DGCA Module 12
1st Session of 2017
1. What is the shape and colour identification mark for Class-B fire extinguisher.
A) Blue colour circle
B) Red colour rectangle
C) Green colour triangle
Answer
2. Which architecture is used in 3rd Generation IFE system.
A) Closed architecture
B) Open Architecture
C) Hybrid architecture
Answer
3. In B777 ELMS, ELMS stands for what.
A) Electrical Load Management System
B) Engine Load Monitoring System
C) Electronic Lighting Management System
Answer
4. How many basic components are present in an aircraft air-conditioning system.
A) 3 system
B) 5-6 system
C) 8-10 system
Answer
5. In vapour cycle air-conditioning system, which device is used to silence the blower fan noise.
A) Silencer
B) Spill pipe
C) Load stop
Answer
6. What is the full form of DME in aircraft navigation system.
A) Distance Measuring Equipment
B) Digital Measuring Equipment
C) Direction Measuring Equipment
Answer
7. Which are the basic parts of semi-monocoque structure.
A) Frames, skin and bolts
B) Skin, former, longeron and stringer
C) Spar, ribs and skin
Answer
8. What is the advantage of centrifugal boost pump over positive displacement pump.
A) No need for pressure relief valve.
B) Pump can be located anywhere in the fuel tank.
C) Long durability
Answer
9. Where are life jacket inspection records generally kept.
A) At gate
B) Along with life jacket
C) In maintenance base
Answer
10. Semi-rigid rotor system is also known as what.
A) Fully articulated rotor
B) Hub bar arrangement
C) Rigid rotor system
Answer
11. Main rotor blade anti-icing is generally done by which method.
A) Pneumatic method
B) Electric method
C) Chemical method
Answer
12. Windshield anti-icing protection is provided by which method.
A) Thermal pneumatic and thermal electric
B) Chemical coating
C) Mechanical wiper system
Answer
13. Clutch is mandatory on which type of engine.
A) Compression ignition engine.
B) Turbine engine.
C) Reciprocating engine.
Answer
14. Which lighting is more easily seen through smoke than incandescent or other point sources.
A) Fluorescent lighting
B) Electroluminescent lighting
C) Halogen lighting
Answer
15. Emergency pop-out float location is where in aircraft.
A) Cockpit area
B) Baggage area
C) Passenger cabin
Answer
16. On landing in skid type landing gear, which part takes landing loads.
A) Gas tubes
B) Hydraulic damper
C) Axle beam
Answer
17. Which safety systems are installed in vapour cycle system.
A) Pressure relief and thermal protection system
B) Hydraulic protection system
C) Fuel shut-off system
Answer
18. Helicopter moving on the ground with its own power having wheels and brakes is called what type of landing gear arrangement.
