Module_14

Module 14 – Propulsion Sample Questions

Module 14 Propulsion 1. From where is manifold pressure taken on a supercharged engine? a) Between the carburetor and the supercharger b) Between the supercharger and the throttle # c) Between the carburetor and the induction ports 2. on a gas turbine engine, what is the fan driven b? a) !" turbine # b) " turbine c) $" turbine %. &hat is an engine stage? # a) 'ne rotor plus one stator b) 'ne $( and one rotor c) 'ne compressor rotor and one no**le guide vane +. he air data input to the F-/0 F-/0 fails. he result will be a) a lack of flight data b) uncorrected data from hard wired analogue sensors is utili*ed # c) the F-/0 reverts to the failsafe mode . orue measurement is taken from the a) free turbine shaft # b) reduction gearbo3 c) prop shaft 4. - F-/0 sstem consists of # a) !56, sensors and an //0 b) !56, -0 and sensors c) //0, -0 and sensors 7. &hat power suppl is reuired for a thermocouple sstem to work? a) irect current b) -lternating current # c) 8either of the above 9. $n a 2+ thermocouple sstem, sstem, one thermocouple goes goes open circuit. &hat error is detected at the indicator? # a) 8one b) 8o indication c) (auge free*es at last known reading :. in a thermocouple temperature sensing sstem, what is the purpose of the compensating resistor? a) o o standardi*e the reading for different engine tpes Page 1


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b) o correct for varing ambient temperatures at the cold ;unction c) o correct for varing ambient temperatures at the hot ;unction

1<. $n a dive, with the throttles fi3ed, the /"= will a) increase b) decrease # c) not change 11. !ow is the 81 and 82 measured on a triple spool engine? # a) "ulse tpe speed probes b) achometer connected to the e3ternal gearbo3 c) achometer connected to the internal gearbo3 12. - twin spool engine has a) one turbine on one shaft b) two turbines on one shaft # c) two turbines on two shafts 1%. - free turbine aircraft engine is most likel to be used on a a) high bpass engine b) a direct coupled engine # c) a helicopter engine +. "ropeller speed is measured from # a) a slip ring pulse probe b) a tachometer on the " turbine shaft c) a pulse probe at the engine side of the reduction gear 1. "ropeller torue is analogous to a) engine ="5 # b) shaft horsepower c) propeller ="5 14. !ow is power indicated on a fi3ed pitch propeller? # a) ="5 gauge b) orue gauge c) !orsepower gauge 17. &hat are the units of manifold pressure on a normall aspirated engine? a) ">$ b) $nches of water # c) $nches of mercur 19. $n a F-/0 what is the result of 0hannel - failing to receive information from a sensor? a) 0hannel B will assume control # b) 0hannel - will take the information from channel B c) 0hannel - will take the information from the backup sensor 1:. - snchro pressure measuring sstem reuires

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a) alternating current b) direct current c) either ac or dc

2<. - snchro pressure measuring sstem works on the principle of changes in pressure related to changes in a) freuenc b) voltage # c) flu3 21. "ure ;et engines use # a) stagnation thermocouples b) rapid response c) variable resistance thermocouples 22. 5odern oil pressure servo transmitters sense # a) differential pressure b) absolute pressure c) !" oil pressure 2%. /( thermocouples are usuall made of a) nickel and platinum b) chromel and platinum # c) chromel and alumel 2+. hrust is generated in a turboprop sstem b a) moving a small mass of air uickl b) moving a large mass of air uickl # c) moving a large mass of air slowl 2. "ower is ad;usted in a variable pitch turboprop aircraft b a) increasing ="5 # b) increasing fuel flow c) increasing pitch 24. hrust in a high bpass engine is measured b measuring a) 8% ="5 b) fuel flow # c) neither of the above, thrust is not indicated in flight 27. /"= is a ratio of a) "1 to "+ b) "1 to "fan # c) "1 to "4 29. he ma;orit of power in a free turbine engine is used to a) drive the gas generator # b) drive the free turbine c) e3pel gases through the e3haust

