. Wheel powerB. Brake powerC. Hydraulic powerD. Indicated power

220. The function of an unloader on an electric motor driven compressorto:

A. Reduce the speed of the motor when themaximum pressure is reached


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B. Drain the condensate from the cylinderC. Release the pressure in the cylinders in

order to reduce the starting load.D. Prevent excess pressure in the receiver

221. Fluids that are pumped in processing work are frequently more viscousthan water. Which of the following statements is correct:

A. Reynolds number varies directly as theviscosity

B. Efficiency of a pump increases as theviscosity increases

C. Increased fluid friction between thepump parts and the passing fluidincreases useful work

D. Working head increases as the viscosityincreases.

222. The size of the steam reciprocating pump is generally designated by athree digit number size as 646. What would be the first number designate:

A. Stroke of the pump in inchesB. Inside diameter of the steam cylinder

measured in inchesC. Percent clearanceD. Number of cylinders

223. Peak load for a period of time divided by installed capacity is: A. Capacity factorB. Demand factorC. Utilization factorD. Load factor

224. At what temperature where in an oil at any grade becomes cloudy andit freezes, thus in application is limited.

A. Cold pointB. Pour pointC. Flash pointD. Freezing point

225. A turbine pipe determined its nominal size refers to:A. Inside diameterB. Outside diameterC. Approximate diameterD. Pipe wall thickness

226. If the exhaust lowered or the boiler is raised the moisture content ofsteam:

A. VaporizesB. DecreasedC. LiquefiesD. Increase

227. The relative humidity become 100% and where the water vapor startsto condensate.

A. Critical pointB. Dew pointC. Saturated pointD. Cold point

228. For reciprocating compression slip at positive displacement.A. Cd = 1B. Cd < 1C. Cd > 1D. Cd = 0

229. A temperature measurement in an ordinary thermometer which has

constant specific humidity.

A. Critical t emperatureB. Dry bulb temperatureC. Dew point temperatureD. Wet bulb temperature

230. For reciprocating compressor slip at negative displacement:

A. Cd>1B. Cd


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269. What is the value of the Mach number at the throat of a converging

diverging nozzle?

A. ZeroB. OneC. TwoD. Ten

270. For a double acting reciprocating pump, there are two suction strokes

for every revolution of the crank wheel. How many delivery strokes does it

have?

A. 4B. 3C. 2D. 1

271. Which of the following materials is suitable for tubing in refrigeration

application where refrigerant ammonia is employed.

A. PlasticB. BrassC. SteelD. Copper

272. What do you call a conversation technology that yields electricity

straight from sunlight without the aid of a working substance like gas or

steam without the use of any mechanical cycle?

A. Power conservationB. Sterling cycle conversionC. Solar thermal conversionD. Photovoltaicenergy conversion

273. If the composition of hydrocarbon fuel is known, the ratio between the

nitrogen and oxygen that is supplied in air i s:

A. EqualB.

Intensity

C. ConstantD. Fixed

274. Which of the following is a reason for a motor head loss in long pipe?

A. PressureB. FrictionC. VelocityD. Elevation

275. The engineer was tested to design the air conditioning system, for a

ballroom dance hall. Consider that this involve a lot of activity from its

users, the engineer would design that will require _____.

A. Maximum attainable effectiveB. Higher effective temperatureC. Constant effective temperatureD. Lower

276. The minimum amount of air required for a complete combustion of

fuel is called:

A. 90% airB.

Theoretical air

C. Excess airD. 110% air

277. For pipes extending more than 1000 times its diameter, what major

losses of hydraulic head due to?

A. Cross-sectional changeB. VelocityC. FrictionD. Pressure

278. When change in kinetic energy of a compressed gas are negligible or

insignificant, the work input to an adiabatic compressor is ____.

A. NegligibleB. Equal to zeroC. Equal to change in enthalpyD. Infinity

279. If the actual kinetic energy of a nozzle is Ka and Ki is the maximum

value that can be attained by an isentropic expansion from initial to finalstate, then efficiency of a nozzle is:

A. Ka/Ki

B. Ka x KiC. Ki = KaD. Ki/ Ka

280. Which of the following has the minimal effect on the penetration of the

air in the combustion chamber?

A. Jet velocityB. Fuel viscosityC. Orifice sizeD. Air density

281. Which of the following component of a pump converts mechanical

energy to pressure energy?

A. ImpellerB. ShaftC.

Valve

D. Delivery pipe282. The convergent section of a nozzle increases the velocity of the flow of

the gas. What does it do on its pressure?

A. Pressure becomes constantB. decrease the pressureC. increase the pressureD. pressure is equal to viscosity

283. What is the specific humidity of air?

A. 150B. 50C. 100D. 0

284. Flow of fluids wherein its particles do not have definite paths and the

paths of individual and distinct particles cross one another is:

A. Nonuniform flowB. Laminar flowC. Unsteady flowD.

Turbulent flow

285. When hot soup was served in a cup during dinner, an engineer was so

eager to drink it. Since it was hot, he added cubes of ice to cool the soup

and stirred it. He noticed that dew starts to form on the outermost surface of

the cup. He wanted to check the temperature of the outermost surface of the

cup. What is the temperature equal to?

A. Superheated temperatureB. Standard temperatureC. Equal to zeroD. Equal to airs dew point temperature

286. Both Stirling and Ericsson engines are:

A. Internal combustion engineB. Carnot engineC. External combustion engineD. Brayton engine

287. Heat transfer processes which include a change in phase of fluid areconsidered:

A. ConvectionB. ConductionC. Thermal radiationD. Radiation

288. In a closed vessel, when vaporization takes place, the temperature rises

due to the rising temperature, the pressure increases until equilibrium is

established between the temperature and pressure. The temperature of

equilibrium is called.

