Jet Engine Mcq

7/26/2019 Jet Engine Mcq

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Question Number. 62. Supervisory E.E.C sends its output to the.Option A. fuel valve.

Option B. H..!"#.#.$.

Option C. E$% thermo&ouple &ir&uit.

Corre&t Ans'er is. H..!"#.#.$.E(planation. )B2**+,-, has this system + the trim sinal is passed to the #.#.$. a #A/EC enine

'ould re&eive trim sinals at the H..!.

Question Number. 6-. 0f a #A/EC loses its A/C input. 0n the short term it 'ill.

Option A. o to limit prote&tion mode.

Option B. o into hard reversion.

Option C. o into soft reversion.Corre&t Ans'er is. o into soft reversion.

E(planation. Sometimes 1no'n as the Alternate mode. C#+6 #A/EC enine has this fa&ility.

Question Number. 6. %he primary purpose of an E.E.C is.

Option A. to &hane analoue inputs into diital format to provide lass &o&1pit information and

redu&e fliht &re' 'or1load.

Option B. to save fuel3 redu&e &re' 'or1load and redu&e maintenan&e &osts.Option C. to &hane analoue inputs into diital format to redu&e fliht &re' 'or1load and

provide maintenan&e information.

Corre&t Ans'er is. to save fuel3 redu&e &re' 'or1load and redu&e maintenan&e &osts.

E(planation. 0nputs and outputs to the #A/EC are both diital and analoue3 hen&e a and b areboth 'ron. Optimised performan&e is the reason #A/EC 'as introdu&ed

Question Number. 6,. 4hen both #A/EC &hannels are healthy they 'ill alternate.

Option A. as sele&ted on the fliht de&1.Option B. 'hen one &hannel fails.

Option C. on ea&h enine start.

Corre&t Ans'er is. on ea&h enine start.E(planation. 5eppesen Air&raft o'erplant ae 7+28.

Question Number. 66. %he purpose of the 9 fuel pump is to.Option A. ensure the H. fuel pump does not &avitate.

Option B. pump fuel from the air&raft fuel tan1s to the enine.

Option C. ensure the fuel flo' overnor ets enouh fuel.

Corre&t Ans'er is. ensure the H. fuel pump does not &avitate.

E(planation. aintains about 8 psi to the inlet of the H. ump.

Question Number. 67. 0n a #A/EC system3 'hat is the result of Channel A failin to re&eiveinformation from a sensor:.

Option A. Channel A 'ill ta1e the information from the ba&1up sensor.

Option B. Channel A 'ill ta1e the information from &hannel B.

Option C. Channel B 'ill assume &ontrol.Corre&t Ans'er is. Channel A 'ill ta1e the information from &hannel B.

E(planation. %his assumes that &hannel A is still &apable of full &ontrol and that &hannel B is

re&eivin a ood sensor sinal.

Question Number. 6;. 0n a #A/EC enine 'ith a hydrome&hani&al fuel system3 ho' is fuel flo'


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&ontrolled:.Option A. By oil hydrauli&s.

Option B. By fuel pressure.

Option C. By ele&tro+hydrauli& servo valves .

Corre&t Ans'er is. By ele&tro+hydrauli& servo valves .E(planation. 5eppesen $as %urbine o'erplants ae 7+28 refers.?

Question Number. 6@. On the approa&h.Option A. ) should be above the minimum idle for ma(imum a&&eleration.

Option B. ) should be hih.

Option C. ) should be lo'er than minimum for ma(imum a&&eleration.

Corre&t Ans'er is. ) should be above the minimum idle for ma(imum a&&eleration.E(planation. A hih idle settin is used for ma(imum a&&eleration in the event of

overshoot.

Question Number. 78. %he air data inputs to the #A/EC E.C.! fails. %he result 'ill be.

Option A. a la&1 of fliht data.

Option B. the E.C.! reverts to the fail+safe mode.