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2:. he total power in a turboprop engine is the a) >!" # b) />!" c) B!" %<. o measure oil temperature, which of the following would most likel be used? # a) =esistance temperature measurement b) hermocouple measurement c) 'ptical prometer %1. >train gauges ma be used to measure a) thrust # b) torue c) pressure %2. "ie*o electric transducers convert a) a tensile stress into a current output b) a pressure input into a resistance output # c) a force input into a voltage output %%. - broadband vibration reading indicates a) the 81 vibration # b) the average vibration c) the peak allowable vibration %+. ibration analsers determine which component is vibrating b analsing # a) freuenc b) amplitude c) voltage %. -n annular combustion chamber consists of a) an air tube and a flame tube # b) an outer skin and an inner and outer flame skin c) a series of flame tube in an air annulus %4. &hat percentage of air passing through the combustion section is burned? # a) +< b) < c) 7 %7. - full flow oil sstem has a) a single fi3ed minimum oil pressure b) a hot and cold oil pressure limit # c) a variable oil pressure dependant upon throttle setting %9. 'il uantit is transmitted to the /$0-> b a) a float switch in the oil tank # b) a reed switch ladder activated b magnetic float in the oil tank

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c) a belt tpe capacitor sstem %:. hrust in a high bpass fan engine is indicated b # a) 81 ="5 or /"= b) 8% ="5 or "1@"+ ratio c) 81 ="5 or 8% ="5 +<. he purpose of the " fuel pump is to a) ensure the fuel flow governor gets enough fuel b) pump fuel from the aircraft fuel tanks to the engine # c) ensure the !" fuel pump does not cavitate +1. he principle of operation of a 0 ratio meter is a) one coil moving in a uniform magnetic field b) two coils moving in a uniform magnetic field # c) two coils moving in a nonAuniform magnetic field +2. - thermocouple indicator is basicall a # a) millivoltmeter b) milliohmeter c) milliameter +%. $f a F-/0 loses its -0 input, in the short term it will # a) go into soft redundanc b) go into hard redundanc c) go to limit protection mode ++. &ith an aircraft with a fi3ed pitch propeller, what indication has the pilot got of the output power? a) fuel flow b) oil pressure # c) engine speed indicator +. he primar purpose of an //0 is a) to change analogue inputs into digital format to provide glass cockpit information and reduce flight crew workload b) to change analogue inputs into digital format to reduce flight crew workload and provide maintenance information # c) to save fuel, reduce crew workload and reduce maintenance costs +4. $f a tachogenerator indicated in reverse, the probable cause is a) wrong input freuenc # b) two phases cross connected c) suppl and transmitter cross connected +7. - sensing element goes open circuit in a ratiometer. &hat will be happen? a) emperature indicates below ambient # b) Full scale deflection c) !airspring takes indicator off scale

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+9. - thermocouple is constructed of # a) two dissimilar metals welded together b) two dissimilar metals with an air gap between them c) three dissimilar metals welded together +:. - thermocouple indication is taken from the a) hot ;unction # b) cold ;unction c) difference between the hot ;unction and the cold ;unction <. 'n a twin spool engine, the !" compressor is driven b a) ram air over the compressor # b) earl stages of the turbine c) later stages of the turbine 1. $n a multiple probe thermocouple sstem, what is the effect if one probe fails? # a) 8o noticeable effect b) =eduction in temp reading c) $ncrease in temp reading 2. $n a gas turbine if air is tapped from the !." bleed # a) /"= decreases and /( increases b) /"= stas constant and /( decreases c) /"= increases and /( decreases %. he vane on a vane tpe fuel flow measuring device becomes stuck. &hat safet backup is available for the engine fuel flow? a) - fuel bleed valve b) - bpass valve # c) - differential pressure bpass valve +. $n a F-/0 engine with a hdromechanical fuel sstem, how is fuel flow controlled? a) B fuel pressure # b) B electroAhdraulic servo valves /!>s) c) B oil hdraulics . $n the !/$6 the discharge resistor a) allows sufficient voltage to be stored to provide relight facilities up to ,<<< ft. b) protects the unit from e3cessive voltages. # c) allows the capacitors to discharge when the unit is switched off. 4. - modular constructed gas turbine engine means that # a) its ma;or assemblies can be removed and replaced b) all engines have a specific component laout c) the engine is constructed b the vertical assembl techniue

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7. he purpose of a high ppass ducted fan engine is to # a) improve efficienc b) improve thrust c) reduce si*e 9. &hen using a test set to test an /( thermocouple circuit # a) no compensation for ambient temperature is reuired b) onl consider ambient temperature compensation if the ambient temperature is over 2pring sealed bellows b) wo bellows against atmospheric pressure c) here is no compensation 41. -n /5F is produced b a thermocouple. his is sensed a) at the hot ;unction # b) at the cold ;unction c) between the hot and cold ;unctions 42. >upervisor //0 sends its output to the a) fuel valve # b) !56@FF( c) /( thermocouple circuit 4%. =atiometer pointer movement is achieved b a) one coil providing a torue against a permanent magnet b) two opposing coils providing a torue in a varing magnetic field # c) two opposing coils providing a torue in a permanent magnetic field 4+. - fuel flow transmitter reuires a motor or a snchronous motor to have a a) constant voltage within small tolerances # b) constant freuenc within small tolerances c) low /5F as it is immersed in fuel 4. - boost gauge measures # a) absolute pressure on the inlet port b) brake mean effective pressure c) gauge pressure at the in;ector 44. 'n a thermocouple circuit on a non F-/0 engine, what is the purpose of the ballast resistor? a) o compensate for ambient temperatures # b) o standardise both engineCs /( readings