A. Dew pointB. Superheated temperatureC. Ice pintD. Boiling point

289. When in the products of combustion is in li quid form, the heatingvalue is known as:

A. Higher heating valueB. Lower heating valueC.

Low and medium heat value

D. Lower and heat value

290. Nozzles do not involve any work interaction. The fluid through this

device experiences.

A. No change in potential energyB. VacuumC. No change in kinetic energyD. No change in enthalpy

291. In the absence of any irreversibility, thermoelectric, generator, a device

that incorporates both thermal and electric effects, will have the efficiency

of a. Answer: A

A. Carnot cycleB. Diesel cycleC. Otto cycleD. Rankine cycle

292. At steam point, the temperature of water and its vapor at standard

pressure are.

A. In its maximumB. In equilibriumC. UnityD. Zero

293. When can a Francis turbine obtain a correct disposition of the moving

blades and the guide?

A. At half loadB. At any loadC. At full load onlyD. At all loads

294. A rapid increase in boilers pressure occurs when there is,

A. Moderate drop in steam loadB. Abrupt drop in steam loadC. Constant drop in steam loadD. Gradual drop in steam load

295.Which of the following determines the effectiveness and size of the

condenser?

A. Number of passesB. Tube sizesC. Thickness of the shellD. Heat transfer

296. What do bodies at a temperature above absolute zero emit?

A. EnergyB. Thermal radiationC. Heat of convectionD. Heat of compression

297. A refrigerant control in a refrigeration system that is used to prevent

the flow refrigerant gas from the condenser back to the compressor during

off cycles is:

A. Check valveB. Hold-back valveC. Solenoid valveD. Safety valve

298. A device used in steam power plant which is required on engine andturbine exhaust casings, on condensers and heater shells or on area where it

is possible to have pressures higher than the design pressure of the castings,

is a.

A. Steam holdback valveB. Steamgenerator safety valveC. Pressureoperated check valveD. Relief valve

299. A body that is hot compared to its surroundings illuminates more

energy than it receives, while its surroundings absorb more energy than they

give. The heat is transferred from one body to another by energy wave

motion. What is this mode of heat transfer?

A. RadiationB. ConvectionC. ConductionD. Condensation

300. An engineer inspected an air conditioning unit. He found that the unit

does not produce any cooling effect, however, the air conditioning unit is

running. He checked the temperatures of the condenser and evaporator and

had the unit run. He found out that there was no change in the temperature.What should he do?

A. Replace fuse

B. Replace relayC. Charge with new refrigerantD. Adjust door seal

301. Dirt and foreign materials normally build up on the side of the

condenser tubes. To ensure adequate condenser capacity, a certain factor is

used in calculating the overall heat transfer through the walls of the tubes

including the heat transfer rate of the layers of dirt and foreign materials.

What is this factor called?

A. BoosterB. Factor of safetyC. Fouling factorD. Compression factor

302. Dry air can be approximately _____ % Oxygen and _____ % Nitrogen

by mole numbers.A. 30% / 70%B. 21% / 79%C. 70% / 30%D. 79% / 21%

303. Which of the following is the preferred criterion for a high speed

engine?

A. Higher internal stressB. High rpmC. Low piston speedD. High mean piston speed

304. In order that cavitation will not take place in the suction line of a

pump, what should be t he sum of the velocity head and pressure head at

suction compared to the vapor pressure of the liquid?

A. Sufficiency lowerB.

Adequately greater

C. ConstantD. Equal

305. What is the part of an oil pressure governor that is used to continuously

draw oil for as the turbine is working?

A. Speed governorB. Governing deviceC. ServometerD. Gear pump

306. A hot block is cooled by blowing cool air over its top surface. The heat

that is first transferred to the air layer close to the block is by conduction. It

is eventually carried away from the surface by:

A. ConvectionB. ConductionC. RadiationD. Thermal radiation

307. In Sterling and Ericsson cycle, regeneration can:

A. Hinder efficiencyB.

Decrease efficiency

C. Increase efficiencyD. Limit efficiency

308. The most economical and low maintenance cost condenser,

A. WatercooledB. Air cooledC. EvaporativeD. Subcooled

309.The ___ are under the T-S diagram.

A. EntropyB. EnergyC. Heat addedD. Work

310. A boiler feed pump has enough capacity to deliver feedwater heater to

a boiler. If you are the engineer of such power plant, how many pumps of

the same capacity are you recommended to install?

A. 1B. 2C. 3D.

4


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311. In order to avoid cavitation the NPSH of an installation should be at

least _____________ the NPSH of pump.

A. Equal or greater than 1B. Less than 1C. Always less than 1D. None of these

312. Mr. De la Cruz wanted to buy a pump for his farm. What is suitable for

deepwell?

A. ReciprocatingB. Air liftC. Hand liftD. EjectorCentrifugal pump

313. Swamp gas ( vegetable decay )

A.

