DGCA-OCTOBER 2013
JET ENGINE
1. Calorific value of fuel is:
a) Heat energy per weight of the molecule
b) Heat energy per pound of fuel
2. Titanium should not be cleaned with
a) Trichloroethylene
3. OAT has increased significantly but TGT is same at ground. In high power run everything is normal, the snag is
a) CIT system failure
4. Propeller thrust reverser advantage is
a) To reduce the landing roll
b) Provides high fuel efficiency
5. MTCS regarding Auto-ignition
a) Auto ignition is a design feature to ensure instantaneous ignition at the time of take-off, inlet icing conditions & at the time of flame out
b) To provide relight/ starting
c) To disengage the starter once self-sustaining RPM has reached
d) ATA
6. APU automatically shut-down in case of
a) Low oil pressure
b) High oil temperature
c) Overspeed
d) ATA
7. Good fuel atomization s an advantage of
a) Swirl type fuel nozzle
b) Simplex fuel nozzle
8. TSFC is
a) Inversely proportional to efficiency
b) Directly proportional to efficiency
9. Oil pressure is measured by
a) Autosyn
10. Front bearing in GTE is
a) Ball bearing
b) Roller bearing
c) As in (a) also known as locator bearing
d) As in (b) also known as locator bearing
11. Most important factor for selection of NGV material
a) Heat resistant
b) Creep resistant
c) Corrosion resistant
d) Fatigue resistant
12. Vapour lock in fuel system is due to
a) Low ambient pressure c) High temperature
b) Turbulence of fuel d) ATA
13. Ignitor plug used in GTE
a) Operates at high altitude & high temperature
b) Operates at high altitude and low temperature
c) Applied voltage is high
d) Both (b) & (c)
14. Engine is to be shipped safe moisture condition is indicated by
a) Pink
b) Blue
c) Yellow
15. Engine rumbles during starting
a) Fuel system malfunction
b) P & D malfunction
c) Cracked air duct
d) ATA
16. Engine Trim Curve is used for trimming an engine to compensate for any thrust deterioration which might be due to
a) Loss in inlet duct
b) Accumulation of deposit dust/ dirt on compressor blades
17. Regarding jet engine
a) At higher engine speed thrust increases with small increase in RPM
18. The ultimate limiting factor of turbine engine
a) Turbine Inlet Temperature
19. Thrust reverser operation is more effective at
a) Low speed
b) High speed
c) Subsonic speed
20. Beta range of propeller aircraft
a) On ground produce zero & negative thrust
21. Engine Pressure Ratio is the total ratio pressure b/w
a) Ratio of turbine outlet to the front of compressor
22. The E.G.T is a relative indication of
a) Turbine Inlet Temperature
23. Immediate shut-off of fuel is achieved by
a) Staging v/v
b) Priority v/v
c) Check v/v
24. Propeller thrust is a result of
a) Area of decreased pressure at the front of propeller
25. Minimum no. Of spark plug used in GTE is
a) 2
26. Two common types of thrust reverser in use are doors & vanes
a) Blocker & reaction
b) Clamshell & cascade
c) Clamshell and impulse
27. Unique property of synthetic oil compared to petroleum based oils is
a) It has high viscosity & can take high load
b) Low evaporation rate, low coke & carbon deposit
c) It do not affect paint and do not cause blistering
d) ATA
28. Most commonly used stall prevention devices are
a) DGV, IGV, SGV
b) IGV, SGV, acceleration control unit
29. Ignition system that doesn’t present any interference problem
a) Capacitor type- High Tension
b) Capacitor type- Low Tension
c) Glow plugs
30. Identify the given cycle
PRESSURE
VOLUME
a) Brayton cycle
b) Otto cycle
31. Commonly used fuel in civil aircraft
a) Jet-A & Jet A1
32. Turbofan engine is
a) Turbojet engine with long fan blades at the front few stages of compressor
b) Turbojet engine with a fan at the front
33. MTCS
a) CP T Wa 778
550
34. In high by-pass turbofan
a) Secondary air is used for thrust reversing
35. MTCS
a) T/R should produce 75% of the total thrust
b) Should prevent re ingestion of hot gases at low ground speeds
36. MTCS
