Results
Q1. The blade angle of a propeller is the angle between:
Correct answer is – the propeller chord and the plane of rotation of the propeller
Q2. The blade angle:
Correct answer is – decreases from root to tip
Q3. The geometric pitch of a propeller is:
Correct answer is – the distance it would move forward in one revolution at the blade angle
Q4. A right hand propeller:
Correct answer is – rotates in a clockwise direction when viewed from the rear
Q5. The angle of attack of a fixed pitch propeller:
Correct answer is – depends on forward speed and engine rotational speed
Q6. During the take-off run a fixed pitch propeller is:
Correct answer is – at too coarse an angle for maximum efficiency
Q7. For an aircraft with a fixed pitch propeller, an increase in rev/min during the take-off run at full throttle is due to:
Correct answer is – the propeller angle of attack increasing
Q8. An aircraft with a fixed pitch propeller goes into a climb with reduced IAS and increased $rev/min$ The propeller:
Correct answer is – angle of attack will increase
Q9. For an aircraft with a fixed pitch propeller, propeller efficiency will be:
Correct answer is – low at both low and high speed, and highest at cruising speed
Q10. The blade angle of a fixed pitch propeller would be set to give the optimum angle:
Correct answer is – during the cruise
Q11. Propeller torque results from the forces on the propeller:
Correct answer is – caused by the airflow, giving a moment around the aircraft’s longitudinal axis
Q12. The thrust force of a propeller producing forward thrust:
Correct answer is – tends to bend the propeller tips forward
Q13. A propeller which is windmilling:
Correct answer is – rotates the engine in the normal direction and gives drag
Q14. For an aircraft with a right hand propeller the effect of slipstream rotation acting on the fin will cause: (see Chapter 16, Book 13 Principles of Flight).
Correct answer is – yaw to the left
Q15. To counteract the effect of slipstream rotation on a single engine aircraft:
Correct answer is – the fin may be off-set
Q16. The gyroscopic effect of a right hand propeller will give: (see Chapter 16, Book 13 Principles of Flight)
Correct answer is – a yaw to the right when the aircraft pitches nose up
Q17. The alpha range of a variable pitch propeller is between:
Correct answer is – feather and flight fine pitch stop
Q18. When the CSU is running “on speed”:
Correct answer is – the governor weight centrifugal force balances the CSU spring force
Q19. If the engine power is increased with the propeller lever set then:
Correct answer is – the governor weights move out, blade angle increases, rpm decreases, weights move in
Q20. The purpose of the centrifugal feathering latch on a single acting propeller is to prevent:
Correct answer is – the propeller from feathering on shutdown
Q21. A hydraulic accumulator may be fitted to a single acting propeller to provide pressure for:
Correct answer is – unfettering the propeller
Q22. If it is required to increase the rpm of a variable pitch propeller without moving the power lever, the propeller lever must be moved:
Correct answer is – forwards, the governor weights move inwards, blade angle decreases
Q23. The CSU incorporates an oil pump. Its purpose is:
Correct answer is – to increase the engine oil pressure to a higher pressure to operate the propeller pitch change mechanism
Q24. A propeller blade is twisted along its length:
Correct answer is – to maintain a constant angle of attack from root to tip of the blade
Q25. Propeller torque is:
Correct answer is – the turning moment produced by the propeller about the axis of the crankshaft
Q26. The greatest stress on a rotating propeller occurs:
Correct answer is – at the root
Q27. The Beta range of a propeller is from:
Correct answer is – the flight fine pitch stop to the reverse pitch stop
Q28. An ‘auto-feathering’ system senses:
Correct answer is – low torque
Q29. What happens to the pitch of a variable pitch propeller in order to maintain constant rpm when (i) IAS is increased and (ii) Power is increased?
Correct answer is – (i) increases (ii) increases
Q30. Propellers may have an ‘avoid’ range of rpm:
Correct answer is – to avoid resonance peaks which could lead to fatigue damage to the propeller