PropaneB. OctaneC. MethaneD. Ethane

314. High head turbine

A. ImpulseB. FrancisC. PropellerD. None of these

315. Used for deepwell installation.

A. RotaryB. ReciprocatingC. CentrifugalD. Screw type

316. In a two phase system, 30% moisture means.

A. 70% liquid and 30% vaporB. 100% liquid and 30% vaporC. 70% vapor and 30% liquidD.

None of these

317. What is the basis of continuity of flow?

A. Energy balanceB. Mass balanceC. Bernoulis equationD. None of these

318. First Law of thermodynamics states.

A. Entropy change is zeroB. Conservation of energyC. Heat entering all converted to workD. None of these

319. An impulse turbine has.

A. Low headB. High headC. Medium headD. None of these

320. In two revolution in a four stroke engine how many cycle.

A. ThreeB.

Twice

C. 4 timesD. Once

321. Is the heart of refrigeration system?

A. CondenserB. Expansion waveC. EvaporatorD. Compressor

322. Number that is use to determine if the fluid is laminar flow or turbulent

flow.

A. Number factorB. Reynolds numberC. Mach numberD. Froude number

323. An engineer found that the fluid flowing in the pipe is low. What

diameter of pipe should be recommended in order to increase the speed?

A. Increase the diameterB. Reduce the diameterC.

Constant diameterD. None of these

324. Boiling temperature of water is:

A. 273KB. 32FC. 100CD. 212K

325.Gas turbine will depend its temperature at:

A. Allowable maximumB. Maximum valueC. Allowable minimumD. None of these

326. Sugar removes molasses by:

A. FiltrationB.

Condensation

C. SeparationD. None of these

327. Exit of impulse turbine casing pressure:

A. Above atmB. Below atmC. VacuumD. None of these

328. Exit of turbine way:

A. Tail raceB. Split wayC. DamD. None of these

329. When there is a reduction on humidity ratio:

A. HumidifyingB. DehumidifyingC. CoolingD. Heating

330. An engineer found that the glass of the window is frosted in the

morning. What is the cause of this frosting?

A. Low humidity in the roomB. High humidity in the roomC. Air movementD. Low humidity outside the room

331. What is the heat represent for 1 Kmol of fuel?

A. Enthalpy of reactionB. Enthalpy of formationC. Internal energy of reactionD. Enthalpy of combustion

332. If area is contact to liquid and P is wetted perimeter, what is the

hydraulic mean depth?

A. P/AB. A/PC. P + AD. P(A)

333. to prevent backflow of refrigerant from condenser to compressor the

valve to be install must be:

A. Expansion valveB. PurgerC. Check valveD. Relief valve

334. What energy used in reaction turbine?

A. Hydraulic energyB. Water energyC. Kinetic energyD. Dynamic energy

335. At low temperature, a good lubricant.

A. Free from waxB. TolerableC. Free from combustionD. None of these

336. Water converted to steam. What type of hydrothermal power plant?

A.

Geo pressured systemB. Vapor dominatedC. Liquid dominated

D. None of these337. An engineer want to maintain the temperature in the room. Air

entering must warned to.

A. Lower than indoorB. Equal to indoorC. higher than indoorD. outdoor is lower than indoor

338. If the number of reheating stages increases in Rankine cycle, the

average temperature increases.

A. All in the cycleB. In the turbineC. In the reheatingD.

None of these

339. In Brayton cycle with regeneration, the efficiency will.

A. IncreaseB. DecreaseC. Remains constantD. None of these

340. In a polytropic process, the P V diagram has graph. What is the

indication of n?

A. Indicate heatB. Indicate workC. Indicate stiffness of curveD. Pressure x volume

341. Work in ______________.

A. Power interactionB. Energy interactionC. PowerD. Kinetic energy

342. A valve that is used to determine the level of refrigerant.A. Float valveB. Glove valveC. Foot valveD. Relief valve

343. Type of switch put in flooded system that actuate the predetermined

level of refrigerant.

A. toggle switchB. float switchC. firing switchD. fuse

344. In a diesel cycle, if cut off ratio decreases, what happened to the

cycle efficiency?

A. increaseB. decreaseC. remains constantD. none of these

345. What process where most of the heat is added in Sterling cycle?A. constant volumeB. constant temperatureC. constant pressureD. constant entropy

346. If the steam condition is about to condense, it is.

A. saturated vaporB. super saturatedC. subcooledD. superheated

347. Measure the flow of refrigerant.

A. speedometerB. velometerC. venturi meterD. pilot tube

348. If = velocity of air and = velocity of sound, the Mach number is.A. /B. /C.

D. +

349. In order to compensate the work of compressor in Brayton cycle, what

size of turbine to be used.

A. Large turbineB. Small turbineC. Medium turbineD. None of these

350. For steady flow, what is the velocity at the side of wall pipe.

A. MaximumB. MinimumC. Approaches zero canD. Approaches infinity

351. Cycle used for aircraft.

A. Combine cycleB.

Diesel cycle

C. Otto cycleD. Jet propulsion

352. If a plant has an electric precipitator, what is the function of this

device?

A. Collect fuelB. Collect informationC. Collect dustD. Collect moisture

353. What is the energy used in reaction turbine?

A. Hydraulic energyB. Kinetic energyC. Water energyD. Dynamic energy

354. If the temperature of body cannot overcome temperature of resistance

of air, what is the mode of heat transfer?

A. RadiationB.

Conduction

C. ConvectionD. None of these

355.What cycle that is a function of temperature?

A. Carnot cycleB. Brayton cycleC. Diesel CycleD. Otto Cycle

356. In spark ignition, during combustion, where is the piston position?

A. Away from the top centerB. Away from the bottom dead centerC. At top dead centerD. Approaching TDC

357. A heat engine operating at reversed in refrigeration unit is:

A. RefrigeratorB. RegeneratorC. Heat pumpD. Humidifier

358. Boyles law states that if the temperature is constant, the volume is

inversely proportional to.