Option C. un&orre&ted data from hard 'ired analoue sensors is utilised.Corre&t Ans'er is. the E.C.! reverts to the fail+safe mode.

E(planation. 0f all air data input fails then the E.C.! reverts to an alternate mode.

Question Number. 7*. A #A/EC system &onsists of.

Option A. H..!3 A./.C and sensors.

Option B. E.E.C3 A./.C and sensors.

Option C. H..!3 sensors and an E.E.C.

Corre&t Ans'er is. H..!3 sensors and an E.E.C.E(planation. 5eppesen Air&raft $as %urbines ae 7+62 refers.

Question Number. 72. A fuel heater prevents.

Option A. entrained 'ater in fuel freein.

Option B. 9 fuel filter i&in.

Option C. pipelines freein.Corre&t Ans'er is. entrained 'ater in fuel freein.

E(planation. 5eppesen Air&raft $as %urbine o'erplant ae 7+, refers. 4hilst the 9 fuel filter

may blo&1 as a result of freein it is the entrained 'ater that froe first.

Question Number. 7-. 4hen re+liht is reuired in fliht on a #A/EC enine3 the pilot

sele&ts.

Option A. one initer.Option B. initer sele&ted automati&ally.

Option C. both initers.

Corre&t Ans'er is. initer sele&ted automati&ally.

E(planation. %he #A/EC &hooses 'hi&hever initer it 'ants.

Question Number. 7. %he position of fuel heater in fuel system is.

Option A. bet'een the fuel &ontrol unit and the burner manifold.

Option B. after the 9 fuel filter and before the H. pump.Option C. before the 9 fuel filter.


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Corre&t Ans'er is. before the 9 fuel filter.E(planation. %his position ensures the fuel 'ill not freee in the fuel filter. )) %he 5et Enine

ae **6 ara *88 refers.

Question Number. 7,. %he E.E.C re&eives its primary po'er from.

Option A. **,= AC emeren&y B!S.Option B. separate permanent manet alternator.

Option C. **,= AC main B!S.Corre&t Ans'er is. separate permanent manet alternator.

E(planation. 5eppesen Air&raft $as %urbine o'erplant pae 7+22 refers. note that ans'ers a and

b are ba&1 up po'er supplies.

Question Number. 76. %he fuel trimmer on a turbo+prop enine isoperated.

Option A. manually3 to prevent hih E$% due to altitude in&rease.

Option B. automati&ally &ontrolled in &onDun&tion 'ith #C!.Option C. manually to prevent e(&essive ) at hih altitude.

Corre&t Ans'er is. automati&ally &ontrolled in &onDun&tion 'ith #C!.

E(planation. No %urbo+prop air&raft has a manual fuel trimmer as far as 'e are a'are. 5eppesen

ae 7+*2 sub para d further refers.

Question Number. 77. %he main advantae of #A/EC is.

Option A. it has ele&tri&al &ontrol of hydro me&hani&al unit in all modes.Option B. effi&ien&y is al'ays ma(imum.

Option C. it &hanes %.9.A to most effi&ient E..) ratin.

Corre&t Ans'er is. effi&ien&y is al'ays ma(imum.

E(planation. )edu&ed pilot 'or1load and ma(imum effi&ien&y of performan&e is the reatest

advantae of #.A./.E.C.

Question Number. 7;. 0nlet side of a fuel pump has a.Option A. threaded mi&ron filter.

Option B. 'ire mesh filter.

Option C. 'ire 'ound filter.

Corre&t Ans'er is. 'ire mesh filter.E(planation. 5eppesen air&raft as turbine o'erplants ae 7+; refers.

Question Number. 7@. 4hen a throttle is sele&ted to in&rease po'er3 the pressure drop a&ross

the #uel Control !nit throttle orifi&e.Option A. in&reases then de&reases due to de&reasin pump output.

Option B. drops then in&reases due to in&reasin pump output.