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c) o compensate for altitude 47. Boost pressure is measured in # a) inches of !g b) inches of water c) ">$ 49. "ower is ad;usted in a gas turbine engine b a) increasing airflow to the combustion chamber b) increasing air and fuel flow # c) increasing fuel flow 4:. he /"= reading is taken from a ratio of # a) ;et pipe pressure to compressor inlet pressure b) compressor deliver pressure to compressor inlet pressure c) turbine inlet pressure to compressor deliver pressure 7<. he basic gas turbine engine ccle is # a) induction, compression, combustion, e3pansion, e3haust b) induction, compression, e3pansion, combustion, e3haust c) compression, combustion, induction, e3pansion, e3haust 71. he high bpass duct a) drives a cabin air compressor b) provides engine cooling # c) improves propulsive efficienc 72. $f an engines fadec sstem loses air data permanentl the pilot will # a) select alternate pitot static b) switch to alt on the relevent //0 c) turn that //0 off 7%. -n /"= sstem reads slightl over 1, this would mean a) the transmitter datum point has moved and needs replacing # b) no action reuired this is normal c) the indicator needs reAcalibrating back to 1 7+. 5anifold pressure is measured # a) at inlet port above and below ambient conditions b) at inlet port above and below standard atmosphere at sea level c) at inlet port indicating boost pressure 7. - temperature indicating sstem incorporating a resistance bulb on a selected range has pointer movement # a) proportional to bulb resistance b) inversel proportional to bulb resistance c) resistance does not affect pointer movement 74. $n a ducted fan engine, the fan is driven b the a) accessor gearbo3

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b) turbine c) air passing over the compressor

77. $n a F-/0 sstem, active control switchover occurs # a) on shutdown b) when channels - and B are health c) on engine startup onl 79. (as turbines work on the a) otto ccle # b) braton ccle c) diesel ccle 7:. 'il sstems consists of a) 2 sstems # b) % sstems c) + sstems 9<. &ith the //0 in control the throttle levers are alwas a) in the full forward position b) in the full aft position # c) anwhere between the full fwd and full aft positions 91. urboprop thermocouple probes are # a) rapid response b) stagnation c) surface mounted 92. "ropelling no**le provide a) pressure thrust b) velocit thrust # c) pressure and velocit thrust 9%. !ow are the combustion chambers cooled? a) B l.p compressor air # b) B h.p compressor air c) B fan pressure air 9+. Fan blade speed is measured b # a) phonic wheel b) drag cup and tachometer c) edd currents 9. Fadecs operate b a) 2 controlling 1 operating b) 1 controlling 1 operating # c) 2 units each capable of independent control 94. &hen a thermocouple fails, the temperature reading will a) over read

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b) under read c) sta the same

97. -n aircraft fling at 9<
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a) it has lower pressure so greater reliabilit b) it can take into account rpm, pressure ambient) and e.g.t. c) has no need for fl weights and governors

:7. &hen the full authorit fuel control unit is changed, the rating plug # a) stas with the engine b) stas with the F-F0 c) is replaced ever time :9. he //0 is powered and able to operate via a) onl a dedicated alternator b) the aircraft electrical sstem # c) he //0 is capable of being powered b both independentl depending on conditions ::. he //0 uses # a) -=$80 +2: formatted data b) -=$80 42: formatted data c) uses neither -=$80 +2: or 42: formatted data 1<<. he fuel metering unit has direct inputs via a) onl the //0 b) the //0 and the fire control handle # c) the //0, fire control handle and the engine master switch 1<1. he optimum turbine speed is defined as # a) the most efficient speed of the turbine b) 1<< rpm of the engine c) :  rpm of the engine 1<2. -n increase in fuel flow through the impeller tpe fuel flow transmitter is measured b a) drum lags impeller # b) impeller lags turbine c) decreasing angle between the two 1<%. 8o power to /( is indicated b # a) ellow flag in front counter b) bug moves in the 3 direction c) bug moves in the  direction 1<+. 0onnection to a tachogenerator # a) % phase star b) % phase delta c) 2 phase star 1<. - short circuit in a d.c ratiometer will give a) ma3 scale reading b) *ero scale reading # c) min scale reading

