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Gas Turbine Engines > Fact Sheet 1 > Flashcards

Fact Sheet 1 Flashcards

1
Q

thrust is felt on both static and _________ components

A

thrust is felt on both static and ROTATING components

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2
Q

if pressure increases, temperature _________ (charles law)

A

if pressure increases, temperature INCREASES (charles law)

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3
Q

temperature reduction would increase density and therefore increase ______

A

temperature reduction would increase density and therefore increase THRUST

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4
Q

in a divergent duct, pressure __________ when velocity decreases

A

in a divergent duct, pressure INCREASES when velocity decreases

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5
Q

a power plant is a _________ engine with everything connected on the aircraft

A

a power plant is a COMPLETE engine with everything connected on the aircraft

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6
Q

gas turbine engines are stopped by closing the HP ____

A

gas turbine engines are stopped by closing the HP COCK

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7
Q

free turbines have no mechanical connection to the ___________

A

free turbines have no mechanical connection to the COMPRESSORS

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8
Q

during the off, the fan speed would be ____ than the HP compressor speed

A

during the off, the fan speed would be LESS than the HP compressor speed

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9
Q

rapid movement of throttle can induce compressor _____

A

rapid movement of throttle can induce compressor SURGE

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10
Q

increase in relative humidity would ________ density and thrust

A

increase in relative humidity would DECREASE density and thrust

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11
Q

increase in intake density would ________ shaft horse power on a turbo prop

A

increase in intake density would INCREASE shaft horse power on a turbo prop

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12
Q

a large jet pipe area would ______ exhaust velocity and thrust

A

a large jet pipe area would LOWER exhaust velocity and thrust

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13
Q

to maintain thrust in a climb, EPR constant and so ___ must increase

A

to maintain thrust in a climb, EPR constant and so RPM must increase

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14
Q

subsonic engine intakes are designed to give ____ ram ratio at high speed

A

subsonic engine intakes are designed to give HIGH ram ratio at high speed

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15
Q

with an increase in altitude, a low bypass would have a ________ in thrust with an ________ in RPM

A

with an increase in altitude, a low bypass would have a DECREASE in thrust with an INCREASE in RPM

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16
Q

a bypass ratio of 5:1 would indicate that the cold stream is _ times greater than the hot stream

A

a bypass ratio of 5:1 would indicate that the cold stream is 5 times greater than the hot stream

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17
Q

pitot type intakes are divergent so maximum amount of ___ compression

A

pitot type intakes are divergent so maximum amount of RAM compression

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18
Q

ram effect will ________ pressure and thrust

A

ram effect will INCREASE pressure and thrust

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19
Q

hot air anti-icing ________ engine power output

A

hot air anti-icing DECREASES engine power output

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20
Q

compressor blade twisting is to give correct ___ from root to tip

A

compressor blade twisting is to give correct AOA from root to tip

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21
Q

airflow scheduling on axial flow altered for both __________ and ________ changes

A

airflow scheduling on axial flow altered for both TEMPERATURE and PRESSURE changes

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22
Q

VIGVs reduce possibility of compressor _____ below design RPM

A

VIGVs reduce possibility of compressor STALL below design RPM

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23
Q

ram ratio is _______ pressure compared to _____ pressure

A

ram ratio is AMBIENT pressure compared to INLET pressure

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24
Q

as engine speed increases, compressor pressure ratio _________

A

as engine speed increases, compressor pressure ratio INCREASES

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25
Q

combustion chamber swirl vanes anchor and _________ flame

A

combustion chamber swirl vanes anchor and STABILISE flame

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26
Q

can-annular combustion chambers consist of a number of flame tubes in an ________ casing

A

can-annular combustion chambers consist of a number of flame tubes in an ANNULAR casing

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27
Q

combustion in gas turbine engines ideally done at constant _________

A

combustion in gas turbine engines ideally done at constant PRESSURE

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28
Q

impulse/reaction turbines pressure _________ from root to tip with velocity ___________ from leading edge to trailing edge

A

impulse/reaction turbines pressure INCREASES from root to tip with velocity INCREASING from leading edge to trailing edge