A) Skid type landing gear
B) Wheel type landing gear arrangement
C) Float type landing gear
Answer
19. What is the cause of tyre removal from aircraft.
A) Carcass ply damage
B) Low tyre pressure
C) Wheel imbalance
Answer
20. Inflation of tyre without aircraft on jacks should not be carried out below which temperature.
A) -10°C
B) -18°C
C) -25°C
Answer
21. Windshield de-icing is done by which methods.
A) Thermal pneumatic, thermal electric and electric
B) Hydraulic and chemical method
C) Mechanical wiping method
Answer
22. Main rotor blade ice protection is generally provided by which system.
A) Electric system
B) Pneumatic system
C) Chemical system
Answer
23. Which protection device is used in hydraulic system.
A) Hydraulic fuse
B) Thermal fuse
C) Electrical fuse
Answer
24. What is the disadvantage of dry air used in aircraft.
A) Low pressure problem
B) Drying causes skin irritation
C) High temperature effect
Answer
25. Which properties are required for hydraulic fluid.
A) Low viscosity, high flash point and high vapour point
B) High freezing point and low flash point
C) High density and low lubrication
Answer
26. What is viscosity.
A) Resistance to flow
B) Resistance to heat
C) Resistance to pressure
Answer
27. Which test is performed using white bucket method in aircraft fuel system.
A) Fuel contamination test
B) Hydraulic leakage test
C) Oil pressure test
Answer
28. White bucket test is used to inspect which contamination in fuel.
A) Water only
B) Particulates, microbial debris, contaminants and water content
C) Fuel colour only
Answer
29. Why is expansion space provided in aircraft fuel tank.
A) To increase fuel pressure
B) To allow fuel expansion due to temperature rise
C) To reduce fuel weight
Answer
30. Thermocouple system works on which principle.
A) Change in pressure
B) Rise of oil temperature
C) Change in density
Answer
31. Class-A fire involves which materials.
A) Ordinary combustible materials
B) Electrical equipment
C) Flammable liquids
Answer
32. Dynamic secure test is used in which aircraft.
A) Single piston engine aircraft
B) Single piston engine aeroplane
C) Single turbine engine aeroplane
Answer
33. Oxygen requirement becomes mandatory above which altitude.
A) 7200 ft
B) 10000 ft
C) 12000 ft
Answer
34. ELT is actuated by which force.
A) Magnetic force
B) G-force
C) Hydraulic force
Answer
35. In aircraft operating over water, how many ELTs are required.
A) One ELT
B) Two ELTs
C) Three ELTs
Answer
36. What is the service life of life jacket lighting.
A) 2 years
B) 5 years
C) 10 years
Answer
37. Where is the life jacket locator light generally located.
A) Cabin ceiling
B) Inside life jacket box
C) Cockpit panel
Answer
38. What is the advantage of transistor.
A) Low power consumption and high reliability
B) Heavy weight
C) High heat generation
Answer
39. Which winding is used in aircraft generator.
A) Differential winding
B) Compound wound
C) Shunt winding
Answer
40. ARINC 429 is related to what.
A) Fuel system
B) Data bus communication
C) Hydraulic system
Answer
41. What should be done when replacing lead-acid battery with Ni-Cd battery.
A) Replace complete charging procedure
B) Use same charger
C) Increase battery voltage
Answer
42. Instruments are classified into how many categories based on operation.
A) Two categories
B) Three categories
C) Five categories
Answer
43. What is gyroscopic precession.
A) Tilting movement at right angle to applied force
B) Rotational imbalance
C) Change in speed of rotor
Answer
44. What is the purpose of ADF.
A) Automatic direction finding
B) Air data function
C) Altitude data frequency
Answer
45. What is the full form of DME.
A) Distance Measuring Equipment
B) Digital Measuring Equipment
C) Direction Monitoring Equipment
Answer
46. What is the purpose of DME.
A) To measure aircraft distance from ground station
B) To measure fuel quantity
C) To measure altitude
Answer
47. What is the advantage of High Frequency Data Link.
A) Secure data management
B) Open world communication
C) Audio broadcasting
Answer
48. What is the best maintenance action if play is found in control rod end.
A) Lubricate rod end
B) Replace control rod end
C) Tighten cable only
Answer
49. Fuel tank purging is generally done by using which gas.
A) Oxygen
B) Carbon dioxide (CO₂)