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1<4. -n open circuit in a d.c ratiometer will give # a) ma3 scale reading b) *ero scale reading c) min scale reading 1<7. - compressor shaft rotates on a) sintered bearings # b) ball and roller bearings c) plain bearings 1<9. he //0 changes power settings b a) changing the throttle lever angle # b) changing the fuel flow input c) changing the airflow input 1<:. - torue pressure measuring indicator is fed b # a) direct oil pressure b) differential pneumatic pressure c) servo operated 11<. he tacho generator output hasD a) - fi3ed freuenc # b) - ariable freuenc c) - 0 0urrent output 111. 'n a fuel flow measuring device located on the engine # a) no ad;ustments can be made b) e3ternal ad;ustments can be made for ma3imum rate fuel flow c) e3ternal ad;ustments can be made for minimum rate fuel flow 112. &here is the hot ;unction of a /( thermocouple sstem found? a) $n the indicator b) 6pstream of the combustion chamber # c) ownstream of the combustion chamber 11%. he fan on a turbofan engine is turned b a) induction of the air across the fan into the compressor # b) the turbine section c) the combustion chamber gases 11+. &hen terminating connections for a /( sensing sstem a) ensure that the pins and sockets are correctl crimped and bra*ed b)ensure that all connections are silver soldered # c) ensure that the pins and sockets are of the same material as the leads 11. -n /"= gauge indicates C1C. Eou should a) ad;ust the indicator back to *ero b) replace the indicator, there is no ad;ustment # c) do nothing this is what it should read with the engine shut down.

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114. - (as urbineCs propulsion force is produced b # a) reaction of the rearward moving gasses b) impingement of the gasses on the surrounding air c) induced airflow into the engine 117. $n a single spool gas turbine engine the compressor rev@min is a) more than the turbine speed b) less than the turbine speed # c) eual to the turbine speed 119. - tacho pointer is moved b # a) drag cup coupling b) ac servo motor c) snchronous motor 11:. $n a twin spool engine a) the !" turbine drives both " and !" compressors # b) the " turbine drives the " compressor and the !" turbine drives the !" compressor c) the !" turbine drives the " compressor and the " turbine drives the !" compressor 12<. =elative permeabilit of fuel is also known as a) densit of the fuel b) weight of the fuel # c) dielectric constant of the fuel 121. he ccle of a gas turbine engine is a) completed in one revolution of engine. b) completed in two revolution of the engine. # c) continuous 122. /ngines having two independent moving sstems are a) compound engines # b) twin spool engines c) comple3 engines 12%. 0ompression ratio of compressor of gas turbine /ngine is # a) outlet pressure to $nlet pressure. b) measured across all rotor stages of compressor c) mass of airflow to combustion. 12+. orue pressure indication to measure power output of an engine is a) used in all (as urbine engines. b)not used in (as urbine engines. # c) onl used when engine output pressure is used for torue not for thrust. 12. 5anifold pressure is measured in

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a) direct absolute pressure in Bars b) differential pressure in millibars c) direct absolute pressure in inch of !g

124. picall a torue pressure indication sstem is a) differential pressure tpe b) remote snchronous tpe # c) direct 'il "ressure sensing tpe 127. - tachometer used to measure =ev@5in in turbine engines # a) develops its own power for the sstem b) 29 dc is reuired c) 11 ac is reuired 129. "rimar power for electronic engine control a) 11 ac essential bus. b) on side 11 ac bus bar suppl. # c) "ermanent 5agnet -lternator 12:. eads to measure thermocouple temperature are # a) calibrated for circuit in used and cannot be shortened b) affected b 5agnetic and electrical interference c) insulated b heat legging device to reduce errors in the indication end 1%<. - thermocouple sensing sstem test set reuires # a) a serviceable batter b) 8o power c) 2+ dc 1%1. he !" compressor is powered b # a) the first set of turbines b) the last set of turbines c) the intermediate compressor 1%2. orue is measured in gas turbine engines a) never # b) where there is a free turbine providing the power c) on small pure ;et engines 1%%. &hat is the suppl voltage to tacho generators? a) 29vdc b) 11vac # c) $t has no suppl 1%+. - F-/0 takes measurements of engine speed, # a) temperature and pressure b) temperature c) pressure

