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(M15)

1(0023834)

C

Howdoesadualaxial-flowcompressorimprovetheefficiencyofaturbojetengine AByusingmoreturbinestagesBBydecreasing

combustionchambertemperaturesCByhighercompressionratiosA

B C

2(0035846)

A

Ifanaircraftclimbswithafixedthrottleposition A

thrustdecreasesandRPMincreases.BthrustandRPMremainthesame.CthrustincreasesandRPMremainsthesame.

, A B

C

3(0046402)

B

Ifanelectricalde-icingsystemisoperating,thrustwill....

Adecrease.Bremainconstant.Cincrease.

(electricde-icing) , A

B C

4(0023814)

C

Inaturbineenginewithadual-spoolcompressor,thelow-speedcompressor...Aalwaysturnsatthesamespeedasthehigh-speedcompressor.Bisconnecteddirectlytothehigh-speedcompressor.

Cseeksitsownbestoperatingspeed.

A

B C

5(0023900)

C

Whichofthefollowingtypesofcombustionsectionsareusedinaircraftturbineengines?AAnnular,variable,andcascadevane.BCan,multiple-can,andvariable.CMultiple-can,annular,andcan-annular.

A(Cascade) B C

6(0055717)

C

Theheatabsorbedbyengineinternalcomponentscanbedetrimentaltothrustandispreventedby

(A)reducingfuelflowtoreduceinternaltemperature.(B)bleedingairoffthecompressortoheatthecomponents.(C)bleedingairoffthecompressortocoolthecomponents.

, ,

(A) (B)

(C)

7(0055765)

A

Wheredoesthehighvoltagetypeturbineignitionreceiveits

voltagepulsefrom?

(A)Primarywindings.(B)Rectifier.(C)Triggertransformer.

(A) (B) (C)

8(0023819)

B

Duringstartingofaturbineengine,ahungstartisindicatedif(A)exhaust-gastemperatureexceedsspecifiedlimits.(B)theenginefailstoreachidlerpm.(C)enginerpmexceedsspecifiedoperatingspeed.

(hungstart)

(A) (B) (C)

9(0055766)

C

OnagasturbineengineDCstartingcircuit,ifthereisanopencircuitonthecontactoftheoverspeedrelay,

(A)thestartermotorwillstoponlywhenstarterswitchselectedoff.(B)thestartermotorwillcontinuetorunfor30secandthenstop.(C)nopowersupplyisconnectedtothestartermotor.

,?

(A) "" , (B)

30, (C)

10(0055816)

B

Athermocoupleindicatorisbasicallya

(A)milliammeter.(B)millivoltmeter.(C)milliohmeter.

(A) (B) (C)

11(0055779)

A

WhentestinganE.G.T(ExhaustGasTemperature)system,

(A)theO.A.Tisalwaystakenintoconsideration.(B)theO.A.Tisneglected.(C)O.A.Tisonlytakenintoconsiderationwhenover20°C.

,

(A) (B) (C)

20C,

12(0023962)

A

Iftheengineisrunforaperformance-recoverycompressorwashing,itisoperatedat RPM.

(A)Idle(B)Cruise(C)Takeoff

(A) (B) (C)

13(0055858)

C

Afreeturbineisusuallyfoundona

(A)turbo-jet.(B)turbo-fan.(C)turboprop.(freeturbine)

(A) (B) (C)

14(0055861)

A

Torquemeasurementistakenfromthe

(A)reductiongearbox.(B)propshaft.(C)freeturbineshaft.

(A) (B) (C)

15(0023818)

C

Aturboproppowerplantpropeller

(A)isgovernedatthesamespeedasthatoftheturbine.(B)controlsthespeedoftheengineinthebetarange.(C)accountsfor75to85%ofthetotalthrustoutput.

(A) (B) (C)

7585

16(0055712)

B

Inanaxialflowturbineengine,compressorbleedairissometimesusedtoaidincoolingthe

(A)compressorinletguidevanes.(B)statorvanes,rotorblades,andbearingsinturbinesection.(C)fuel.