A. EntropyB. WorkC. Internal energyD. Pressure

359. Which is cheaper?

A. Two stroke engineB. Stirling engineC. Four stroke engineD. Carnot engine

360. If there is no heat exchange in the system, it is.

A. AdiabaticB. PolytropicC. DiabaticD. Isochoric

361. If work of the process is zero, the process is.

A.

Constant volumeB. Constant entropyC. Constant t emperature


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D. Constant pressure362. Force of water that strikes the turbine/

A. Water forveB. Dynamic forceC. Static forceD. Force

363. For a pump that has a nameplate of 8 x 6 x 10, what is the bore of

the cylinder?

A. 8B. 6C. 8 and 6D. 10

364. Water converted to steam. What type of hydrothermal power plant?A. Geo pressurized steamB. Lquid dominatedC. Vapor dominatedD. None of these

365. In a polytropicprocess , the process becomes constant volumewhen n is _____/

A. ZeroB. InfinityC. 1.0D. Maximum

366. Two pumps installed in parallel, what is the discharge if each pump

delivers Q.

A. QB. 3QC. 2QD. 4Q

367. How are you going to improve the engine power?

A. Increase combustion timeB. Increase combustion chamber volumeC. Decrease combustion chamber volumeD. Increase piston diameter

368. How are you going to reduce moisture by desiccation?

A. Less cooling powerB. Decrease air volumeC. Maintain the right relative humidityD. Less oxygen

369. Temperature at which air start to condense.

A. Pour pointB. Dew pointC. Wet bulbD. Dry bulb

370. When dry bulb and wet bulb temperatures are the same, its relative

humidity is:

A.

0 %B. 50%C. 100%D. 75%

371. What type of heat transfer if there is a density differential of fluid?

A. ConvectionB. RadiationC. ConductionD. None of these

372. Air carried heat transfer by evaporation and _______.

A. ConvectionB. RadiationC. ConductionD. None of these

373. Type of refrigeration system chilled or cool the water in the

evaporator.

A.

Chilled waterB. Vapor compressionC. Direct expansion

D. Direct system374. There are two reservoirs are installed at different elevation. One fluid

is transferred to another reservoir, what type of head loss at discharge?

A. FrictionB. Velocity headC. Pressure headD. Hydraulic head

375. Device used to remove or separate moisture.

A. RectifierB. GeneratorC. CondenserD. Evaporator

376. What is the vertical height when pump discharges to certain height.

A. Static headB. Gross headC. Net headD. Potential head

377. What cycle create spark ignition?

A. OttoB. DieselC. BraytonD. Carnot

378. Use to increase pressure while the velocity decreases.

A. NozzleB. DiffuserC. Pitot tubeD. Venturi meter

379. If it is supersonic flow, what is the Mach number?

A. Less than 1B. Greater than unityC.

Less than 0

D. None of these

380. what is the reason of reheating the steam in Rankine cycle?

A. Due to excessive moistureB. Due to less moistureC. Due to high qualityD. Due to superposition

381. In the absence of any work interaction between system and its

surroundings, the amount of heat transfer is equal to the ________.

A. Change of temperature of open cycleB. Change of energy at closed cycleC. Change of temperature of closed cycleD. Change of energy at open cycle

382. Combine the cooling tower and condenser, what type of condenser is

this?

A. Evaporative condenserB. Indirect contact condenserC.

Direct contact condenserD. Air cooled condenser

383. One use of condenser is to decrease the back pressure that convert

steam to liquid.

A. Shell and tubeB. WatercooledC. Air cooledD. Oil cooled

384. Device used to ventilate, circulate and opposing the pressure.

A. BlowerB. DuctC. CompressorD. Pump

385. Two pumps are connected in series. One pump has a head of andcapacity . Second pump has a head of and capacity of . What is thehead relation if is less than ?

A. 2 times B. /C.

+ D. -

386. By increasing the average temperature during heat addition of power

per cycle, what happened to the thermal efficiency?

A. IncreaseB. DecreaseC. ConstantD. None of these

387. What is the regulator valve location in refrigeration system?

A. Condenser inletB. Condenser outletC. Suction of compressorD. Discharge of compressor

388. An inert gas that do not react during combustion.

A. OxygenB. NitrogenC.

Carbon

D. Hydrogen389. In the product of combustion, if oxygen is not enough, what is the

result of the product?

A. Carbon trisulfideB. Carbon monoxideC. Carbon sulifideD. Carbonate

390. Is the heat supplied per degree temperature unability.

A. Internal energyB. EnthalpyC. EntropyD. Flow work

391. Amount of heat absorbed in the evaporator.

A. Compressor powerB. Heat rejectedC. Refrigerating effectD. None of these

392.

is the process called.A. IsentropicB. PolytropicC. IsothermalD. Isobaric

393. Viscosity can be measured by.

A. PressureB. TemperatureC. Thickness of oilD. Density

394. Parameter use to determine the capacity of air to hold moisture in air.

A. RHB. Saturation pressureC. TemperatureD. Density

395. Is the property of lubricant that will start burning.

A. Pour pointB. Fire pointC. Solid pointD. Flash point

396. From one point to another, what type of flow that has a flow

characteristics of change in width and change in height.

A. Nonuniform flowB. Nonsteady flowC. Unsteady flowD. None of these

397. At one point of pipe, the steady flow was checked many times, the

velocity is/are:

A. ConstantB. UniformC. EqualD. None of these

398. What do you call the difference in temperature of water inlet and the

outlet of cooling tower? A. Temperature approachB. Equilibrium temperature

C. Mixing temperatureD. Temperature range

399. To maintain equilibrium in condenser, what is the relation of cooling

water temperature differential to the temperature difference in condenser.