Option C. remains the same.Corre&t Ans'er is. drops then in&reases due to in&reasin pump output.

E(planation. On sele&tion the pressure drop a&ross the throttle de&reases then re&overs as the

pump in&reases the flo' of fuel.

Question Number. ;8. 4hen the E.E.C supervisory &ir&uit senses a fault on the enine3 the fault

annun&iator

liht 'ill be on and the E.E.C 'ill.

Option A. remove fuel3 do'n trimmin sinal only 'hen E.E.C s'it&h sele&ted off.Option B. remove fuel3 do'n trimmin sinal immediately.


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Option C. remove fuel3 do'n trimmin sinal only after landin.Corre&t Ans'er is. remove fuel3 do'n trimmin sinal immediately.

E(planation. %he E.E.C referred to here is that dis&ussed in )olls )oy&e the 5et Enine pae **2.

0t is fitted to an )B2**+,-,E.

Question Number. ;*. 0n+#liht the enine E.E.C &ontrols.Option A. E$%.

Option B. throttle position.Option C. fuel flo'.

Corre&t Ans'er is. fuel flo'.

E(planation. %hrottle position is &ontrolled by the &re' or auto throttle. E$% is a fun&tion of fuel

flo'.

Question Number. ;2. A #A/EC does not have 'hi&h of the follo'in:.

Option A. Control of thrust reverser operation.Option B. An automati& startin &apability.

Option C. Automati& &ontrol of enine fire bottles.

Corre&t Ans'er is. Automati& &ontrol of enine fire bottles.

E(planation. #ire e(tinuishers are al'ays operated from the fliht de&1.

Question Number. ;-. A #A/EC &onsists of.

Option A. Ele&troni& &ontrols3 sensors and an H..!.Option B. Ele&troni& &ontrol and throttle position transmitter.

Option C. Ele&troni& &ontrol only.

Corre&t Ans'er is. Ele&troni& &ontrols3 sensors and an H..!.

E(planation. A #A/EC is the full system of sensors and &ontrol unit. Sometimes the Hydro

me&hani&al !nit is also in&luded as part of the system.

Question Number. ;@. 4hen #A/EC is in normal mode.

Option A. &hannel A or B 'ill be in &ommand.

Option B. &hannel A 'ill be in &ommand.Option C. &hannel B 'ill be in &ommand.

Corre&t Ans'er is. &hannel A or B 'ill be in &ommand.

E(planation. Both &hannels are operatin but either one &an be in &ontrol if they are both

healthy.

Question Number. @8. Out of the follo'in thrust lever resolver anles3 'hi&h one is thefor'ard idle settin:.Option A. , derees.

Option B. ;, derees.

Option C. 8 derees.

Corre&t Ans'er is. 8 derees.E(planation. All #A/EC enines 'ill have reverse thrust settins therefore the %.9.A of 8 derees

'ill be ma( reverse3 and ;, 'ill be ma( for'ard therefore 8 is the idle fiureure.

Question Number. @2. #uel boost pumps are &ooled usin.

Option A. ram air.

Option B. #uel pumps do not reuire &oolin.Option C. fuel.


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Corre&t Ans'er is. fuel.E(planation. #uel pumps3 of any type usually use the fuel they are pumpin to &ool the bearins.

Question Number. @. Baffles in a riid fuel tan1.

Option A. help prevent mi&ro+bioloi&al &orrosion.Option B. strenthen the tan1 stru&ture.Option C. prevent sure.

Corre&t Ans'er is. prevent sure.

E(planation. %his uestion 'as definitely as1ed in module *,+ it should be in module **.

Question Number. @,. 0n a #A/EC system3 'hat does the E.E.C measure alon 'ith ) :.

Option A. ressure and %emperature.

Option B. ressure.Option C. %emperature.

Corre&t Ans'er is. ressure and %emperature.

