DGCA Module 15 Gas Turbine Engine from 1st Session of 2019 covers key concepts like engine construction, compressors, turbines, accessories, and performance. The paper includes both theory and practical-based questions for thorough understanding and exam preparation.
Module 15
1st Session of 2019
1. Blend of kerosene and gasoline.
A) JET-A
B) JET-B
C) JET A1
2. APU load compressor supply.
A) Electrical
B) Pneumatic
C) Both
3. Exhaust cone assembly consist of.
A) Outer shell, inner cone, strut & tie rod
B) Outer nozzle, inner nozzle & strut
C) Outer cone, inner cone, tie rod
4. Water injection used in aircraft when aircraft run at.
A) Low power
B) High power
C) Idle power
5. To prevent dirt/dust from entering engine at inlet.
A) Vortex generator used
B) Vortex destroyer used
C) None
6. In turboprop engine SHP taken from.
A) Free turbine
B) Output shaft
C) Propeller
7. Convergent duct.
A) Velocity decrease
B) Pressure increase.
C) Temperature decrease
8. Function of centrifugal switch in APU.
A) Ignition and starting circuit
B) Overspeed protection circuit
C) Governorspeed indication
D) ALL
9. Halon 1301
A) Freon
B) Freon 13 TM.
C) Bromochloromethane
10. Oil temperature indication is taken from.
A) Inlet of pressure pump
B) Outlet of pressure pump
C) Scavenge subsystem
11. Small orifices in duplex burner provide.
A) Low pressure fuel
B) High pressure fuel
C) Both
12. Starter shear section permits shaft to shear if.
A) Speed to engine is high
B) Starter torque to engine is excessive
C) Starter air pressure is too low
13. Purity of aviation fuel is compromised by.
A) Hydrocarbon
B) Water
C) Fuel mixing
14. GTE incorporating forward location of engine.
A) Reduce damage from foreign ingested material
B) Reduce vibration
C) Have high duct loss
15. MTCS.
A) Engine mount bolt inspected by MPI
B) Engine mount inspected by DPI
C) Both
16. Which part of GTE experiences highest temperature.
A) Combustion
B) Nozzle vane
C) Turbine
17. Carbon seal.
A) Usually spring loaded
B) Rest against surface to provide sealed cavity
C) Prevent oil leaking out along shaft
D) All
18. Turboshaft engine drive shaft.
A) Short shaft, two flexible coupling end and provide transmission
B) Long shaft, flexible coupling end & provide transmission
C) Short shaft, rigid coupling end and provide transmission
19. Inlet recessed in side of fuselage is.
A) Pitot
B) Scoop
C) Flush
20. Fire detection which measures rise in temp compared to a reference.
A) Temperature is
B) Thermal switch
C) Lindsberg
D) Thermocouple
21. In turboshaft engine, which unit allows autorotation without driving rotor.
A) Over-wheeling unit
B) Free wheeling unit
C) Both + Sprag clutch
22. Ignition system on modern aircraft is.
A) Inductor discharge
B) Capacitor discharge
C) Transformer discharge
23. Which is not function of centrifugal switch in APU.
A) Ignition and starting circuit
B) Overspeed protection circuit
C) Governorspeed indication
D) Switching circuit
24. Thrust augmentation in GTE is provided by adding water at.
A) Compressor inlet
B) Combustion inlet
C) Combustion outlet
25. Load taken by ball bearing.
A) Radial only
B) Axial & radial only
C) Only thrust load
26. Principle which affect inlet condition are.
A) Speed of aircraft, attitude of aircraft & ambient air
B) Stagnation density
C) Both
27. During thrust augmentation water passes.
A) 1/3 at compressor inlet high pressure & 2/3 at low pressure at diffuser
B) 1/3 at compressor inlet low pressure & 2/3 at high pressure at diffuser
C) 2/3 at compressor inlet low pressure & 1/3 at high pressure at diffuser
28. MTCS turboprop delivers power.