A. EqualB. Much lesserC. LesserD. Greater

400. In steady flow, the volume at suction, _______________ at any time,

A. EqualB. ConstantC. UniformD. Unsteady

401. For steam power plant to operate, the working must exchange heatwith the surroundings and the furnace.

A. KelvinPlancB. First law of thermodynamicsC. Kirchoffs lawD. New second law

402. In food storage, to minimize desiccation, maintains the temperature

and ______.

A. Input of OxygenB. Control relative humidityC. AirflowD. None of these

403. Multi staging type of refrigeration:

A. Vapor compression cycleB. Cascade refrigerationC. Absorption refrigerationD. Aircycle refrigeration

404. When RH = 100% its temperature is.

A.

Dew pointB. Saturation temperatureC. Critical temperatureD. None of these

405. Room air conditioning needs more outside air.

A. Air cooledB. Water cooledC. Shell and tubeD. None of these

406. Instrument used to measure fluid velocity

A. Pilot tubeB. Orsat apparatusC. Venturi meterD. Manometer

407. It prevents the refrigerant from the condenser to go back to the

compressor.

A. Check valveB. Float switchC.

Expansion valveD. Low side float

408. Gauge cock in the boiler is designed to determine.

A. Water levelB. Water pressureC. Expansion valveD. Low side float

409. The ideal cycle based on the concept that the combustion process is

both diesel and gasoline in the combination of heat transfer process that is

constant pressure and constant volume.

A. Ericsson cycleB. Dual cycleC. Brayton cycleD. Rankine cycle

410. What is the value of air stratification in air conditioning design fit for

human comfort?

A. MinimumB.

MaximumC. Less than air temperature

D. Equal to air temperature


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411. If PV is the power required for a vapor compression refrigeration

system, then what is the power required for an air refrigeration system,

assuming that they have the same capacity?

A. 5 PVB. 2 PVC. PV/10D. 1/PV

412. If the velocity of fluid passing through a pipe is constant, the flow is

said to be.

A. Steady flowB. Unsteady flowC. Uniform flowD. Nonuniform flow

413. If the system is in equilibrium with the surroundings.

A. ReversibleB. IrreversibleC. Dead stateD. Critical

414. When there is a release amount of energy from one energy level to

another level, it is.

A. Quantum theoryB. Daltons lawC. Charles lawD. Ideal gas law

415. If the pressure ratio of Otto cycle increases, the cycle efficiency will.

A. IncreaseB. DecreaseC. Remains constantD. None of these

416. Water flows thru rectangular channel. What is the height (w) at

maximum flow? A. L/2B. w/2C. 2wD. 2L

417. System with sulfur dioxide.

A. Can corrode metals cannot be used inhospitals

B. Cannot be used in hospitalsC. Can help the systemD. None of these

418. What cycle that has combustion but no compression?

A. BraytonB. StirlingC. OttoD. Diesel

419. In a reaction turbine or impulse turbine, the energy developed is.

A. Mechanical energyB.

Kinetic energyC. Potential energy

D. Work420. A pump that has 1 impeller, the number of stages is:

A. SingleB. DoubleC. TripleD. Quadruple

421. If every other stroke there is compression, it is.

A. 4strokeB. Double strokeC. Single actingD. Double acting

422. A cycle that has intercooling, reheating and regeneration.

A. Stirling cycleB. Brayton cycleC. Gasoline cycleD. Carnot cycle

423. Two pumps are connected in series. If is discharge of Pump 1 andis the discharge of Pump 2 where what is the discharge?

A. B. C. + D. /

424. What cycle is used for vapor cycle in power plant?

A. Brayton cycleB. Diesel cyckeC. Ericsson cycleD. Rankine cycle

425. What is the BTU/hr equivalent for 1 horsepower?

A. 778B. 2545C. 746D. 3.41

426. If is the actual discharge flow and is the theoretical dischargeflow, what will be the coefficient of discharge be equal to during positive

displacement slip?

A. x B. /C. /D. 1 - /

427. What is the unit of electromagnetic wave frequency?

A. VoltsB. HorsepowerC. HertzD. Knot

428. At 101.325 kpa, the boiling point of water is 100C. If the pressure is

decreased, the boiling temperature will.

A. IncreaseB. DecreaseC. Remain the sameD. None of these

429. The temperature at which lubricating oil form a cloud.

A. Cold pointB. Pour pointC. Critical pointD. Boiling point

430. What is the pressure above zero?

A. Gage pressureB. Absolute pressureC. Vacuum pressureD. Atmospheric pressure

431. Tidal power is attractive because it has:

A. Low head and intermittent powerB. High headC. Cheap energy sourceD. Expensive energy

432. R-22 is.

A. DichlorodifluoromethaneB. MonochlorodifluoromethaneC. Mythyl chlorideD. Trichlorodifluoromethane

433. One N-m is equal to one.

A. JouleB. BtuC. CalorieD. Kg-m

1.Device for converting heat transfer to work are called:A. Piston cylinderB. Heat pumpsC. Heat enginesD. Carnot engines

2.Use to measure the performance of the engine is:A. EfficiencyB. RatioC. EffectivenessD. COP

3.Internal combustion use the ignition of combustible fuel withinthe engine itself as the source of energy which is partially

converted into:

A. PotentialB. KineticC. WorkD. Heat

4.Heat is transferred during _________in carnot cycle:A. Isometric processB. Isentropic processC. Isobaric processD. Adiabatic process