a) Delicate blading towards the rear makes axial flow compressor less susceptible to FOD
b) Close fit b/w stator & rotor blades for efficient pumping
c) Wide operating range
37. Flat rated engine
a) Thrust decreases with increase in temperature but can be maintained upto certain operating range
38. Bearing which supports growth
a) Ball bearing
b) Radial bearing
39. MTCS
a) Neoprene elastomer seals are used in very high temperature regions
b) Carbon seals cannot be used in hot section
c) Labyrinth seals is effective only at high RPM
40. Ans. Impulse at root and reaction at tip
41. Hot spot is an indication of fuel system malfunction and
a) Combustion chamber malfunction
42. Oil is increasing in quantity evidenced by
a) FCOC
43. MTCS
a) FADEC controls HMU
b) FADEC does not control HMU
c) Thrust determining factor of FADEC IS N2
44. FADEC
a) Channel ‘A’ is main channel & channel ‘B’ functions only during failure
b) Channel ‘A’ & ‘B’ are alternatively selected during engine start
c) Channel ‘A’ & ‘B’ are not interconnected as a fail-safe feature
45. Fuel and oil are classified as
a) Class B fire
46. Source of oil particles are detected by
a) SOAP analysis
b) Chip detector
c) Filter condition
47. Hole in fan blades are provided to
a) Cool the fan blade
b) Prevent vibration
c) Resonance effect
48. Greatest stress to propeller is caused by
a) Centrifugal force
b) Thrust force
c) Torque force
49. In GTE regarding cushioning
a) Fuel control hits its stop before the cockpit quadrant hits its stop
50. Aerodynamic performance check includes
a) EGT, RPM, EPR & Throttle position
51. During oil analysis Mg particles found, suspended
a) Gearbox
52. Blade station is measured from
a) Centre line of hub
53. Torque bending force
a) Causes the blade to rotate in a direction opposite to that of blade rotation
54. Ans. Centrifugal twisting force is greater than aerodynamic twisting force & tends to decrease the blade angle
55. Hot start due to
a) Rich Fuel/ Air ratio
b) False / Hung start
c) Malfunctioning of fuel nozzle
d) ATA
56. Advantage of axial flow compressor
a) High Pressure per stage
b) High weight
c) High RAM efficiency
57. Function of burner section
a) To add heat energy to the air as it flows through the engine
b) To add mechanical energy to the air as it flows through the engine
58. 3-D cam function
a) To hold T.I.T
b) To prevent stall
c) To prevent surge
d) ATA
59. Operation of APU is monitored by
a) Oil pressure
b) Oil temperature
c) E.G.T
d) ATA
60. Fail safe feature in F.M.U
a) Shut-off valve
b) Pump
c) Relief valve
d) Minimum fuel flow stop
61. Propeller blade angle is the angle b/w
a) Blade chord and the plane of rotation
62. Disadvantage of turboprop when compared to turbojet
a) High thrust at low forward speed
b) High TSFC
c) Reverse thrust
d) Complicated design and more weight
63. Engine is not operated in restricted operating range due to
a) Propeller vibration
64. Modern engine uses which type of oil sump
a) Dry sump
65. Exhaust cone noise produced is less in which engine
a) Turbojet
b) Turboprop
c) Turbofan
66. Annular igniter plug protrudes inside combustion chamber
67. Function of stator vanes
a) Convert kinetic energy into pressure energy
68. During trend monitoring all parameters are increasing, probable cause is
a) Hot air leak
b) Damage in few blades/ vanes
c) Compressor contamination
69. Modern turbine section parts rings, discs, gears, blades are manufactured by
a) Forging
b) Casting
c) Machining
d) Powder metallurgy
70. Elastic limit- definition
71. Last chance filter
a) To filter before oil enters bearing chamber
72. Advantage of tip speed
a) Multi spool
73. Oil find tail pipe, what is to be done
a) Replace engine
b) Bearing seal replacement
c) Pressurising air seal leak and is to be replaced
74. Shock wave produced from a pointed object
a) Normal
b) Oblique
c) Expansion
75. Relief valve in oil system is not augmenting, what happens to the flow rate
a) Increases with increase in engine RPM
