Propellers MCQ 01 - A

© Air Service Training (Engineering) Ltd

Module 17 B1/021 Propellers 01 - A

1. The Torquemeter Transmitter is usually fitted:

a In the reduction gear housing

b On the manifold

c In the CSU

2. The pitch angle of the propeller blade is:

a The angle between the blade cord line and plane of rotation

b Its angle of attack with the airflow only at cruise

c The angle between the blade cord line and the helix angle

3. The distance a propeller blade moves forward in one revolution when it is giving no thrust is known as:

a Experimental mean pitch

b Geometric mean pitch

c The slip

4. A propeller angle of attack:

a Is greatest at faster speeds

b Remains the same

c Varies with forward speed

5. The thrust force in flight causes the propeller blades:

a To bend forward in the direction of flight

b To oppose the centrifugal force, keeping then straight

c To bend backwards to the direction of flight

6. The fly weights in a propeller control unit primarily:

a Regulate the operating pressure

b Actuate a relief valve

c Actuate a pilot valve

7. With a double action propeller, the ‘ON’ speed position is when:

a Oil is flowing to the front of the piston

b Oil is trapped in the front and rear of the piston

c Oil is flowing to the rear of the piston

8. The purpose of the oil booster oil pump as part of the governor in a CSU is:

a To provide enough oil to force the propeller blades into coarse pitch

b To actuate the feathering mechanism and fine pitch stop as required

c Not required as the CSU only uses engine oil pressure

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9. In a double acting variable pitch propeller, the feathering pump:

a Supplies oil pressure to move the propeller only out of the feathered position

b Opens a pilot valve in the CSU to allow the propeller to go to fully feather

c Supplies oil pressure to drive the propeller into and out of feather

10. Stone damage to a propeller blade would affect:

a The maximum RPM it would achieve

b Its aerodynamic performance

c Its structural integrity

11. When a propeller is said to have torque it means:

a The turning moment produced by a propeller about the axis of rotation

b The path through which the propeller blades travel in one revolution

c The comparison between the varying angles of attack of the propeller blades

12. Some propellers are fitted with accumulators for the purpose of:

a Un-feathering the propeller

b Providing standby fine pitch control

c Feathering the propeller blades

13. To obtain the very high power required at the commencement of the take-off run, the propeller is at:

a The coarsest pitch position possible below feather, to provide maximum speed

b The coarsest pitch position possible below the feather stop to allow the maximum RPM

c A fine pitch position, to allow the engine to attain maximum RPM

14. If engine RPM is to remain constant on an engine fitted with a variable pitch propeller, an increase in engine power requires:

a A decrease in blade angle

b An increase in blade angle

c A constant angle of attack

15. When RPM increases above the value for which a governor is set, the pitch change mechanism turns the blades:

a To a higher angle, so increasing the load on the engine

b To a lower angle, so increasing the counter weight reaction

c With the help of centrifugal twisting moments, to increase the load on the engine

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16. When the selected RPM has been attained, the forces in the CSU are balanced. They are centrifugal force and:

a Inertia force

b Oil pressure

c Spring force

17. The function of a variable pitch propeller is to:

a Obtain the highest take-off weight for the minimum power

b Obtain the best fuel consumption for varying conditions

c Reduce the noise and vibration from the propeller blades

18. The centrifugal twisting moment is the tendency of the:

a Blade to turn towards the coarse pitch position when rotating

b Aircraft to rotate in the opposite direction to the propeller

c Blade to turn towards the fine pitch position when rotating

19. A double acting variable pitch propeller is one in which the pitch is increased:

a And decreased by oil pressure

b By spring pressure and decreased by oil pressure

c And decreased by spring pressure

20. With the CSU in the Under-speed condition, oil will be directed to:

a Increase the blade angle

b Decrease the blade angle

c Decrease the engine RPM

21. An automatic feathering system could be actuated by:

a The engine pressure ratio

b The torquemeter system

c The water injection system

22. The centrifugal feathering stop will prevent the propeller:

a Feathering during normal operation

b Feathering after engine shut-down

c From moving out of feather

23. When the engine is running, the CSU is continually sensing:

a Propeller blade angle

b Engine RPM

c Engine manifold pressure

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24. The normal tendency of a propeller blade when it is rotating is to go into:

a Coarse pitch if not equipped with counter weights

b Fine pitch if not equipped with counter weights

c Fine pitch if equipped with counter weights

25. The most common method by which the propeller is exercised is to:

a Move pitch control from reverse to fully feathered twice and check the RPM returns to the same when fully fine

b Move pitch control from fully fine to fully coarse at least twice and check RPM is the same when fully fine

c Set pitch control to mid-position and move throttle through full range twice and check RPM remains constant

26. For take-off, the propeller control lever should be:

a Fully back

b Fully forward

c Mid-position

27. When propeller blades move from reverse pitch to flight normal, they move through:

a Coarse pitch

b Fine pitch

c Feathered pitch

28. To feather a double acting propeller the oil is supplied by:

a The engine oil system

b An auxiliary electrical driven oil pump

c The constant speed unit booster oil pump

29. A

a

b

c

30.

a

b

c

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Last printed 16/11/2006 08:37:00 AM

Propellers MCQ 01 - A

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