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29
Q

fir tree roots allow blade torque and tensile load to be transmitted through to ____

A

fir tree roots allow blade torque and tensile load to be transmitted through to DISC

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30
Q

HP NGV’s are subjected to temperatures _____ their melting points and cooled by __ compressor air only

A

HP NGV’s are subjected to temperatures ABOVE their melting points and cooled by HP compressor air only

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31
Q

exhaust struts support the ____ and _________ the gas flow

A

exhaust struts support the CONE and STRAIGHTEN the gas flow

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32
Q

nozzles are chocked when gas flow is ______

A

nozzles are chocked when gas flow is SONIC

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33
Q

turbo-jet engines require noise ___________

A

turbo-jet engines require noise SUPPRESSION

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34
Q

thrust reverse deflects exhaust gas through ___ degrees

A

thrust reverse deflects exhaust gas through 135 degrees

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35
Q

full thrust reverse is approximately ____ of forward thrust

A

full thrust reverse is approximately HALF of forward thrust

36
Q

thrust reverse on fan engines reverses ____ stream only

A

thrust reverse on fan engines reverses COLD stream only

37
Q

bearing chamber pressure ________ pressure jet delivery

A

bearing chamber pressure OPPOSES pressure jet delivery

38
Q

typical carbon seal located by _______ and fitted to _____ mounted collar

A

typical carbon seal located by SPRINGS and fitted to SHAFT mounted collar

39
Q

straight roller bearing normally used for carrying ______ loads in gas turbine engines

A

straight roller bearing normally used for carrying RADIAL loads in gas turbine engines

40
Q

high oil temperature can lead to ___________

A

high oil temperature can lead to OXIDATION

41
Q

a gallon of fuel with an SG of 0.8 would weight _lbs

A

a gallon of fuel with an SG of 0.8 would weight 8lbs

42
Q

FSII prevents the ______ in fuel freezing

A

FSII prevents the WATER in fuel freezing

43
Q

oil flow in ________ ______ system controlled by limiting pressure in feed line

A

oil flow in PRESSURE RELIEF system controlled by limiting pressure in feed line

44
Q

full flow oil system has no ______ valve or filter __ ____

A

full flow oil system has no RELIEF valve or filter BY PASS

45
Q

engine oil pumps are normally ____ gear types

A

engine oil pumps are normally SPUR gear types

46
Q

squeezed film oil bearings used in engines to reduce __________

A

squeezed film oil bearings used in engines to reduce VIBRATION

47
Q

FADEC receives ___ data since thrust varies with mass flow, which varies with altitude and speed

A

FADEC receives AIR data since thrust varies with mass flow, which varies with altitude and speed

48
Q

on large aircraft, both FADEC are operating; one in control, the other receiving data but with command drivers _________

A

on large aircraft, both FADEC are operating; one in control, the other receiving data but with command drivers DISABLED

49
Q

on turbo-jet, as forward speed increases, SFC _________

A

on turbo-jet, as forward speed increases, SFC INCREASES

50
Q

in a barometric pressure control; a decrease in P1 will ________ servo pressure and pump stroke

A

in a barometric pressure control; a decrease in P1 will DECREASE servo pressure and pump stroke

51
Q

control of fuel supply during rapid acceleration prevents high ___ ____ temperature and possible _____

A

control of fuel supply during rapid acceleration prevents high JET PIPE temperature and possible SURGE

52
Q

FADEC has speed inputs from fan and turbine to detect fan shaft _______

A

FADEC has speed inputs from fan and turbine to detect fan shaft FAILURE

53
Q

ice formation in fuel reduced by using an ____

A

ice formation in fuel reduced by using an FCOC

54
Q

air starter motors have an _______ turbine

A

air starter motors have an IMPULSE turbine

55
Q

during ground operation, generators would be cooled by an _______ flow of atmospheric air

A

during ground operation, generators would be cooled by an INDUCED flow of atmospheric air