E(planation. Normally the E.E.C reads as a minimum %o o s- and %2,.

Question Number. @6. 0n a #A/EC system3 ho' are the po'er supply 'indins for &hannel A and

Channel B 'ound:.

Option A. %'o independent enerators.Option B. On one enerator 'ith 2 separate 'indins.

Option C. One enerator and one 'indin.

Corre&t Ans'er is. On one enerator 'ith 2 separate 'indins.

E(planation. %he enine alternator is a permanent manet alternator 'ith 2 'indins 'ithin thestator housin. %here may also be a third 'indin that is used to indi&ate H. ) 'ithin the same housin.

Question Number. @7. 0f an Enine #A/EC system loses air+data permanently3 the pilot 'ill.

Option A. turn that E.E.C Off.

Option B. sele&t alternate pitot stati&.

Option C. s'it&h to Alt on the relevant E.E.C.Corre&t Ans'er is. s'it&h to Alt on the relevant E.E.C.

E(planation. By s'it&hin to Alternate mode manually the E.E.C uses &ornerstone amb and

%amb.

Question Number. @;. A #A/EC system ta1es measurements from Enine Speed3.

Option A. %emperature and ressure.Option B. and %emperature.Option C. and ressure.

Corre&t Ans'er is. %emperature and ressure.

E(planation. %+ambient3 +ambient and s- as a minimum.

Question Number. @@. ain purpose of the fuel boost pumps is to provide.

Option A. emeren&y dump Dettison.

Option B. &ross+feed fuel from one tan1 to another.Option C. fuel pressure to both enine pumps.

Corre&t Ans'er is. fuel pressure to both enine pumps.

E(planation. Supply of fuel to the enines is the primary purpose althouh the other t'o ans'ersmay also be options.


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Question Number. *82. E.E.C re&eives sinals from ) sensor and.Option A. pressure sensors.

Option B. pressure and temperature sensors.

Option C. temperature sensors.

Corre&t Ans'er is. pressure and temperature sensors.E(planation. odern #A/EC systems re&eive all three types of sensor but uite often do not use

the E$% sinals for &ontrol.

Question Number. *8-. 4hen does E.E.C &hannel &hane over o&&ur:.

Option A. On enine start up.

Option B. On enine shut do'n.

Option C. On fault.Corre&t Ans'er is. On enine start up.

E(planation. %he E.E.C prepares for the &haneover by resettin the E.E.C on shut do'n3 but

does not a&tually do it until the ne(t start. A simple sinle fault 'ill not &ause a &hane over.

uestion Number. 2;. %hrust ratin on an #A/EC &ontrolled enine &an be &haned by.Option A. varyin the ballast resistor in the E$% system.Option B. &hanin the enine ratin plu.

Option C. varyin the E) datum plu.

Corre&t Ans'er is. &hanin the enine ratin plu.

E(planation. 5eppesen Air&raft o'erplant ae 7+2* refers.

Question Number. *;. On a #A/EC enine.

Option A. A &hannel uses &ontrol alternator and B &hannel uses air&raft bus po'er.

Option B. A &hannel uses a separate 'indin of the &ontrol alternator to B &hannel.Option C. A and B &hannel use the same phases of the motor.

Corre&t Ans'er is. A &hannel uses a separate 'indin of the &ontrol alternator to B &hannel.

E(planation. 5epperson $as %urbine o'erplant ae 7+22 refers.

Question Number. 26. On a #A/EC enine the E.E.C.

Option A. has ele&troni& &ontrol of the hydro+me&hani&al fuel &ontrol in some modes.

Option B. has me&hani&al &ontrol of the hydro+me&hani&al fuel &ontrol system.Option C. has ele&troni& &ontrol of the hydro+me&hani&al fuel &ontrol unit in all modes.

Corre&t Ans'er is. has ele&troni& &ontrol of the hydro+me&hani&al fuel &ontrol unit in all modes.