A) From RGB to propeller
B) From gas generator to RGB
C) From propeller to gas generator
29. In fuel cooler oil cooler.
A) Oil flow around tube
B) Oil flow in tube
C) Fuel pressure higher than oil
30. Restricted leakage.
A) Oil seal
B) Seal
C) Labyrinth seal
31. Fuel system during storage preserved with.
A) Mineral based
B) Synthetic based
C) Petroleum based
32. Can type.
A) 8 aperture
B) 9 aperture
C) 6 aperture
33. ACC stands for.
A) Active Clearance Control
B) Actual Clearance Control
C) Aircraft Clearance Control
34. Mach speed is speed of object in relation
A) Speed of sound
B) Local speed of sound
C) Ground speed
35. Thermocouple.
A) Chrome alumel
B) Iron constantan
C) Chromel constantin
36. When increasing fuel, variable to consider is.
A) EGT
B) TIT
C) TGT
37. Cooling of nozzle done by bleed air from.
A) HPC
B) LPC
C) Ambient air
38. Inlet guide vane.
A) Convert few K.E into P.E
B) Convert max K.E to P.E
C) Direct combustion gas to turbine in axial direction
D) Both A & C
39. What prevents combustion from flaming out by reducing velocity.
A) Swirl vane
B) Diffuser
C) IGV
40. In centrifugal compressor, manifold air supply to.
A) Diffuser
B) Combustion chamber
C) Inlet of compressor
41. In centrifugal compressor, diffuser vanes are.
A) Convergent
B) Divergent
C) Convergent-divergent
42. MTCS engine mount.
A) Mounted on firewall
B) Mounting done with nut, bolt and rubber pad utilised
43. Total pressure at outlet of compressor is.
A) P2T2
B) P3T3
C) P4T4
D) P5T5
44. Mass × velocity = Momentum is of.
A) Stationary object
B) Moving object
45. EPR measures.
A) Compressor inlet to compressor outlet
B) Combustion inlet to turbine outlet
C) Compressor inlet to turbine outlet
46. MTCS Turbojet.
A) Large acceleration to charge large mass of air
B) Small acceleration to charge large mass of air
C) Large acceleration to charge small mass of air
47. Thrust reverser.
A) Mechanical blockage block exhaust air from rear of nozzle
B) Mechanical blockage divert the air opposite direction from thrust being produced
C) Both
48. Which parameter is not considered for take off.
A) EGT
B) Inlet temperature
C) Relative humidity
49. Deicing.
A) Easy to maintain
B) Reliable
C) Should not have additional weight penalty
D) All
50. Power assurance check.
A) Ensure throttle is free of obstruction
B) Throttle movement full movement range
C)
D) All
51. Axial flow compressor.
A) Greater pressure rise per stage
B) High ram efficiency
C) Less susceptible to FOD
52. Fire occurs during engine start.
A) Close the engine immediately
B) Close the shut off valve and continue motoring engine until fire exits
C) Close the shut off valve and continue motoring engine if fire doesn’t exist discard engine
53. Electrical starter.
A) Pawl and ratchet mechanism
B) Automatic clutch release mechanism
C) The solenoid and gear drive mechanism
54. Newly stored engine checked for satisfactory condition.
A) After 24hrs with safe indication pink
B) Within 24hrs with safe indication pink
C) Within 24hrs with safe indication blue
D) After 24hrs with safe indication blue
55. Humidity indicator checked.
A) Every 10 days
B) Every 30 days
C) Every 90 days
56. APU primarily used for.
A) Continuous throughout flight
B) Used for main engine starting
C) Normal flight operation
57. Oil temperature.
A) Temperature bulb & indicator
B) Thermocouple & indicator
C) Both
59. IGV installation.
A) Nozzle vane assembled loose and welded to allow for thermal expansion
B) Nozzle vane are welded or riveted into position with segmented cut on inner or outer shroud to allow for thermal expansion