5.During the isentropic compression of carnot cycle, the pressure:A. DecreasesB. IncreasesC. Remains constantD. None of these

6.During the isentropic expansion of carnot cycle, the pressure:A. DecreasesB. IncreasesC. Remains constantD. None of these

7.The temperature during the heat rejection in carnot cycle isknown as:

A. Temperature sourceB. Temperature sinkC. Temperature maximumD. Temperature crest

8.The efficiency of carnot cycle depend mainly in.A. Absolute temperatureB. Isentropic expansionC. Isentropic compressionD. Temperature ranges

9.The net area under T-S diagram of carnot cycle is.A. HeatB. EnergyC. WorkD. Entropy

10.Mean effective pressure is the ratio of net work and ______.A. Mean volumeB. Volume displacementC. Volume differenceD. Control volume

11.A Carnot cycle has two isothermals and two ________.A. Polytropic processB. Isentropic processC. Adiabatic processD. Irreversible process

12.Stirling cycle uses a ___________ as working fluids.A. Incompressible gasB. Incompressible fluidsC. Compressible refrigerantD. Compressible fluids

13.Stirling cycle has two isothermals and two constant.A. Volume processB. Pressure processC. Temperature processD. Entropy process

14.In stirling process the heat is added during.A. Isobaric processB.

Isentropic process

C. Isothermal processD. Heat process

15.A chamber containing wire or ceramic mesh or fine metallicgauze and is used for the temporary storage of

__________.

A. PowerB. EnergyC. WorkD. Air

16.The energy stored and released by the regenerator is known as:A. Kinetic energyB. Potential energyC. Internal energyD. Heat energy

17.The efficiency of stiring cycle is the same as that of__________ efficiency.

A.

Brayton cycleB. Ericsson cycleC. Gasoline cycleD. Carnot cycle

18.The ericsson cycle has two isothermal and two constant.A. Isentropic processB. Reversible processC. Adiabatic processD. Pressure process

19.The heat exchanger used in an Ericsson cycle is known as.A. ReheaterB. BoilerC. Heat exchangerD. Recuperator

20.The energy exchanger process in Erirsson cycle takes placeduring.

A. Isothermal processB. Isobaric processC.

Isothermal processD. Isentropic process

21.The greatest network output per cycle in Stiring cycle isobtained with the smallest pressure ratio across the

turbine; the greatest volumetric expansion ratio and

operating at the highest temperature at

A. Turbine inletB. Turbine outletC. Reheater inletD. Reheater outlet

22.Brayton cycle is also known asA. Carnot cycleB. Joule cycleC. Diesel cycleD. Rankine cycle

23.The heat in Brayton cycle is added during _________.A. Isothermal processB. Steady flow processC. Any processD. Isobaric process

24.The Brayton cycle has isobaric and two ___________.


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A. Adiabatic processB. Isothermal processC. Isentropic processD. None of these

25.The efficiency of the closed-cycle Brayton engines is found todepend on the __________.

A. Temperature onlyB. Pressure onlyC. Volume onlyD. Entropy only

26.If the inlet pressure to the turbine increases, the inlettemperature to the turbine will also _________.

A. IncreasesB.

DecreasesC. Remains constant

D. None of these27.Higher inlet pressure and temperature to the turbine as well as

a larger temperature ratio, resulting from greater heat

transfer per cycle, ___________per cycle.

A. Will decrease mean effective pressureB. Will decrease workC. Will increases the mean effective

pressure

D. Will increase work28.The _________ is the ratio of compressor work input to the

turbine work output.

A. Heat ratioB. Specific heat ratioC. Energy ratioD. Work ratio

29.As the work ratio approaches unity, the network output of thebrayton engine approaches.

A.

ZeroB. InfinityC. Maximum valueD. None of these

30.If the turbine and/or compressor efficiency becomes lowenough, the efficiency of the cycle can become zero and

the work ratio can exceed _________ in gas turbine.

A. InfinityB. ZeroC. UnityD. Negative

31.A recuperation can ____________ of Brayton cycle.A. Hider efficiencyB. Improved the efficiencyC. Limit the efficiencyD. Minimized the efficiency

32.The total energy of the gas leaving the turbine is minimized sothat the tubine work output is___________.

A. MaximizedB. MinimizedC. ZeroD. Infinity

33.Is applied to propulsion of vehicles because of certain practicalcharacteristics.

A. Diesel cycleB. Otto cycleC. Carnot cycleD. Brayton cycle

34.The ____________ has the general advantage of being able toburn fuels that r equired little refining and having few

moving parts.

A. Automotive gas-turbine engineB. Turbo-engineC. CAD engineD. None of these

35.Aircraft Brayton cycle engines is also known as:A. TurbojetB. PropjetC. Fighter jetD. Bomb jet

36.Is commonly used stationary power plants,A. Carnot cycleB. Three cycleC. Brayton cycleD. Diesel cycle

37.Otto cycle has two constant volume and two ___________.A. Polytropic processB. Adiabatic processC.

Isothermal processD. Isentropic process

38.The heat added in Otto cycle is during,A. Constant temperature processB. Constant volume processC. Heating processD. None of these

39.The efficiency of Otto cycle is dependent on the _________only.

A. Temperature ratioB. Expansion ratioC. Cut-off ratioD. Compression ratio

40.Exhaust stroke of gasoline engine is also known as,A. SuperchargingB. ScavengingC. TurbochargingD. Charging

41.Under steady operation, the mass flow rate of each fluid streamflowing through a heat exchanger.