E(planation. 5epperson $as %urbine o'erplants ae 7+28 refers.

Question Number. 2;. On a #A/EC enine3 the &hannel reset.

Option A. al'ays sele&ts A &hannel.

Option B. sele&ts B &hannel.

Option C. sele&ts standby 'hi&h be&omes a&tive on the ne(t start.

Corre&t Ans'er is. sele&ts standby 'hi&h be&omes a&tive on the ne(t start.E(planation. C#6+;8 C2 #A/EC Enine Course notes refer.

Question Number. 2. 4hy is it ne&essary to &ontrol fuel supply to the enine durin rapid

a&&eleration:.Option A. %o prevent &ompressor stall above &ruise ) .

Option B. %o &ontrol ma(imum ) .

Option C. %o prevent e(&essively hih E$% and possible &ompressor sure.

Corre&t Ans'er is. %o prevent e(&essively hih E$% and possible &ompressor sure.E(planation. )olls )oy&e %he 5et Enine ae *8 refers.

Question Number. -. 4hi&h &omponent &orre&ts for air density effe&ts on fuel"air mi(ture in a


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as turbine enine:.Option A. %he barometri& pressure &ontrol unit.

Option B. %he adDustable throttle valve.

Option C. %he pressurisin valve.

Corre&t Ans'er is. %he barometri& pressure &ontrol unit.E(planation. Barometri& pressure senses density &hanes.

Question Number. . 4hy is the hih pressure fuel pump fitted in a as turbine enineair&raft:.

Option A. %o maintain a vapour free pressure from the air&raft fuel tan1s to the 9 fuel pump.

Option B. As an emeren&y in &ase of failure of the 9 pump.

Option C. %o provide the maDority of the fuel pressure to the enine.Corre&t Ans'er is. %o provide the maDority of the fuel pressure to the enine.

E(planation. )olls )oy&e %he 5et Enine ae **2 refers.

Question Number. ,. 4hat are the positions of the pressuriation valve and the dump valve in

a Det enine fuel system 'hen the enine is shut do'n:.

Option A. ressuriation valve open3 dump valve open.

Option B. ressuriation valve &losed3 dump valve open.Option C. ressuriation valve &losed3 dump valve &losed.

Corre&t Ans'er is. ressuriation valve open3 dump valve open.

E(planation. N09.

Question Number. 6. %he density of air is very important 'hen mi(in fuel and air to obtain a

&orre&t fuel to air ratio. 4hi&h of the follo'in 'eihs the most:.

Option A. 7, parts of dry air and 2, parts of 'ater vapor.

Option B. *88 parts of dry air.Option C. ,8 parts of dry air and ,8 parts of 'ater vapor.

Corre&t Ans'er is. *88 parts of dry air.

E(planation. N09.

Question Number. 7. A mi(ture ratio of *** normally refers to.

Option A. * part air to ** parts fuel.Option B. a stoi&hiometri& mi(ture.

Option C. * part fuel to ** parts air.

Corre&t Ans'er is. * part fuel to ** parts air.

E(planation. N09.

Question Number. ;. #or 'hat primary purpose is a turbine enine fuel &ontrol unit

trimmed:.Option A. %o obtain ma(imum thrust output 'hen desired.

Option B. %o properly position the po'er levers.

Option C. %o adDust the idle ) .

Corre&t Ans'er is. %o obtain ma(imum thrust output 'hen desired.E(planation. 5eppesen AF %e&hni&ian ropulsion %e(tboo1 7+6@.

Question Number. @. 4hi&h type of fuel &ontrol is used on most of todayGs turbine

enines:.Option A. Hydrome&hani&al or ele&troni&.


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Option B. e&hani&al.Option C. Ele&troni&.

Corre&t Ans'er is. Hydrome&hani&al or ele&troni&.

E(planation. 5eppesen AF %e&hni&ian ropulsion %e(tboo1 7+68.