C) Both
60. When engine changed.
A) Rigging to airframe to pylon through pushpull rod
B) Rigging from pylon to engine
C) Rigging from airframe to engine control
D) All
61. Ignition system.
A) Two igniter plug diametrically opposite in combustion liner
B) One igniter plug used
C) Two igniter plug diametrically in combustion liner
62. Purpose of EEC.
A) To save fuel & crew workload
B) To improve engine weight
C) To reduce combustion temperature
63. Pressure relief valve system.
A) Control line to deliver to bearing
B) Varies with engine speed
C) Controls exhaust pressure
64. To prevent seizure of case and turbine.
A) Passive tip clearance is used
B) Cooling air is used
C) Active tip clearance is used
65. Vapour lock
A) Converts liquid pressure to air pressure
B) Prevents air from mixing with fuel
C) Occurs due to excess oil pressure
66. Vapour lock is due to.
A) Low pressure, high turbulence & high temperature
B) High pressure, low temperature & laminar flow
C) High density, low vapor pressure
67. Turboshaft is preferred where requirement is of.
A) Reliability, small size, light weight
B) High fuel consumption
C) Supersonic operation
68. Vapour lock is due to.
A) Low fuel temperature and high pressure
B) High fuel temperature, low pressure & turbulence of fuel
C) High pressure and low turbulence
69. In turboprop engine, constant rpm is function of.
A) ECB
B) FADEC
C) TIT
70. Corrosive type of compound are which type of product.
A) Synthetic based
B) Petroleum based
C) Vegetable based
71. N1 speed is measured by.
A) Tachometer
B) Speed pickup sensor
C) Torque meter
72. In axial flow compressors, air flow is parallel to.
A) Radial direction
B) Axial direction
C) Tangential direction
73. Turbine nozzle guide vanes convert.
A) Heat to pressure
B) Pressure energy to velocity
C) Velocity to pressure
74. Purpose of turbine stator vanes is to.
A) Increase turbine RPM
B) Direct airflow to rotor blades at correct angle
C) Decrease exhaust velocity
75. Intercoolers in multi-stage compressors are used to.
A) Increase fuel consumption
B) Reduce air temperature between stages
C) Increase air temperature
76. The main purpose of reverse thrust is.
A) Reduce fuel consumption
B) Reduce landing distance
C) Increase engine speed
77. Accessory gearbox of GTE is driven by.
A) Turbine
B) Compressor
C) Engine core
78. Thermal anti-icing in engines uses.
A) Freon
B) Bleed air
C) Engine oil
79. Nozzle diaphragm is also called.
A) Turbine nozzle
B) Turbine blade
C) Rotor
80. In gas turbine engine, specific fuel consumption (SFC) is.
A) Directly proportional to thrust
B) Inversely proportional to thrust
C) Fuel flow per unit thrust
81. Turbine blade cooling is essential due to.
A) Excessive pressure
B) High velocity
C) High temperature
82. Spool refers to.
A) A set of rotor and stator in a stage
B) A compressor-turbine shaft assembly
C) A combustion can
83. Flame tube is part of.
A) Exhaust
B) Combustion chamber
C) Compressor
84. Typical fuel used in modern jet engines is
A) Diesel
B) JET A-1
C) Avgas
85. When engine is running at idle, fuel flow is controlled by.
A) EGT
B) FCU
C) TIT
86. Turbine is connected to compressor by.
A) Gears
B) Shaft
C) Belts
87. Can-annular type combustion chamber is a combination of.
A) Annular and axial
B) Can and annular
C) Can and straight flow
88. Jet pipe pressure is measured to compute.
A) N1
B) EGT
C) EPR
89. Flame out is most likely to occur due to.
A) High pressure
B) Rich mixture
C) Lean mixture
90. EGT is measured at
A) Before turbine
B) Between turbine stages
C) At turbine outlet
91. What is the purpose of a wet sump lubrication system.
A) To store oil in an external tank
B) To collect oil in a chamber within the engine casing
C) To increase engine cooling
D) To reduce engine weight
92. What does an engine oil cooler do.
A) Keeps the engine oil at an optimal temperature
B) Increases oil pressure
C) Decreases fuel consumption
D) Reduces exhaust temperature
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