A. IncreasesB. DecreasesC. Remains constantD. None of these

42.Heat exchanger typically involveA. No work interactionsB. No heat interactionsC. No energy interactionsD. None of these

43.When the entire heat exchanger is selected as control volume,heat becomes

A. ZeroB. MaximumC. InfinityD. None of these

44.If the process involved changes within the control volume withtime then is called Answer:

A. Transient flow processB. Variable processC. Control processD. None of these

45.A process will not occur unlessA. It satisfies both the first and the second

law of thermodynamics

B. It satisfies both the second and third lawof thermodynamics

C. It satisfies Zeroth law ofthermodynamics

D. None of these46.The __________ is also used in determining the theoretical

limits for the performance of commonly used engineering

system.

A. First law of thermodynamicsB. Zeroth law of thermodynamicsC. Second law of thermodynamicsD. None of these

47.Thermal energy capacity is the product ofA. Mass and specific volumeB. Mass and specific heatC. Pressure and temperatureD. None of these

48.A two phase system can the modeled as a reservoir also since itcan absorb and release large quantities of heat while

remaining at _________.

A. Constant temperatureB. Constant volumeC. Constant pressureD. None of these

49.A reservoir that supplies energy in the form of heat is called a:A. Sink

B. SourceC. ReserveD. None of these

50.A reservoir that absorbs energy in the form of heat is called:A. SinkB. SourceC. ReserveD. None of these

51.Thermal energy reservoir that supplies energy in the form ofheat is called.

A. Work reservoirB. Energy reservoirC. Heat reservoirD. None of these

52.A device that is used to convert the heat to work is called.A. AdiabatierB. RegeneratorC. Heat enginesD. None of these

53.Heat engines rejects heat to aA. Low temperature sinkB. High temperature sourceC. Medium temperatureD. None these

54.The work producing device that best fits into the definition of aheat is the.

A. Hydroelectric power plantB. Nuclear power plantC. Steam power plantD. None of these

55.The network output of a heat engines is always ___________.A. Less than the amount of heat inputB. More than the amount of heat inputC. Less than the amount of heat outputD. None of these

56.The fraction of the heat input that is converted to networkoutput is a measure of the performance of a heat engines

and is called the.

A. Thermal efficiencyB. Adiabatic efficiencyC. Effectiveness of second lawD. None of these

57.Is the ratio of desired output over the required input. A. RatioB. RequirementC. PerformanceD. None of these

58.Is the ratio of network output and the total heat input. A. Thermal efficiencyB. Bakwork ratioC. Work ratioD. None of these

59.The thermal efficiency of a heat engines is always.

A. The sameB. More than oneC. Less than unityD. None of these

60.In a steam power plant, the device where large quantities ofwaste heat is rejected.

A. To the seaB. To rivers, lakes or the atmosphereC. To culvertsD. None of these

61.The energy that cannot be recycled, and it is properly called.A. Reserve energyB. Acquired energyC.

Waste energyD. None of these

62.Statement states that it is impossible for any device thatoperates on a cycle to receive heat from a single reservoir

and produce a net amount of work.

A. PlancB. CelsiusC. Kelvin-plancD. None of these

63.The transfer of heat from a low-temperature medium to a hightemperature one requires a special devices called

A. Heat pumpB. RefrigeratorC. Heat exchangerD. None of these

64.The working fluid used in the refrigeration cycle is called:A. MediumB. SteamC.

refrigerantD. None of these

65.The efficiency of refrigerator is expressed in terms of the:Answer:

A. EfficiencyB. PowerC. Coefficient of performanceD. None of these

66.The objective of refrigerator is:A. To remove heat from the refrigeratedB. To remove heat from the condenserC. To add heat from the refrigerated spaceD. None of these

67.The device that transfer heat from a low temperature mediumto a high temperature one is:

A. Heat reservoirB. AbattoirC. Heat pumpD. None of these

68.The objective of a heat pump is to maintain a heated space at:A. Low temperatureB. High temperatureC. Medium temperatureD. None of these

69.Are basically refrigerators whose refrigerated space is a roomor a building instead of the food compartment.

A. Cooling towerB. HumidifierC. Air conditionersD. None of these

70.A _________ cools a room by absorbing heat from the roomair and discharging it to the outside.

A. Centralized air-conditioning unitB. Individual unitC. Window air conditioning unitD. None of these

71.EER means?A. Energy efficiency ratingB. Energy efficiency right


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C. Efficiency entrance ratioD. None of these

72.Is the amount of heat removed from the cooled space in Btusfor W-hr of electricity consumed:

A. COPB. Energy efficiency ratingC. EfficiencyD. None of these

73.Most air conditioning have an EER between:A. 8 and 12B. 6 and 8C. 10 and 14D. None of these

74.States that it is impossible to construct a device that operates ina cycle an produces no effect other than the transfer of

heat from a lower temperature body to a higher

temperature body.

A. Clausius statementB. Planc statementC. Kelvin-planc statementD. None of these

75.A device that violates the first law of thermodynamics is calleda:

A. Perpetual motion machine of secondkind

B. Perpetual motion machine of third kindC. Perpetual motion machine of the first

kind

D. None of these

76.A device that violates the second law of thermodynamics iscalled a:

A. Perpetual motion machine of secondkind

B. Perpetual motion machine of third kindC. Perpetual motion machine of the first

kind

D. None of these77.A ______ is a process which can be reversed without leaving

any trace on the surroundings.

