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IN (CT JUNE 2013)

AIRCRAFT MAINTANANCE ENGINEER LICENSE EXAMINATION

GAS TURBINE ENGINE
SESSION – JUN 2013

1. At what Point in Axial flow turbojet engine will the highest gas Pressure occurs?
a) At the Turbine section
b) Within the burner section
c) At the compressor outlet

2. Which statement is true regarding Jet engine

a) At the higher engine speed thrust increase rapidly with small increase in RPM
b) At the lower engine speed thrust increase rapidly with small increase in RPM

3. In NTS
a) Ring gear senses NTS
b) Blade Angle increases automatically to feather
c) Both a & b
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4. When the CDP sensor fail during cruise condition the high power if engine will
a) Flame out

5. Mark the correct statement TSS-:

a) manual feather at the time of take off

6. PRSOV
a) downstream to the fuel meter ing v/v to maintain HP rise at low flow

7. Auto Ignition
a) It is design to insure instantaneous ignition if an engine begins to loose power
from inlet icing & is in danger of flaming out
b) Use for relight
c) cut off the starter speed when engine reaches self accelerating speed
d) All

8. Property of NGV material

a) Heat Resistance

9. Hot section include

a) combuster,turbine,exhaust
b) turbine,compressor,tailpipe
c) Diffuser,combuster,turbine

10. Turbine blade failure due to

a) creep
b) corrosion
c) crack in turbine due fatigue
d) All

11. On twin shaft engine front bearing used

a) Ball bearing
b) roller bearing
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c) As in a & also known locater bearing

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13. what igniter plug project inside the engine

a) annular plug
b) spark plug
c) glow plug

14. Oil found in tail pipe it indicate

a) scavenge pump failure
b) Air pressur ization fail
c) seal to be replace

15. Mg particle found during inspection indicate problem with

a) Gearbox
b) Bearing

16.Stagnation density
a) Directly proportion to thrust at inlet
b) Inversely proportion to thrust at inlet
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17.A/c speed at which Pr rise equal to the friction lose

a) Ram Recover y point

18. TSFC is
a) Inver sely propor tional to Efficiency
b) directly proportional to Efficiency

19. Oil quantity increase

a) FCOC faulty

20.Turbofan uses TGT,N2,single as feedback single to regulate the fuel flow through amplifier for which the
N2 sensor used is
a) Tacho gener ator

21. Where is the highest pressure in gas turbine engine

a) Diffuser
b) NGV

22. Purpose of last chance Filter

a) Straining the oil just before passes in the spray nozzle
b) To filter the Oil immediately before it enters the main bear ing

23. Assuring turbine blade to engine case clearance are kopt minimum by controlling case Temp
a) ACC

24. Propeller synchronization

a) multiple engine to reduce vibration
b) Improve balancing
c) Synchronization of single & multiengine

25.High tension lead integrity check by

a) Micro Ammeter
b) Ac voltmeter
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c) Dc voltmeter
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27.vapour lock due to

a) atmospheric pressure
b) High pressure
c) b & Turbulances
d) ALL

28. Fuel or Oil fire classified as

a) class A c) class C
b) class B b) class D

29. The pitch movement of the propeller blade is controlled by a hydraulic servo piston the increase of oil pr
in the servo make the propeller blade to
a) Low pitch Rotation
b) High pitch Rotation
c) Remain at low RPM
d) High pitch with high RPM

30.MTCS Regarding Turbojet

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a) small mass of air accelerate with large velocity

31. MTCS
a) Turbo drives its thrust by small acceleration
b) turbojet drives its thrust by large acceleration with small mass of Air
c) Both a & b

32. In turbojet where in the Highest jet velocity of malfunction of fuel Nozzle
a) Turbine Rotor
b) combuster

33. Hot spot on the tail cone is good indication of malfunction of fuel nozzle &
a) combustion chamber damage

34. Force Acting on propeller

a) Torque bending force to tend to move the propeller in opposite direction
b) centrifugal force high on the hub & blade
c) Thrust Bending force tends to move the propeller in the forward direction
d) all