b) Decreases with increase in RPM
c) Remains constant
d) Linearly proportional to RPM
76. Typical ignition system uses
a) 1-intermitent exciter box, 2-intermediate lead
2-high tension lead
2-continous exciter
77. Subsonic duct should have
a) Low RAM recovery point
78. Oil pressure is measured from
a) Outlet of pump
b) Gearbox
79. MTCS
a) At high power if CDP fails, RPM will stabilize at idle
b) At low power if CDP fails, RPM will increase
c) During starting if CDP fails, hung start
d) ATA
80. Position sensors in G.T.E
a) LVDT
b) RVDT
c) Resolver
d) ATA
81. If air speed increases what happens to thrust
a) Increases
b) Decreases
c) Remains constant
82. Ignition system
a) High voltage + High Amperage
b) High voltage + High heat intensity
c) High voltage + high Energy
d) ATA
83. Fault observed in bleed valve stuck open(jammed) it will make the engine to work at
a) Higher RPM than usual
b) Lower RPM than usual
c) Remains same
84. Air during starting for air turbine starter is obtained from
a) From auxiliary unit available with airport facility
b) From auxiliary air starter unit
c) From another engine
d) ATA
85. MTCS
a) Water-Alcohol are used in GTE due to high combustion efficiency
b) Water alone will provide more thrust per pound due to high latent heat of vaporisation
c) Mineralised water alone is used since it provides more thrust
86. Tachometer used in GTE is used
a) To find RPM in cruise flight
b) RPM during engine start and to indicate overspeed condition
87. Variable vane system excludes unwanted air during
a) Low speed
b) High speed
88. Manual override in the form of T- handle is provided to rotate the starter air valve it should be closed after engine self-accelerating speed to prevent
a) High EGT
b) Oil splashing out from the starter
c) Starter overspeeding the engine
89. Surge
90. Conversion of fuel energy into kinetic energy
a) Thermal efficiency
91. Trend monitoring
Prepared by: Liby John Joseph
JET ENGINE
1. Calorific value of fuel is:
a) Heat energy per weight of the molecule
b) Heat energy per pound of fuel
2. Titanium should not be cleaned with
a) Trichloroethylene
3. OAT has increased significantly but TGT is same at ground. In high power run everything is normal, the snag is
a) CIT system failure
4. Propeller thrust reverser advantage is
a) To reduce the landing roll
b) Provides high fuel efficiency
5. MTCS regarding Auto-ignition
a) Auto ignition is a design feature to ensure instantaneous ignition at the time of take-off, inlet icing conditions & at the time of flame out
b) To provide relight/ starting
c) To disengage the starter once self-sustaining RPM has reached
d) ATA
6. APU automatically shut-down in case of
a) Low oil pressure
b) High oil temperature
c) Overspeed
d) ATA
7. Good fuel atomization s an advantage of
a) Swirl type fuel nozzle
b) Simplex fuel nozzle
8. TSFC is
a) Inversely proportional to efficiency
b) Directly proportional to efficiency
9. Oil pressure is measured by
a) Autosyn
10. Front bearing in GTE is
a) Ball bearing
b) Roller bearing
c) As in (a) also known as locator bearing
d) As in (b) also known as locator bearing
11. Most important factor for selection of NGV material
a) Heat resistant
b) Creep resistant
c) Corrosion resistant
d) Fatigue resistant
12. Vapour lock in fuel system is due to
a) Low ambient pressure c) High temperature
b) Turbulence of fuel d) ATA
13. Ignitor plug used in GTE
a) Operates at high altitude & high temperature
b) Operates at high altitude and low temperature
c) Applied voltage is high
d) Both (b) & (c)
14. Engine is to be shipped safe moisture condition is indicated by
a) Pink
b) Blue
c) Yellow
15. Engine rumbles during starting
a) Fuel system malfunction
b) P & D malfunction
c) Cracked air duct
d) ATA
16. Engine Trim Curve is used for trimming an engine to compensate for any thrust deterioration which might be due to
a) Loss in inlet duct
b) Accumulation of deposit dust/ dirt on compressor blades