C) Steam
Answer
50. What is the advantage of zinc chromating.
A) Increase hardness
B) Make corrosion resistance
C) Increase conductivity
Answer
51. What is the purpose of bonding lead in aircraft.
A) To increase voltage
B) Bonding and grounding purpose
C) To reduce fuel flow
Answer
52. If a rivet is to be replaced by huck rivet, which type of blind rivet is used.
A) Friction lock rivet
B) Riv-nut
C) Cherry-lock rivet
Answer
53. Which type of mounting is generally used for aircraft engines.
A) Flexible mounting
B) Spring mounting
C) Rigid mounting
Answer
54. In autorotation, if collective pitch is changed, what happens to AOA.
A) AOA increases and rotor RPM decreases
B) AOA decreases and rotor RPM increases
C) No effect on AOA
Answer
55. Droop compensator is mainly associated with which helicopter system.
A) Rotor balancing
B) Helicopter maintenance
C) Fuel control system
Answer
56. Which are the primary stresses acting on aircraft structure.
A) Compression and torsion only
B) Tension, compression, shear, bending and torsion
C) Pressure and vibration only
Answer
57. Semi-rigid rotor system is also known as which design.
A) Underslung design
B) Fully articulated design
C) Rigid rotor design
Answer
58. What is ground effect in helicopter operation.
A) Increase in rotor efficiency near the ground
B) Reduction in engine power
C) Increase in fuel flow
Answer
59. Lavatory is required according to which seating class arrangement.
A) Cargo class seating
B) Passenger seating class
C) Crew seating only
Answer
60. Bending stress is a combination of which stresses.
A) Tension and compression
B) Shear and torsion
C) Pressure and vibration
Answer
61. Which parts are included in semi-monocoque fuselage construction.
A) Skin, frames, stringers and longerons
B) Only skin and ribs
C) Spar and bulkhead only
Answer
62. Which protection system is used in vapour cycle system.
A) Thermal overload protection system
B) Hydraulic protection system
C) Pneumatic isolation system
Answer
63. What is the minimum operating requirement of ELT.
A) Automatic emergency transmission
B) Cabin lighting indication
C) Fuel quantity indication
Answer
64. What is the advantage of paper resources in aircraft maintenance.
A) Require special equipment for access
B) Self-contained and no special equipment needed to access information
C) Difficult to store
Answer
65. What is the purpose of Fatigue Critical Structures (FCS) monitoring.
A) To improve paint quality
B) To detect cracks and structural deformation before catastrophic failure
C) To increase engine efficiency
Answer
66. Aircraft data loading system provides which function.
A) Upload and download data to and from onboard maintenance system
B) Fuel transfer operation
C) Hydraulic pressure control
Answer
67. Aircraft printer is used for printing what.
A) Navigation charts only
B) Aircraft maintenance faults
C) Passenger boarding details
Answer
68. Cargo and service compartment lights are controlled by what.
A) Hydraulic valves
B) Switches near entrance or inside the compartments
C) Central fuel switch
Answer
69. What is ACARS in aircraft communication system.
A) Aircraft Communication Addressing and Reporting System
B) Automatic Cabin Alert Reporting System
C) Airborne Control and Radar System
Answer
70. HFDL downlink sends what information.
A) Passenger entertainment data
B) Aircraft operational data to airline operational centre
C) Weather radar image only
Answer
71. What is bonding in aircraft electrical system.
A) Connecting two or more conducting objects to minimize potential difference
B) Increasing insulation resistance
C) Ground testing of battery
Answer
72. What is grounding in aircraft electrical system.
A) Protection against fuel leakage
B) Return path for current
C) Increase in electrical load
Answer
73. Earthing in aircraft is done for what purpose.
A) To increase voltage supply
B) To dissipate static charge while aircraft is being serviced
C) To improve fuel efficiency
Answer
74. Which type of winding is used in aircraft generator.
A) Cumulative winding
B) Differential winding
C) Series winding
Answer
75. What is the advantage of HFDL in aircraft communication.
A) Enables air traffic services to handle busier and more congested airspace
