DGCA Module 17 Propeller 4th Session of 2025 exam is focused on propeller assembly, feathering, blade pitch control and definitions. Also propeller synchronizing, governing mechanisms inspection and maintenance practices for safe and efficient operation.
DGCA Module 17
4th Session of 2025
1. Non-rotating assembly is.
A) Dome assembly
B) Control assembly
C) Both
Answer
2. Purpose of greasing.
A) Lubrication only
B) Cooling only
C) Protection from corrosion
Answer
3. Blade angle checking is done by.
A) Vernier caliper
B) Universal protractor
C) Spirit level
Answer
4. Angle of attack.
A) AOA is the angle between thrust line and airflow
B) AOA is the angle between chord and the relative airflow
C) AOA is the angle between blade face and plane of rotation
Answer
5. In variable pitch propeller, storage upto more than 3 months then the mechanism should be.
A) Left dry
B) Washed with kerosene.
C) Flushed with inhibiting oil
Answer
6. In tracking the like position, tolerance is defined by.
A) DGCA
B) Aircraft manufacturer
C) Propeller manufacturer
Answer
7. In electrical de-icing system power is transmitted through.
A) Wires only
B) Slip rings only
C) Brushes and slip rings
Answer
8. In one engine synchronization system special governor is mounted on.
A) Right side
B) Engine front side
C) Left side
Answer
9. Due to ice formation causes.
A) Increase in propeller efficiency
B) No effect on propeller
C) Loss of propeller efficiency
Answer
10. Storage of propellers indefinite → at least.
A) 10 minutes in a month
B) 15 minutes in a month
C) 30 minutes in a month
Answer
11. Blade tracking is the process of tracking relative.
A) Length of blade
B) Weight of blade
C) Position of blade
Answer
12. Definition of pitch distribution.
A) Change of blade thickness from root to tip
B) Change of blade angle from root to tip
C) Change of blade width from root to tip
Answer
13. Aluminium alloy propeller is cleaned by.
A) Water only
B) Acid solution
C) Suitable solvent
Answer
14. Definition of blade angle.
A) Blade angle is the angle between the face of blade and the plane of rotation
B) Blade angle is the angle between the chord of the blade section and the plane in which propeller rotates
C) Blade angle is the angle between blade tip and hub
Answer
15. The chord line is.
A) An imaginary line drawn through the blade from the leading edge to the trailing edge
B) A real line marked on the blade surface
C) A curved line on the blade face
Answer
16. The blade face is subjected to.
A) Only centrifugal force
B) Only thrust bending force
C) Tension from centrifugal force and additional tension from thrust bending force
Answer
17. MTCS of wooden propellers are stored.
A) Horizontally only
B) At any angle
C) Vertically only
Answer
18. Metal tipping of wooden propeller is made of.
A) Aluminium
B) Nickel or brass
C) Steel
Answer
19. Advantage of feathering propeller.
A) To increase thrust during take-off
B) To minimize drag in engine off condition
C) To increase RPM
Answer
20. Engine driven propeller governor receives oil from.
A) Separate oil tank
B) Hydraulic pump
C) Engine lubrication system
Answer
21. Purpose of cyclic timer.
A) To energise the heating element
B) To control propeller RPM
C) To regulate oil pressure
Answer
22. In electrical de-icing system, the protective device is.
A) Circuit breaker
B) Fuse
C) Current limiter
Answer
23. MTCS about fluid transfer in anti-icing.
A) Fluid is transferred by gravity
B) Fluid is transferred under pressure centrifugal force through spray nozzles to each blade shank
C) Fluid is transferred by suction
Answer
24. Synchronization is done during.
A) ON in flight and OFF at take-off
B) ON at take-off only
C) ON in flight and OFF at take-off. (both options correct in exam context)
Answer
25. Turboprop assembly – major sub-assemblies are.
A) Barrel, pitch lock assembly, low pitch lock assembly and dome assembly
B) Compressor, turbine and nozzle
C) Gearbox and propeller shaft only
Answer
26. Pilot can manually synchronize the propeller when.
A) Automatic synchronization is fitted
B) Synchronization is not fitted
C) During take-off only
Answer
27. During take-off maximum thrust is required, then constant speed propeller is at.
A) High blade angle or pitch
B) Medium blade angle
C) Low blade angle or pitch. The low blade angle keeps the AOA small
Answer
28. Apparent engine roughness is often a result of propeller unbalance. The effect of an unbalanced propeller will usually be.
A) Greater at low RPM
B) Same at all RPM
C) Greater at high RPM
Answer
29. The governor controlled constant speed propeller.
A) Changes the blade angle manually to control RPM
B) Changes the blade angle automatically, keeping engine RPM constant
C) Changes engine power to control RPM
Answer
30. When high speed occurs in the governor.
A) The flyweights move inward
B) The flyweights remain stationary
C) The flyweights tilt outward
Answer
31. Maximum efficiency of a propeller is derived by.
A) Hub speed
B) Tip speed
C) Maintaining constant RPM
Answer
32. The gear ratio of the reduction gear of a propeller assembly. The correct option is related to.
A) Spur gear planetary – ratio depends on teeth of drive gear and driven gear
B) Bevel gear planetary – ratio depends on teeth of ring driven gear and ring driving gear
D) Both
Answer
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