17. Regarding jet engine
a) At higher engine speed thrust increases with small increase in RPM
18. The ultimate limiting factor of turbine engine
a) Turbine Inlet Temperature
19. Thrust reverser operation is more effective at
a) Low speed
b) High speed
c) Subsonic speed
20. Beta range of propeller aircraft
a) On ground produce zero & negative thrust
21. Engine Pressure Ratio is the total ratio pressure b/w
a) Ratio of turbine outlet to the front of compressor
22. The E.G.T is a relative indication of
a) Turbine Inlet Temperature
23. Immediate shut-off of fuel is achieved by
a) Staging v/v
b) Priority v/v
c) Check v/v
24. Propeller thrust is a result of
a) Area of decreased pressure at the front of propeller
25. Minimum no. Of spark plug used in GTE is
a) 2
26. Two common types of thrust reverser in use are doors & vanes
a) Blocker & reaction
b) Clamshell & cascade
c) Clamshell and impulse
27. Unique property of synthetic oil compared to petroleum based oils is
a) It has high viscosity & can take high load
b) Low evaporation rate, low coke & carbon deposit
c) It do not affect paint and do not cause blistering
d) ATA
28. Most commonly used stall prevention devices are
a) DGV, IGV, SGV
b) IGV, SGV, acceleration control unit
29. Ignition system that doesn’t present any interference problem
a) Capacitor type- High Tension
b) Capacitor type- Low Tension
c) Glow plugs
30. Identify the given cycle
PRESSURE
VOLUME
a) Brayton cycle
b) Otto cycle
31. Commonly used fuel in civil aircraft
a) Jet-A & Jet A1
32. Turbofan engine is
a) Turbojet engine with long fan blades at the front few stages of compressor
b) Turbojet engine with a fan at the front
33. MTCS
a) CP T Wa 778
550
34. In high by-pass turbofan
a) Secondary air is used for thrust reversing
35. MTCS
a) T/R should produce 75% of the total thrust
b) Should prevent re ingestion of hot gases at low ground speeds
36. MTCS
a) Delicate blading towards the rear makes axial flow compressor less susceptible to FOD
b) Close fit b/w stator & rotor blades for efficient pumping
c) Wide operating range
37. Flat rated engine
a) Thrust decreases with increase in temperature but can be maintained upto certain operating range
38. Bearing which supports growth
a) Ball bearing
b) Radial bearing
39. MTCS
a) Neoprene elastomer seals are used in very high temperature regions
b) Carbon seals cannot be used in hot section
c) Labyrinth seals is effective only at high RPM
40. Ans. Impulse at root and reaction at tip
41. Hot spot is an indication of fuel system malfunction and
a) Combustion chamber malfunction
42. Oil is increasing in quantity evidenced by
a) FCOC
43. MTCS
a) FADEC controls HMU
b) FADEC does not control HMU
c) Thrust determining factor of FADEC IS N2
44. FADEC
a) Channel ‘A’ is main channel & channel ‘B’ functions only during failure
b) Channel ‘A’ & ‘B’ are alternatively selected during engine start
c) Channel ‘A’ & ‘B’ are not interconnected as a fail-safe feature
45. Fuel and oil are classified as
a) Class B fire
46. Source of oil particles are detected by
a) SOAP analysis
b) Chip detector
c) Filter condition
47. Hole in fan blades are provided to
a) Cool the fan blade
b) Prevent vibration
c) Resonance effect
48. Greatest stress to propeller is caused by
a) Centrifugal force
b) Thrust force
c) Torque force
49. In GTE regarding cushioning
a) Fuel control hits its stop before the cockpit quadrant hits its stop
50. Aerodynamic performance check includes
a) EGT, RPM, EPR & Throttle position
51. During oil analysis Mg particles found, suspended
a) Gearbox
52. Blade station is measured from
a) Centre line of hub
53. Torque bending force
a) Causes the blade to rotate in a direction opposite to that of blade rotation
54. Ans. Centrifugal twisting force is greater than aerodynamic twisting force & tends to decrease the blade angle
55. Hot start due to
a) Rich Fuel/ Air ratio
b) False / Hung start
c) Malfunctioning of fuel nozzle