56
Q

LP cooling air outlet ___________ switch indicates engine overheat

A

LP cooling air outlet THERMOSTATIC switch indicates engine overheat

57
Q

fire prevented from spreading to cool zone by __________ pressure

A

fire prevented from spreading to cool zone by DIFFERENTIAL pressure

58
Q

air is bled by bleed valve to prevent _______ rear stages of the compressor

A

air is bled by bleed valve to prevent CHOKING rear stages of the compressor

59
Q

air starter ducts are normally _____ bore aluminium

A

air starter ducts are normally LARGE bore aluminium

60
Q

discharge resistors allow capacitors to discharge when HEIU is switched ___

A

discharge resistors allow capacitors to discharge when HEIU is switched OFF

61
Q

ballast resistors in engine temp system are fitted in _______ to give same reading for all engines

A

ballast resistors in engine temp system are fitted in PARALLEL to give same reading for all engines

62
Q

flight deck indicator for TGT indication uses _____________ which need an electrical supply

A

flight deck indicator for TGT indication uses THERMOCOUPLES which need an electrical supply

63
Q

EGT indicator is used to monitor the _________ of the turbine and engine in general

A

EGT indicator is used to monitor the INTEGRITY of the turbine and engine in general

64
Q

______ wheels operate on the principal of inductive reactance

A

PHONIC wheels operate on the principal of inductive reactance

65
Q

torque is the __________ to rotation

A

torque is the RESISTANCE to rotation

66
Q

_________ is used in water injection systems to increase the engine RPM/power

A

METHANOL is used in water injection systems to increase the engine RPM/power

67
Q

nozzle will increase in size when reheat selected to reduce ____ ________ in the exhaust and so preventing surge

A

nozzle will increase in size when reheat selected to reduce BACK PRESSURE in the exhaust and so preventing surge

68
Q

engine output will ________ on a turbo prop as aircraft increases

A

engine output will INCREASE on a turbo prop as aircraft increases

69
Q

jet thrust in a turboprop engine is approximately __%

A

jet thrust in a turboprop engine is approximately 10%

70
Q

_________ devices on turboprop prevent propeller failure

A

OVERSPEED devices on turboprop prevent propeller failure

71
Q

___________ power in turbo shaft engines is shaft power plus thrust

A

EQUIVALENT power in turbo shaft engines is shaft power plus thrust

72
Q

a free turbine will rotate ______ than the gas generator

A

a free turbine will rotate SLOWER than the gas generator

73
Q

APU fuel supply is taken from the ____ aircraft fuel tanks

A

APU fuel supply is taken from the MAIN aircraft fuel tanks

74
Q

APU switches operate at 3, 9 and 11_%

A

APU switches operate at 35, 95 and 110%

75
Q

engine mountings allow for radial and axial __________

A

engine mountings allow for radial and axial EXPANSION

76
Q

engine pods are _______ in order to stop the building up of flammable vapours and for engine cooling

A

engine pods are VENTED in order to stop the building up of flammable vapours and for engine cooling

77
Q

primary fuel stop fitted to engine ___

A

primary fuel stop fitted to engine FCU

78
Q

short circuits in __________ type fire wire do not five a false warning

A

short circuits in CAPACITANCE type fire wire do not five a false warning

79
Q

main fire extinguishers operated manually from ______ ____ only

A

main fire extinguishers operated manually from FLIGHT DECK only

80
Q

halogenic fire extinguishers are severely corrosive to __________

A

halogenic fire extinguishers are severely corrosive to TITANIUM

81
Q

before starting an engine, instruments should show indications _________ with existing conditions

A

before starting an engine, instruments should show indications EXISTING with existing conditions

82
Q

____ will alert engineers of an impending failure

A

AIDS will alert engineers of an impending failure

83
Q

a _____ vibration sensor could cause a spurious vibration indication

A

a LOOSE vibration sensor could cause a spurious vibration indication

84
Q

turbine rotor blades suffer ______ rupture

A

turbine rotor blades suffer STRESS rupture

85
Q

humidity indicator in MVP bag is ____ if still satisfactory

A

humidity indicator in MVP bag is BLUE if still satisfactory

86
Q

sponginess in MVP bag material by fuel or oil contamination may be limited by washing with ______

A

sponginess in MVP bag material by fuel or oil contamination may be limited by washing with WATER

Gas Turbine Engines (36 decks)

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