B) Reduces fuel consumption only
C) Provides cabin entertainment
Answer
76. What is the purpose of pitot probe in aircraft.
A) Measure static pressure only
B) Measure dynamic pressure for airspeed indication
C) Measure fuel pressure
Answer
77. O-ring seals are capable of sealing in which direction.
A) Only one direction
B) Both directions
C) Upward direction only
Answer
78. In vapour cycling cooling two air circulation is.
A) Equal
B) Less effective
C) More effective
Answer
79. Which type pump has no rotating parts.
A) Vane type
B) Gear type
C) Centrifugal type
D) No rotating parts
Answer
80. In aircraft structure the part takes both tension and compression load.
A) Longeron and stringer
B) Former and bulkhead
C) Longeron and bulkhead
Answer
81. Helicopter rotor blades are manufactured by.
A) Vacuum bagging
B) Filament winding
Answer
82. Heat treatment process is carried out by.
A) Heating step wise
B) Cooling step wise
C) Heating and cooling step wise
Answer
83. Rotor balancing with or without blade depends on.
A) Design of rotor assembly
B) Mean weight of the rotor
C) Rotor complexity
D) Size and complexity of assembly
Answer
84. Landing gear safety switch is provided on.
A) Main LG shock strut
B) Nose LG shock strut
Answer
85. Drag brace to shock strut is provided to.
A) Center the wheel
B) Steering the aircraft
C) Longitudinal stability
Answer
86. Static inverters are not protected for.
A) Over heating
B) AC DC reversed
C) Over voltage
D) Over charging
Answer
87. Electrical insulation is checked for.
A) Continuity
B) Resistance
C) Breakdown of resistor
Answer
88. In magnaflux inspection DC power is not available.
A) Pass AC through Fleming coil
B) DC rheostat
C) Heating of point
D) Harmoning
Answer
89. Eddy current losses are :
A) Conductivity
B) Permeability
C) Hysteresis
Answer
90. Bearings are lubricated by.
A) Low temperature grease
B) High temperature grease
C) As per the type of bearings
Answer
91. Bending tab on rotor blade.
A) Tab up blade up
B) Tab down blade down
C) Tab up blade down
Answer
92. Horizontal stabilizer is used to.
A) Auto change in pitching
B) Trim the h/c
C) M/R back
Answer
93. Landing gear compression occur.
A) Inner tube travels out
B) Hydraulic fluid passes through orifice
C) —
Answer
94. Brake spongy action to be rectified by.
A) Bleeding the system
B) Adjusting
C) Shock strut load
Answer
95. If main rotor blade is not twisted, lift depends upon.
A) Square of radius
B) Square of speed
C) —
Answer
96. For sweeping of blade first complete.
A) Alignment of blade
B) Disconnect the blade
C) Statically balancing
Answer
97. Fatigue crack is formed by.
A) Ageing
B) Reversal of stress cycle
C) —
Answer
98. For broaching PVC the resin needed is.
A) Epoxy
B) Polyester
C) A and b are correct
Answer
99. Servo tab is used for.
A) Offsetting the pitch change horn
B) Giving anti effect
C) Assisting movement of control surface
Answer
100. ‘S’ glass fibres are high temp. strength and are of.
A) Boro silicate
B) Al. Silicate
C) Mag. Alumina silicate
Answer
101. Instrument shock mount absorb.
A) Low frequency high amplitude
B) High frequency low amplitude
C) —
Answer
102. Brush guard is used to protect.
A) Tail rotor
B) Shaft and bearing
C) Main rotor
Answer
103. Semirigid rotor system lateral vibration is caused by.
A) Chordwise balancing
B) Spanwise
C) Both a and b are correct
Answer
104. Braiding comprises.
A) Circular viewing (weaving)
B) Flat viewing
C) Cross viewing
Answer
105. For forward movement of helicopter the control used.
A) Cyclic
B) Collective
C) Both cyclic and collective used
Answer
106. Reason for preferring AC for A/C use is.
A) CBs operate easily
B) SWs operate easily
C) Operation of eqpts not affected by altitude change
Answer
107. Mark the correct statement.
A) High wind is good for helicopter performance
B) Low wind or calm atmosphere is good for helicopter performance
C) No wind is good for hovering
Answer
108. Flare in autorotational descent pilot tilt the disc rearward.
A) Great amount of air checks momentarily the fwd speed and descent
B) Greater amount of air increases Rotor RPM
C) Flare enables pilot to make an emergency landing on a spot with little or no landing roll or skid