d) ATA
56. Advantage of axial flow compressor
a) High Pressure per stage
b) High weight
c) High RAM efficiency
57. Function of burner section
a) To add heat energy to the air as it flows through the engine
b) To add mechanical energy to the air as it flows through the engine
58. 3-D cam function
a) To hold T.I.T
b) To prevent stall
c) To prevent surge
d) ATA
59. Operation of APU is monitored by
a) Oil pressure
b) Oil temperature
c) E.G.T
d) ATA
60. Fail safe feature in F.M.U
a) Shut-off valve
b) Pump
c) Relief valve
d) Minimum fuel flow stop
61. Propeller blade angle is the angle b/w
a) Blade chord and the plane of rotation
62. Disadvantage of turboprop when compared to turbojet
a) High thrust at low forward speed
b) High TSFC
c) Reverse thrust
d) Complicated design and more weight
63. Engine is not operated in restricted operating range due to
a) Propeller vibration
64. Modern engine uses which type of oil sump
a) Dry sump
65. Exhaust cone noise produced is less in which engine
a) Turbojet
b) Turboprop
c) Turbofan
66. Annular igniter plug protrudes inside combustion chamber
67. Function of stator vanes
a) Convert kinetic energy into pressure energy
68. During trend monitoring all parameters are increasing, probable cause is
a) Hot air leak
b) Damage in few blades/ vanes
c) Compressor contamination
69. Modern turbine section parts rings, discs, gears, blades are manufactured by
a) Forging
b) Casting
c) Machining
d) Powder metallurgy
70. Elastic limit- definition
71. Last chance filter
a) To filter before oil enters bearing chamber
72. Advantage of tip speed
a) Multi spool
73. Oil find tail pipe, what is to be done
a) Replace engine
b) Bearing seal replacement
c) Pressurising air seal leak and is to be replaced
74. Shock wave produced from a pointed object
a) Normal
b) Oblique
c) Expansion
75. Relief valve in oil system is not augmenting, what happens to the flow rate
a) Increases with increase in engine RPM
b) Decreases with increase in RPM
c) Remains constant
d) Linearly proportional to RPM
76. Typical ignition system uses
a) 1-intermitent exciter box, 2-intermediate lead
2-high tension lead
2-continous exciter
77. Subsonic duct should have
a) Low RAM recovery point
78. Oil pressure is measured from
a) Outlet of pump
b) Gearbox
79. MTCS
a) At high power if CDP fails, RPM will stabilize at idle
b) At low power if CDP fails, RPM will increase
c) During starting if CDP fails, hung start
d) ATA
80. Position sensors in G.T.E
a) LVDT
b) RVDT
c) Resolver
d) ATA
81. If air speed increases what happens to thrust
a) Increases
b) Decreases
c) Remains constant
82. Ignition system
a) High voltage + High Amperage
b) High voltage + High heat intensity
c) High voltage + high Energy
d) ATA
83. Fault observed in bleed valve stuck open(jammed) it will make the engine to work at
a) Higher RPM than usual
b) Lower RPM than usual
c) Remains same
84. Air during starting for air turbine starter is obtained from
a) From auxiliary unit available with airport facility
b) From auxiliary air starter unit
c) From another engine
d) ATA
85. MTCS
a) Water-Alcohol are used in GTE due to high combustion efficiency
b) Water alone will provide more thrust per pound due to high latent heat of vaporisation
c) Mineralised water alone is used since it provides more thrust
86. Tachometer used in GTE is used
a) To find RPM in cruise flight
b) RPM during engine start and to indicate overspeed condition
87. Variable vane system excludes unwanted air during
a) Low speed
b) High speed
88. Manual override in the form of T- handle is provided to rotate the starter air valve it should be closed after engine self-accelerating speed to prevent
a) High EGT
b) Oil splashing out from the starter
c) Starter overspeeding the engine
89. Surge
90. Conversion of fuel energy into kinetic energy
a) Thermal efficiency
91. Trend monitoring
Prepared by: Liby John Joseph
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