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1%. he fuel metering valve in the hdro mechanical unit of a F-/0 sstem is operated b a) hdraulic servo pressure # b) fuel servo pressure c) electrical servo 1%4. Boost pressure is a) atmospheric above ambient b) atmospheric below ambient # c) the absolute of the manifold chamber 1%7. o check@test a temperature indicator ou would # a) connect a decade bo3 in place of the temperature sensing element b) connect a decade bo3 in series with the temperature sensing element c) connect a decade bo3 in parallel with the temperature sensing element 1%9. 0alibration for a ratiometer tpe temperature indicator takes into account a) the material of the coils # b) the material of the sensing element c) the tpe of representation on the dial 1%:. =everse thrust can onl be selected when the throttle is a) 7 power position. b) open. # c) at the idle stop 1+<. 'n a F-/0 engine the //0 # a) has electronic control of the hdroAmechanical fuel control unit in all modes b) has electronic control of the hdroAmechanical fuel control in some modes c) has mechanical control of the hdroAmechanical fuel control sstem 1+1. /"= is a measure of # a) e3haust pressure compared to compressor inlet pressure b) e3haust pressure compared to combustor pressure c) combustion pressure compared to compressor inlet pressure 1+2. &hat e3actl does a thermocouple measure? a) he difference between the hot and cold ;unction. # b) !ot ;unction temperature. c) 0old ;unction temperature. 1+%. $n a temperature sensing ratiometer what determines the actual temperature? # a) he material of the sensor b) he material of the sensing coil c) he material of the balancing coil

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1++. orue is a useful measure # a) on engines where a portion of thrust produces torue b) on engines which onl produce thrust c) on all engines 1+. Boost pressure is a measure of # a) manifold pressure b) atmospheric pressure plus turbocharger inlet pressure c) atmospheric pressure less turbocharger inlet pressure 1+4. he test switch of a continuous loop fire detector gives a # a) continuit check b) bonding check c) insulation check 1+7. &hat are the tpes of continuous fire detection sstem? # a) 0apacitive and resistive b) 0apacitive c) $nductive and capacitive 1+9. uring normal running conditions a) combustion is continuousl supported b ignition b) combustion is intermittentl supported b ignition # c) combustion is self supporting 1+:. &hat indication does the pilot receive that thrust reversers have deploed? a) - feeling of rapid deceleration b) -n audible warning # c) - seuence of lights 1<. on a fi3ed pitch propeller single engine aircraft, what is indicated as a measure of power? a) 'il pressure # b) /ngine speed c) 0linder head temperature 11. in a turbine engine used to drive a propeller, the power from the engine is a) ma;orit for ;et reaction and the residual to drive the prop # b) the ma;orit of power is used to drive the prop, with the residual giving a ;et reaction c) the power is divided euall. 12. he term 5ass Flow as used in a ;et engine refers to # a) total mass of air divided b time. b) total volume multiplied b velocit of airflow. c) total volume of air multiplied b relative densit. 1%. he !56 of a F-/0 engine increases fuel flow b increasing

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a) air flow through the compressor b) hdraulic servo pressure c) servo fuel pressure

1+. he //0 controls thrust b a) 5oving the throttles # b) $ncreasing fuel flow c) 0ontrolling the bleed valves 1. &hen an /( harness goes through a bulkhead disconnect ou must ensure that # a) pins and sockets are of the same material as the thermocouple leads. b) the pins etc should be silver soldered and their connections properl made. c) pins and sockets must be correctl crimped or braised and tested using a 2< olt megger 14. he phsical law used for calibrating a thermocouple indicator depends on # a) the materials of the sensing element. b) the materials of the coils in the meter. c) the range that the meter is reuired to read A i.e. operating scale 17. 'n a gas turbine engine, what is the fan driven b? a) !" turbine # b) " turbine c) $" turbine 19. he starter light is on during a start ccle low voltage electrical starter). a) his is normal for %< seconds, take no action # b) $f the light stas on after %< seconds action is reuired c) $ndicates electrical power is flowing to the starter 1:. - 0 starter motor disconnects due to a) current increasing switching off an overspeed rela # b) current decreasing switching off an overspeed rela c) a centrifugal switch that acts like an overspeed rela 14<. (as tpe fire wires operate b utili*ing # a) the change in the gas pressure b) the change in the gas dilectric level c) the change in the electrical resistance of the gas 141. $ntegrated fuel flow gives a) fuel flow and acceleration b) average fuel flow # c) total fuel consumed

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Module_14

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