,

(A) (B) (C)

17(0023950)

A

Airusedtocooltheturbinebladesistakenfromthe

(A)highpressurecompressor.(B)lowpressurecompressor.(C)turbofan.

(A) (B) (C)

18(0055720)

B

Airbleedforananti-icesystemis

(A)tappeddirectlyoffthecompressor.(B)sentthroughapressureregulator.(C)sentthroughtheairconditioning.

(A) (B) (C)

19(0055750)

B

Inspectionofpneumaticstartersbymaintenancetechniciansusuallyincludescheckingthe

(A)statorandrotorbladesforFOD.(B)oillevelandmagneticdrainplugcondition.(C)rotoralignment.

,

(A) , (B)

(C)

20(0023918)

A

Duringstartingofaturbineengine,

(A)ahotstartisindicatediftheexhaust-gastemperatureexceedsspecifiedlimits.(B)anexcessivelyleanmixtureislikelytocauseahotstart.(C)theengineignitionshouldstartfrom60sto80safterthefuelshutoffvalveisopened.

?

(A) (hotstart) (B)

(C) 60

80

21(0055741)

A

Highenergyignitionisrequiredbecauseofthe

(A)highflashpointofthefuel.(B)absorbedmoisturecontent.

(C)lowflashpointofthefuel.

,

(A) (B) (C)

22(0023819)

B

Duringstartingofaturbineengine,ahungstartisindicatedif(A)exhaust-gastemperatureexceedsspecifiedlimits.(B)theenginefailstoreachidlerpm.(C)enginerpmexceedsspecifiedoperatingspeed.

(hungstart)

(A) (B) (C)

23(0055800)

B

Enginepressureratioisthetotalpressureratiobetweenthe(A)frontoftheengineinletandtheaftendofthecompressor.

(B)frontofthecompressorandtherearoftheturbine.(C)aftendofthecompressorandtheaftendoftheturbine.

(A) (B) (C)

24(0055781)

A

Whathappenswhenbulbtypethermometerresistiveelementgoesopencircuit?

(A)Readslessthanambient.(B)Noreadinggiven.(C)Readsmorethanambient.

(),

(A) (B) (C)

25(0055780)

B

WhatistheEnginePressureRatio(E.P.R.)usedfor?

(A)Tolimitthemaximumexhaustgastemperature.(B)Toindicatethethrustproducedbytheengine.(C)Asacrosscheckforminimumacceptablethrust.

(A) (B) (C)

26(0055806)

A

Motordrivenimpellerandturbinefuelflowtransmittersaredesignedtotransmitdata

(A)byusingaircraftelectricalsystempower.(B)mechanically.

(C)byfuelpressure.

?

(A) (B) (C)

27(0023911)

C

Whatisthefunctionofgasgeneratororgasproducerofafree-turbineturbopropengine?

(A)produceelectricity.(B)producethrust.(C)producehigh-velocitygaseswhichdrivethepowerturbine.

(gasgeneratororgasproducer)

(A) (B) (C)

28(0055878)

A

FuelschedulingduringA.P.U(AuxiliaryPowerUnit)startandundervaryingpneumaticbleedandelectricalloadsismaintained

(A)automaticallybytheA.P.Ufuelcontrolsystem.(B)manuallythroughpowercontrolleverposition.(C)semiautomaticthroughpowercontrolleverposition.

(APU) ,

(A) (B) ,

(C) ,

29(0055872)

B

AnA.P.U(AuxiliaryPowerUnit)shutdownisinitiatedby

(A)highoilpressure,firewarning,hotoiltemperature.(B)lowoilpressure,firewarning,hotoiltemperature.(C)lowoilpressure,firewarning.

, (APU)?

(A) , , (B) , ,

(C) ,

30(0055873)

C

AnA.P.U(AuxiliaryPowerUnit)startcycleiscompletedat(A)100%RPM.(B)75%RPM.(C)95%RPM.