35.The force which tends to turn the blade to a high blade angle
a) Aerodynamic twisting force
b) centrifugal twisting force
c) Torque bending force

36. Flat rated engine

a) Engine will provide rated thrust at high temp within limit

37. Can type burner inspection

a) NGV distortion
b) Crack in turbine blade
c) cause Replacement
d) all
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38.Engine has high EGT as target EPR

a) Engine out of Tr im
b) Bleed valve malfunction

39. Compressor damage

a) Hang up during starting
b) Vibrate at high RPM
c) all

40. Engine rumble during starting and at low power cruise condition
a) P & D v/v malfunction
b) Cracked air duct
c) Fuel control malfunction
d) all

41. High power to weight Ratio

a) Electric stator
b) Starter generator
c) Air turbine
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42. When power is to expected EPR,F/F,EGT rpm is high but not change in EPR
a) RPM & EGT gage defective
b) RPM & F/F gage defective
c) EPR defective
43. EPR
a) Indication of Thrust

44. Trimming under high tail wind

a) False High TDP
b) False Low TDP
c) a & Low Tr im
d) b & Low Trim

45. Torque is not indicate on the gage but RPM correctly show
a) Bad Torque meter
b) ground lead
c) open lead
d) all

46. when anti Icing is on

a) ERP fluctuate
b) Rise in EGT
c) EGT & RPM increase
d) Flickering the EPR

47. Anti surge device

a) DGV,IGV,SGV
b) Acceleration unit,SGV
c) IGV, Acceleration

48. IGV function

a) Reduce velocity
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b) Increase Pr
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c) Change the direction

d) all

49. In axial flow compressor stator vanes acts as

a) convergent
b) small diffuser
c) Nozzle

50. Axial velocity near constant compressor

a) Annular area gradual reduce from front to rear

51.Propose of Breather unit

a) Prevent the foaming of the Oil
b) Allow aeration of oil & air vent the air to atmosphere & retain oil

52. Purpose of breathing unit.

a) Prevent the foaming of oil.
b) Allow aeration of oil & air , vent the air to atmosphere & retain oil.
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53. Axial velocity constant in compressor.

a) Annulus area gradually reduces from front to rear.

54. In Engine torque meter, if oil temp. Increases then torque.

a) Decrease
b) Increase
c) remains same.

55. What is the critical limit factor of Jet Engine.

a) TIT
b) CIT

56. What is the primary purpose of the oil breather pr. Sys that is used in turbine engine.
a) Prevent foaming of the oil
b) Always aeration go the oil better lubricant because of the air/oil mist
c) Provide a proper oil spr ay patterns from the main bearing oil jets

57. When the compressor bleed valve jammed?

a) Higher than normal RPM
b) Lower than nor mal RPM
c) Doesn’t affect the engine RPM

58. V.S.V
a) Lower airflow at low RPM
b) Higher airflow at low RPM

59. Too small clearance b/w Impeller & case

a) Vibration

60. Unstable airflow at the surrounding blade & the AOA is high
a) Lean die out
b) Rich Blow out
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c) surge
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61. Airspeed increase, than thrust ( when all parameter constant)

a) Decrease
b) Increase

62. When RPM constant, CIT & OAT is increase then thrust
a) Decrease
b) Increase
c) Remain constant

63. In the turbo prop engine the torque meter depends on

a) Prop RPM & Airspeed
b) Altitude & Ambt temp
c) Both

64. Impulse Turbine primary

a) All pr energy converted into kinetic energy
b) Inlet & exit area same in turbine blade & convert Pr energy to kinetic energy
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65. Why engine Acceleration & deceleration controlled

a) To prevent blow out
b) To prevent turbine will contact with case
c) To give a time to rotor to cool

