3B2 POWER ENGINEER EXAM PRACTICE QUESTIONS AND VERIFIED ANSWERS

3B2 POWER ENGINEER EXAM PRACTICE
QUESTIONS AND VERIFIED ANSWERS
TheA2disadvantagesA2ofA2aA2gasA2turbineA2are:A2
1.A2HighA2costA2ofA2manufactureA2
2.A2HighA2levelsA2ofA2noiseA2pollutionA2areA2producedA2
3.A2LowA2thermalA2efficiencyA2
4.A2RequiresA2manyA2auxiliariesA2toA2beA2efficient

A.A21,A22,A23
B.A21,A23,A24
C.A22,A23,A24
D.A21,A22,A24
E.A21,A22,A23,A24A2-A2Ans--E

TheA2mostA2commonA2processA2methodA2ofA2refrigerationA2is:
SelectA2one:
A.A2Absorption
B.A2LithiumA2bromide
C.A2WaterA2vapor
D.A2VaporA2compressionA2orA2mechanical
E.A2AmmoniaA2compressionA2systemA2-A2Ans--D

ToA2facilitateA2theA2removalA2ofA2moistureA2andA2oilA2fromA2theA2compressedA2air,A2a/
anA2_____A2isA2installed.
SelectA2one:
A.A2Intercooler
B.A2OilA2separator
C.A2Unloader
D.A2ExpansionA2tank
E.A2AftercoolerA2-A2Ans--E

InA2aA2two-
stageA2refrigerationA2system,A2theA21stA2stageA2compressorA2isA2alsoA2knownA2asA2aA2___
__A2compressor.
SelectA2one:
A.A2Booster
B.A2Standby
C.A2LowA2volume
D.A2Extraction
E.A2RefrigerantA2-A2Ans--A

InA2theA2rotaryA2vaneA2compressor:
SelectA2one:

,A.A2VanesA2closeA2toA2theA2centralA2hubA2byA2centrifugalA2force
B.A2ThereA2isA2aA2rotorA2inA2theA2exactA2centerA2ofA2theA2casing
C.A2RefrigerantA2isA2trappedA2betweenA2theA2rollerA2andA2theA2decreasingA2volumeA2ofA2th
eA2eccentricA2casing
D.A2TheA2rotorA2oscillates
E.A2TheA2vanesA2moveA2inA2theA2rotorA2-A2Ans--E

InA2aA2gasA2turbine,A2thereA2areA2fewerA2turbineA2stagesA2thanA2compressorA2stagesA2bec
ause:
SelectA2one:
A.A2EnergyA2canA2beA2extractedA2moreA2efficientlyA2inA2theA2turbine
B.A2TurbineA2bladesA2areA2biggerA2soA2requireA2fewer
C.A2HigherA2exhaustA2temperaturesA2canA2beA2tolerated
D.A2TheA2hotA2gasesA2occupyA2moreA2volume
E.A2HotA2exhaustA2gasesA2areA2requiredA2forA2theA2HRSG'sA2-A2Ans--A

PressureA2limitingA2devicesA2ofA2refrigerationA2systemsA2shallA2beA2connected:
SelectA2one:
A.A2BetweenA2theA2compressorA2andA2theA2stopA2valveA2onA2theA2suctionA2side
B.A2ToA2aA2blowdownA2tank
C.A2BetweenA2theA2inletA2ofA2theA2condenserA2andA2theA2outletA2ofA2theA2receiver
D.A2BetweenA2theA2compressorA2andA2theA2stopA2valveA2onA2theA2dischargeA2side
E.A2ToA2theA2receiverA2outletA2-A2Ans--D

TheA2warm-upA2timeA2requiredA2ofA2aA2turbineA2isA2dependantA2on:
SelectA2one:
A.A2HowA2quicklyA2theA2turbineA2isA2required
B.A2TheA2manufacturer'sA2instructions
C.A2TheA2sizeA2ofA2theA2turbine
D.A2TheA2typeA2ofA2turbine
E.A2WhetherA2theA2steamA2isA2dryA2orA2wetA2-A2Ans--C

_____A2compressorsA2requireA2intakeA2andA2dischargeA2valves.
SelectA2one:
A.A2Rotary
B.A2Centrifugal
C.A2SlidingA2vane
D.A2RotaryA2lobe
E.A2ReciprocatingA2-A2Ans--E

BesidesA2reducingA2NOx,A2waterA2injectionA2systems
SelectA2one:
a.A2stabilizeA2theA2combustionA2process,A2therebyA2increasingA2theA2lifeA2ofA2hotA2sectionA
2components
b.A2helpA2keepA2theA2compressorA2bladingA2clean
c.A2reduceA2theA2gasA2turbine'sA2thermalA2efficiency

, d.A2decreaseA2theA2powerA2outputA2-A2Ans--C

TheA2pressureA2atA2theA2outletA2fromA2theA2movingA2bladesA2isA2theA2sameA2asA2theA2pres
sureA2atA2theA2inletA2toA2theA2movingA2bladesA2inA2a/anA2__________A2turbine.
SelectA2one:
A.A2Topping
B.A2Reaction
C.A2BackA2pressure
D.A2Impulse
E.A2ExtractionA2-A2Ans--D

AA2condenserA2shellA2mayA2beA2fittedA2withA2anA2expansionA2jointA2ifA2the:
SelectA2one:
A.A2ExpectedA2temperatureA2differentialsA2willA2beA2greaterA2thanA220°C
B.A2CondenserA2tubesA2areA2U-shaped
C.A2CondenserA2isA2ofA2weldedA2construction
D.A2CondenserA2tubesA2areA2expandedA2intoA2theA2tubeA2sheets
E.A2TubeA2sheetsA2areA2madeA2ofA2AdmiraltyA2brassA2-A2Ans--D

AdjustableA2inletA2diffuserA2vanesA2onA2centrifugalA2airA2compressorsA2areA2implementedA
2to:
SelectA2one:
A.A2ChangeA2theA2operatingA2characteristicsA2ofA2theA2compressor
B.A2ChangeA2theA2directionA2ofA2theA2airA2flowA2toA2removeA2moisture
C.A2RemoveA2foreignA2particlesA2fromA2theA2air
D.A2OnlyA2reduceA2theA2amountA2ofA2airA2enteringA2theA2compressor
E.A2PreventA2backA2orA2reverseA2flowA2ofA2airA2-A2Ans--A

PositiveA2displacementA2compressorA2typesA2include:A2
1.A2SlidingA2vaneA2
2.A2AxialA2flowA2
3.A2InternalA2gearA2
4.A2VoluteA2casingA2
5.A2RotaryA2screwA2
6.A2MultiA2lobe
SelectA2one:
A.A21,A23,A24,A26
B.A22,A24,A25,A26
C.A21,A23,A25,A26
D.A21,A22,A24,A25
E.A22,A23,A24,A26A2-A2Ans--C

ReciprocatingA2CompressorA2valvesA2areA2usuallyA2automaticA2andA2openA2andA2closeA2b
y:
SelectA2one:
A.A2ActionA2ofA2aA2poppetA2valve