(APU)

(A) 100%(B) 75%(C) 95%

31(0055747)

B

Asafetyfeatureusuallyemployedinpneumaticstartersthatisusediftheclutchdoesnotreleasefromtheenginedriveatthepropertimeduringstartisthe

(A)springcouplingrelease.(B)driveshaftshearpoint.(C)flyweightcutoutswitch.

, ,

(A) (B) (C) (flyweight)

32(0055818)

C

Thrustinahighbypassfanengineisindicatedby

(A)N3RPMorP1/P4ratio.(B)N1RPMorN3RPM.(C)N1RPMorE.P.R.(EnginePressureRatio)

?

(A)N3 P1/P4 (B)N1 N3 (C)N1

(E.P.R)

33(0023856)

C

Whatistheinstrumentthatindicatesthethrustofagas-turbineengine?

(A)Torquemeter(B)Exhaust-gastemperatureindicator(D)Enginepressureratioindicator

?

(A) (B) (D)

34(0055826)

B

Vibrationpick-upsarelocated

(A)onbothfanandturbinecases.(B)onthefan/compressorcase.

(C)ontheturbinecase.

(A) (B) (C)

35(0055860)

A

Thefuelflowinaturbopropenginewithintheconstantspeedrangeiscontrolled

(A)automatically.(B)manually.(C)NoControl.

,

(A) (B) (C)

36(0060601)

B

Whichstatementregardingtheenginepoweroutputforaturboshaft-enginedrivenhelicopteriscorrect?

(A)Poweroutputisdirectlyconnectedtobothrotorandtailrotor.(B)Poweroutputistransferredtomaingearboxandthereaftertodriverotorandtailrotorafterspeedreduction.(C)Poweroutputistransferredtomaingearboxandbutonlydrivesrotorafterspeedreduction.Partialpowerwillbeallocatedtodrivetailrotorspeeddirectly.

(turboshaft)

(A) (B) (main

gearbox) (C) (main

gearbox)

37(0055868)

C

Thebasicgasturbineengineisdividedintotwomainsections:thecoldsectionandthehotsection.

(A)Thecoldsectionincludestheengineinlet,compressor,andturbinesections.(B)Thehotsectionincludesthecompressor,diffuser,andexhaust.(C)Thehotsectionincludesthecombustor,turbine,andexhaust.

Basicgasturbineengine?

(A) (B)

(C)

38(0060600)

C

Whichstatementregardingtherotor-speedcontrolofaturboshaft-enginedrivenhelicopteriscorrrect?

(A)Engineoutputshouldberaisedaspossible,astoincreaserotorspeedandflightspeed.(B)Engineoutputshouldbedecreasedaspossible,astoslowdownrotorspeedandhencesavefuelconsuming.(C)Enginefuelsupplyshouldbeadjusted,astokeepconstantrotorspeed.

(turboshaft) (RPM)

(A) (B)

(C)

39(0060599)

D

Themainpurposeofintroducingfree-wheelsysteminthetransmissionsystemofaturboshaft-enginedrivenhelicopteristo:

(A)toimprovecombustionefficiency.(B)enhanceoutputpoweraspossible.(D)enabledisconnectionofengine(s)andhenceforththeautorotationofhelicopterrotorsincaseofengine(s)failure.

(turboshaft)

(freewheel)

(A) (B) (D)

(Autorotation)

40(0055892)

C

WhatarethetwomostimportantsignalswhenmonitoringanA.P.U(AuxiliaryPowerUnit)?

(A)E.G.T(ExhaustGasTemperature)andRPM.(B)OilPressureandInletPressure.(C)E.G.TandOilPressure.

(APU)

(A) (B) (C)

41(0023826)

C

Whichofthefollowingisnotafactorintheoperationofanautomaticfuelcontrolunitonaturbojetengine?

(A)Compressorinlet-airdensity(B)Compressorrpm(C)Mixturecontrolposition

(A) (B) (C)

42(0055865)

C

Whatisthemainpurposeo