A. Irreversible processB. Reversible processC. Adiabatic processD. None of these

78.The process that are not reversible are called.A. Irreversible processB. Isentropic processC. Reversible processD. None of these

79.The factor that causes a process to be irreversible are called.A. IrreversibilitiesB. ReversibilitiesC. ActivitiesD. None of these

80.Any friction that involves friction is:A. ReversibleB. IrreversibleC. SteadyD. None of these

81.The heat transfer process becomes less and less irreversible asthe temperature difference between two bodies.

A. Approaches zeroB. Approaches infinityC. Approaches maximum valueD. None of these

82.A process is called ________ if no irreversible occur within theboundaries of the system during the process.

A. Internally reversibleB. Internally i rreversibleC. Cyclic processD. None of these

83.A process is called _________ if no irreversible occur outsidethe system boundaries during the process.

A. Externally reversibleB. Internally reversibleC. ReversibleD. None of these

84.The efficiency of an irreversible heat engine _________ of anreversible one operating between two reservoirs.

A. Is always more than the efficiencyB. Is always less than the efficiencyC.

Is always equal the efficiencyD. None of these

85.The efficiency of all reversible heat engines operating betweenthe same two reservoirs.

A. DifferB. Are the sameC. Are unequalD. None of these

86.A temperature scale that is independent of the properties of thesubstance that are used to measure temperature is called.

A. A thermodynamic volume scaleB. A thermodynamic temperature scaleC. A thermodynamic pressure scaleD. None of these

87.The triple point temperature is 273.16 0 K. Most workproducing devices in operation have efficiency under:

A. 30 percentB. 50 percentC.

40 percentD. None of these

88.The thermal efficiency of actual heat engines can be ________by supplying heat to the engine at the highest possible

engine at the lowest possible temperature. Answer: A

A. MaximizedB. MinimizedC. ZeroD. None of these

89.Heat transfer to a system will increase the entropy of thatsystem whereas heat transfer from the system will:


90.The energy change of a closed system equals the _______ forany process whereas the entropy change of a closed

system equals the entropy transfer only for a reversible

process.

A. Energy transferB. Heat transferC. Work transferD. None of these

91.Energy is transferred in the form of ________ whereas entropyis transferred only with heat.

A. Heat workB. EnergyC. PowerD. None of these

92.An energy intersection which is not accompanied by entropytransfer is:

A. Work transferB. Energy transferC. Heat transferD. None of these

93.An energy interaction which is not accompanied by entropytransfer is.

A. EnergyB. HeatC. WorkD. None of these

94.The entropy transfer for adiabatic system is:A. ZeroB. OneC. MaximumD. None of these

95.Is generated during an irreversible process.A. EntropyB. EnthalpyC. PressureD.

None of these96.Total entropy change associated with a process must be:

A. MaximumB. NegativeC. Positive or zeroD. None of these

97.The entropy change of a buffer zone will be:A. ZeroB. OneC. InfinityD. None of these

98.Heat transfer to a system increases the entropy of that systemand heat from a system.


99.Irreversible always cause entropy to:A.

IncreasesB. Decreases

C. Remains constantD. None of these

100.If the process involves no heat transfer, the entropy of a fixedmass must _________ during that process.


1. Improving the efficiency of an air-standard otto cycle enginesdepends chiefly on:

A. Increasing the compressionratio

B. Increasing the temperature andpressure

C. Decreasing densityD. Increasing specific

2. Increasing the piston diameter or piston stroke of otto enginewill.

A. Decrease the efficiency of theengine

B. Increases the efficiency of theengine

C. Increases the workD. Decreases the work

3. The work output per cycle also depends strongly thecompression as well as the :

A. Bore of the engineB. Isentropic compressionC. Isentropic expansionD. Volumetric displacement of

the engine

4. The mean effective pressure of otto cycle can be increased byincreasing the heat transfer into the engine per cycle or by:

A. Decreasing volumetricexpansion

B. Increasing the volumetricefficiency

C. Increasing pressure ratioD.

Decreasing pressure ratio

5. ____________ the engine in otto cycle can increase the power ofthe cycle but not to increase efficiency.

A. DischargingB. ChargingC. SuperchargingD. Scavenging

6. A ____________ is used in aircraft engines and someautomotive engine. In this method, a turbine driven by the

exhaust gases is used to provide power to compressor or blower

at the inlet.

A. DischargingB. TurbochargingC. SuperchargingD. Scavenging

7. The practical disadvantage of supercharging is that the pressureP3will be greater in the supercharge engine, resulting in?

A. ChockingB. KnockingC. TrickitingD. Blocking

8. Most supercharged of turbo-charged engines use fuel injectionof gasoline directly to?

A. Heat exchangerB. FurnaceC. RecuperatorD. Combustion chamber

9. A diesel cycle has two isentropic, one constant pressure andone?

A. Constant temperatureB. Constant volume processC. Constant densityD. None of these

10. The ideal cycles are?A. Externally reversibleB. Internally reversibleC. Externally irreversibleD. Internally irreversible

11. The thermal efficiency of an ideal cycle is less than that of atotally reversible cycle operating between?

A. Temperature decreaseB. Temperature limitsC. Temperature increaseD. None of these

12. The only devices where the changes in kinetic energy aresignificant are?

A. CompressorB. PumpsC. Nozzles and diffusersD. None of these

13. The t-s diagram is useful in the analysis ofA. Actual power cycleB. Ideal power cycle


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C. Combined power cycleD. None of these

14. Equations pertaining to steady flow systems should be used inthe analysis of?

A. Carnot cycleB. Ot

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