67. 75% of air used in Gas Turbine engine

a) cooling
b) combustion

68.Swirling vanes are used in fuel Nozzles

a) Rapid combustion
b) To handle more air
c) To handle more fuel
d) All

69.Smooth file used for recountering the

a) Blending
b) Buffeting

70. Trends Analysis of parameter with red line was for new & overhaul engine
a) Un-condition
b) Power Assur ance check
c) trend monitoring

71.Correction in FCU
a) Rigging control
b) Schedule control
c) Tr imming control
d) all

72. Struts or vanes purpose

a) loads through the gas path to the outer stationary
b) Minimize disruption or pr. Loss in the gas path
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c) Path for lubrication Oil

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d) all

73. About Seals

a) Neoprene seals used in high temp condition
b) Carbon seal not used in hot section
c) Labyrinth seal used only in high speed
d) all

74. Property of synthetic oil

a) Don’t deposit rust on gear
b) Gum Coke deposit
c) Good lubrication at high temp
d) all

75. In simplex nozzle after shutdown cut the fuel

a) stop v/v
b) check v/v
c) Relief v/v
76. T/R used in turbofan
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a) Blocker door used for secondary air

b) a & cascade vanes are used
c) b & Translating sleeves ate used
d) c & primary airflow continuous to give thrust

77.Purpose of three dimensional cam in fuel control computer is to

a) limit the turbine blade temp by limiting the flow
b) prevent stall
c) surge
d) all

78. When scheduling the F/F what should be within limit

a) TIT
b) CIT
c) RPM

79.When stating GTE compressor does not develop power

a) CI total temp
b) RPM (N1/N2)
c) Burner pressure

80.MTSC
a) FADEC control the HMU
b) FADEC doesn’t control the HMU
c) FADEC gets the power from N2
d) all

81.Vibration , EGT, F/F, Speed,

a) Charge, EMF, DC Pulse, Frequency
b) Charge, DC Pulse, Frequency, EMF
c) EMF, DC Pulse, Frequency, Charge

82. The hot gases of CC & impinge on the turbine deflect the airflow & velocity
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a) Increase
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b) Decrease

83. When applying the tension load it will not deform

a) Tensile limit
b) Elastic limit
c) Yield Strength limit

84. When shock waves are formed at sharp object, but still supersonic
a) Normal shocks wave
b) Expansion shock wave
c) Oblique shock wave

85.Magnetic Reluctance probe used for

a) Vibration
b) speed

86.Duplex ball bearing takes

a) Increase Radial & axial Load
b) Decrease Radial & axial Load
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c) Increase in Radial Load & slightly reduction in axial load

d) Fail safe feature
87.First stage of compressor increase
a) Pressure
b) Velocity
c) Both

88. Oil pressure indicator indicate

a) Engine oil Pressure
b) Oil pr at the outlet of pump
c) Quantity of oil
d) all

89. IF the length of thermocouple lead then

a) Low indication on the gage
b) Excess temp in the engine
c) Both a & b

90. In starter generator

a) Two armature is used
b) Ser ies winding is used for high starting power & shunt winding is used for gener ator
c) It has three external connection
d) all

91. MTCS While Tracking a propeller blade

a) Constant speed propeller is at low pitch
b) Controlled speed propeller is at low pitch
c) Both a & b

92.An engine Trimming is used for trimming an engine in field

a) Up trim an engine to compensate for inlet duct loss
b) To compensate for any thrust deterior ation which might result from accumulated deposit of?
dir t or scale on the compressor blade
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c) Both a & b
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93. Exhaust cone is a part of

a) Air frame
b) Engine
c) Independent

94. MTCS
a) Excessive slow air at low altitude cause flame out
b) High flow of air can also cause flame out
c) All lean flame out at low altitude
d) Both a & b

95. When the aircraft is rest, thrust computed by

a) Gross thrust
b) Net thrust
c) Mass thrust

96. When OAT is fluctuating but engine is not sensing then snag in
a) CIT
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97. Engine lean flame out die

a) Is due to high fuel flow pr. at low engine speed in high altitude
b) Is due to low fuel pr. low engine speed at high altitude
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