Question Number. ,8. !nder 'hi&h of the follo'in &onditions 'ill the trimmin of a turbineenine be most a&&urate:.

Option A. No 'ind and lo' moisture.Option B. Hih moisture and lo' 'ind.

Option C. Hih 'ind and hih moisture.

Corre&t Ans'er is. No 'ind and lo' moisture.

E(planation. N09.

Question Number. ,*. An H..! re&eives its sinals from.

Option A. E.E.C.Option B. A/C.

Option C. thrust lever resolvers.

Corre&t Ans'er is. E.E.C.

E(planation. 5eppesen Air&raft o'erplant ae 7+28.

Question Number. ,. A supervisory ele&troni& enine &ontrol is a system that re&eives

enine operatin information and.Option A. &ontrols enine operation a&&ordin to ambient temperature3 pressure3 and humidity.

Option B. adDusts a standard hydrome&hani&al fuel &ontrol unit to obtain the most effe&tive

enine operation.

Option C. develops the &ommands to various a&tuators to &ontrol enine parameters.Corre&t Ans'er is. adDusts a standard hydrome&hani&al fuel &ontrol unit to obtain the most

effe&tive enine operation.


Question Number. ,,. 0n a #A/EC system3 a&tive &ontrol s'it&hover o&&urs.

Option A. 'hen &hannels A and B are healthy.

Option B. on shutdo'n.Option C. on enine start up only.

Corre&t Ans'er is. on enine start up only.

E(planation. 5eppesen Air&raft o'erplant ae 7+28.

Question Number. ,6. 4hat &auses the fuel divider valve to open in a turbine enine duple(

fuel nole:.Option A. An ele&tri&ally operated solenoid.Option B. Bleed air after the enine rea&hes idle ) .

Option C. #uel pressure.

Corre&t Ans'er is. #uel pressure.


Question Number. ,7. %he valve on a vane type fuel flo' measurin devi&e be&omes stu&1.

4hat safety ba&1up is available for the enine fuel flo':.Option A. A differential pressure bypass valve.

Option B. A bypass valve.

Option C. A fuel bleed valve.

Corre&t Ans'er is. A differential pressure bypass valve.


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E(planation. allett Air&raft 0nstruments and interated systems pae -6@ refers. Note the valveopens aainst sprin pressure.

Question Number. ,;. 4hat are the prin&ipal advantaes of the duple( fuel nole used in manyturbine enines:

Option A. Allo's a 'ider rane of fuels and filters to be used.Option B. )estri&ts the amount of fuel flo' to a level 'here more effi&ient and &omplete burnin

of the fuel is a&hieved.Option C. rovides better atomiation and uniform flo' pattern.

Corre&t Ans'er is. rovides better atomiation and uniform flo' pattern.


Question Number. ,@. 4hat is the purpose of the flo' divider in a turbine enine duple( fuel

nole:.

Option A. Allo's an alternate flo' of fuel if the primary flo' &los or is restri&ted.Option B. rovides a flo' path for bleed air 'hi&h aids in the atomiation of fuel.

Option C. Creates the primary and se&ondary fuel supplies.

Corre&t Ans'er is. Creates the primary and se&ondary fuel supplies.


Question Number. 68. 4hi&h of the follo'in turbine fuel filters has the reatest filterin

a&tion:.Option A. Sta&1ed &har&oal.

Option B. Small 'ire mesh.

Option C. i&ron.

Corre&t Ans'er is. i&ron.

E(planation. N09.

Question Number. 6*. 4here is the enine fuel shutoff valve usually lo&ated:.Option A. Aft of the fire'all.

Option B. AdDa&ent to the fuel pump.

Option C. /o'nstream of the enine driven fuel pump.

Corre&t Ans'er is. /o'nstream of the enine driven fuel pump.E(planation. 5eppesen AF %e&hni&ian ropulsion %e(tboo1 7+6-.

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