DGCA Module 17 Propeller, 1st Session of 2017 covered propeller fundamentals, types, blade pitch control, feathering systems, synchronizing, inspection and mixed type questions.
DGCA Module 17
1st Session of 2017
1. The force that tends to pull the propeller blades out of the hub.
A) Centrifugal Force
B) C.T.F
C) A.T.F
Answer
2. The purpose of drain hole in wooden propeller tipping.
A) To drain out the engine oil stuck in piston by centrifugal force
B) To drain away moisture by centrifugal action
C) To drain away anti-ice fluid by centrifugal force
Answer
3. What component allows oil to pass from the stationary engine to the rotating propeller hub.
A) Oil transfer sleeve
B) Pilot valve
C) Pitch change actuator
Answer
4. In de-icing system, electrical power is transferred through.
A) Slip rings
B) Brush
C) Slip rings and Brush
Answer
5. Electrical de-icing systems are usually designed for.
A) Continuous application
B) Intermittent application
C) None
Answer
6. Blade tracking is carried out in propeller to determine.
A) Actual position of propeller blades
B) Relative position of propeller blades
C) As in (B) and out-of-track propeller as easy to dynamically balance
D) ATA
Answer
7. When aircraft comes back from flight, ground servicing of propeller.
A) Blade angle increases to negative pitch to reduce drag
B) Blade angle decreases to negative pitch to reduce drag
C) Blade angle neither decreases nor increases to reduce drag
Answer
8. Purpose of metal tipping in L.E. of wooden propeller is to.
A) Prevent formation of ice and snow
B) Protect blade from FOD caused by flying objects and erosion
C) Reduce drag and increase efficiency
Answer
9. MTCS – Ground adjustable propellers.
A) Adjust blade angle only on ground
B) Adjust blade angle only in flight
C) Adjust blade angle in both ground and flight
Answer
10. The purpose of reverse pitch in propellers is.
A) Blade angle is changed to reverse pitch to provide negative thrust
B) Blade angle is changed to forward pitch to provide positive thrust
C) Blade angle is not changed at all
Answer
11. In propeller governor, the purpose of pilot valve.
A) To control the propeller RPM
B) To control the engine RPM
C) To control both engine and propeller RPM
Answer
12. In feathering, the source of hydraulic pressure is from.
A) Dedicated propeller hydraulic system
B) Aircraft hydraulic system
C) Engine lubrication system
Answer
13. During feathering of propellers, what happens.
A) Hydraulic pressure moves blades toward low pitch
B) Hydraulic pressure moves blades toward high pitch
C) Hydraulic pressure moves blades toward reverse pitch
Answer
14. When it is difficult to determine the probable cause of engine vibration.
A) Propeller hub appears to swing in slight orbit
B) Propeller tips appear to swing in slight orbit
C) None of the above
Answer
15. Bearing storage up to twelve months.
A) Bearing must be removed and examined for fretting and corrosion
B) If it is found satisfactory, it must be assembled on the blade
C) Both (A) & (B)
Answer
16. The primary function of front and rear cones when splined propeller shaft.
A) To center the propeller on the crankshaft
B) To prevent the propeller from loosening
C) To transmit engine torque to the propeller
Answer
17. When flyweights overcome the speeder spring pressure, it means.
A) Propeller is rotating underspeed
B) Propeller is rotating overspeed
C) Engine is in underspeed
Answer
18. Auto feathering accomplishes.
A) Set automatically
B) Manually by pilot
C) Both automatically and manually
Answer
19. When speeder spring force decreases, the blade angle will be.
A) Increase
B) Decrease
C) Remain same
D) None
Answer
20. If a propeller settles in underspeed condition, the blade angle will be.
A) Fine pitch
B) Coarse pitch
C) Smooth pitch
D) Retarded pitch
Answer
21. Hygroscopic coating on propeller while storing.
A) It makes a layer between blade and atmosphere
B) It cannot absorb moisture
C) It absorbs moisture
D) Both (A) and (C)
Answer
22. Phosphate is used as anti-icing fluid in place of isopropyl alcohol due to.
A) Expensive
B) Flammability
C) Corrosive
D) All
Answer
23. Static balancing is done by.
A) Suspension test stand
B) Knife edge test stand
C) No stand is require
Answer
24. Storage of propellers should be.
A) On tip suspension
B) Not on tip
C) Dip in oil
Answer
25. Nicks and abrasions are.
A) Permissible
B) Not permissible
C) Allowed only during testing
Answer
26. Hydromatic propellers are.
A) Feathering propellers
B) Non-feathering propellers
C) Fixed pitch propellers
Answer
27. Material of propellers.
A) Duralumin
B) Anodized Aluminium
C) Anodized Magnesium
D) All
Answer
28. During preservation, the propeller should be checked for.
A) Moisture & Sunlight
B) Physical damage & Corrosion
C) Internal damage
D) Both (A) & (B)
Answer
29. Static unbalance is due to.
A) When CG of the propeller doesn’t coincide with the axis of rotation
B) When CG of the propeller or similar elements don’t follow in the same plane
C) When CG of the propeller coincides with the axis of rotation
Answer
30. Anti-icing is done.
A) On ground
B) As in (A), for some time period
C) In flight at high altitude
D) All
Answer
31. Hydromatic propeller lubrication.
A) Uses special oil
B) With its own engine oil under RPM
C) Not received lubrication
Answer
32. Slip is.
A) Geometric pitch – Effective pitch
B) Effective pitch – Geometric pitch
C) Geometric pitch + Effective pitch
Answer
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