Answer
109. Two unlike metal coming in contact with each other may cause.
A) Intergranular corrosion
B) Exfoliation corrosion
C) Electrolytic corrosion
D) Stress corrosion
Answer
110. The difference between IAS and TAS is caused by.
A) Variation of density and temperature at altitude
B) Location of pitot static tube
C) Friction error of the instrument
D) Scale error of instrument
Answer
111. Electrolysis process of producing oxide film on Al. Alloy is known as.
A) Anodizing
B) Alodising
C) Dichromating
D) Sheradising
Answer
112. CBs are used in electrical circuit to.
A) Relieve one circuit from load
B) Operate a system
C) Prevent fire and damage to the system
D) Prevent over or under voltage
Answer
113. The circuit breaker.
A) Must be replaced when pop out
B) Is not safe, as pilot misuses it
C) Is used repeatedly for the same job unlike the fuse
D) Is like a commutator
Answer
114. Mark the correct statement.
A) Pressure error is the difference between IAS and TAS
B) Altimeter is provided with bimetallic device for temperature correction
C) Microbial contamination occurs in gasoline only
D) On condition maintenance concept allow the component to fail in service
Answer
115. Steel is annealed by heating it uniformly.
A) Above critical range and cooling it slowly
B) Above critical range and cooling it in still air
C) In a solution of 50/50 KOH and NaOh
D) Below critical range and cooling it
Answer
116. The swash plate is an essential component for.
A) Cyclic and collective control
B) Collective control only
C) Oscillation in all direction
D) Cyclic control but does not oscillate
Answer
117. Factors responsible for reduction in fatigue life of a component or parts are.
A) Notches, inclusion and fretting corrosion
B) A collar clamped to its shaft and a press fit without planned
C) Tensile and compressive stresses developed by some fabrication process or heat treatment
D) All are correct
Answer
118. To neutralize spilled electrolyte of a nickel cadmium battery we may use.
A) Vinegar or a solution of either boric acid or acetic acid in water
B) Solution of sodium bicarbonate and water
C) Solution of hydroxide solution in water
D) Dilute sulfuric acid
Answer
119. The temperature sensing devices are located within the Ni-cad battery is to.
A) Warn against a faulty cut out of voltage regulator
B) Warn against high battery temperature and prevent overcharging by disconnecting the battery from charging sources
C) Allow cooling air from atmosphere through a regular rate
D) Warn that charging rate is slow
Answer
120. In eddy current testing, when.
A) DC is passed through a coil the magnetic field developed around the coil induced a voltage opposing the flow of original current in the coil
B) AC or DC is passed through a coil, the magnetic field developed around the coil induces a voltage opposing flow of original current in the coil
C) Eddy current induced in to a specimen creates their own field. It reacts the original field opposite to the flow of original current
D) All of the above
Answer
121. For weight and balance of helicopter the weight is directly dependent on the distance from.
A) CP unlike that of a fixed wing aircraft
B) Center of longitudinal axis and the moment is calculated from this point
C) Center of gravity and weight and balance are computed same way as in fixed wing ac
D) Fixed datum of the fuselage and weight and balance are not critical like fixed wing ac
Answer
122. The pay load of an aircraft is.
A) The difference between AUW and the empty weight consisting of crew weight unusable fuel, specified amount of engine and hydraulic oil
B) The difference between AUW and empty weight with seats and full tank of fuel and hydraulic and engine oil
C) Permanently fixed by the manufacturers
D) As in ‘a’ but with seats and not passengers
Answer
123. Unusable qty. of fuel and oil are specified.
A) By the manufacturer
B) By the requirement of CAR
C) Is calculated by their specific gravity
D) Only ‘c’ above is incorrect
Answer
124. Approved repair to the structure of an aircraft are carried out as.
A) Makers manual such as standard practice manual
B) CAIP.(CAA) and approved repair manual AC 43-13a of FAA
C) Repair scheme approved by DGCA
D) All are correct
Answer
125. A/C tires are stored in.
A) A cool, humid and dark room frees from ventilation and dirt
B) A dry, humid and lighted room with good ventilation and free from dirt
C) A warm dry and dark rooms without ventilation and free from dirt
D) A cool, dry and reasonable dark room free from air currents and dirt
Answer
126. The hand fire extinguisher approved for use in a/c cockpit and cabins.
A) Carbon tetrachloride
B) Carbon dioxide
C) Methyl bromide
D) Bromochloro difloro methane
Answer
127. The fire extinguisher container must be hydro-statically tested at every.
A) One year
B) Two year
C) 3 years
D) 6 months
Answer
128. The bonnet assembly of the fire extinguisher sphere contains.
A) A mechanically operated valve which opens a passage for the extinguishing
B) An electrically ignited cartridge which has no operational and storage life
C) An electrically operated cartridge having specified operational and storage life
D) A cartridge to operate a valve to open a passage for extinguishant
Answer
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