PROPELLERS – Air – DGCA Question Bank For Politics

#1. The procedure for un-feathering a propeller is to?

Release the blade latch.

Operate the un-feathering electric pump.

Increases TAS before using the electric un-feathering pump.

Decreases TAS before operating the un-feathering pump.

#2. The purpose of a synchroscope is to?

Indicate the RPM of each engine relative to that of that of the master engine.

Indicate the RPM of each engine.

Indicate the RPM of each propeller.

Indicate the RPM of each propeller relative to that of the master propeller.

#3. What is propeller blade angle?

Between the chord line of the propeller blades and the axis of rotation,

Between the axis of rotation and the plane of rotation.

Between the chord line of the propeller blades and the plane of rotation.

Between the chord line of the blades and the relative airflow.

#4. Propeller blades are twisted in order to?

Ensure constant blade angle along the span.

Ensure constant angle of attack along the span.

Ensure an acceptable angle of attack along the span.

Prevent tip stall due to spanwise airflow.

#5. The RPM lever is used to control the indications on the ...... while the fuel lever is used to control indications on the ......? 1. MAP gauge. 2. Tachometer. 3. ASI. 4. EPR gauge.

1,2.

2,1.

1,3.

2,4.

#6. Variable pitch propellers are?

High efficiency at high speeds.

High efficiency at low speeds.

High efficiency at all speeds.

Optimum efficiency at all speeds.

#7. To feather the propeller the pilot must?

Pull the throttle lever fully back.

Push the throttle lever fully forward.

Pull the RPM lever fully back.

Push the throttle lever fully forward.

#8. The drag on the propeller of a failed engine is?

Greatest when at fine pitch.

Greatest when feathered .

least when at fine pitch.

Greatest when stopped.

#9. The drag on the propeller of a failed engine is?

Greatest when at stopped.

Greatest when running at high RPM.

Least when running at high RPM.

Constant.

#10. If the engine of a light aircraft fails and is allowed to stop in flight?

It must be feathered.

It cannot be feathered.

No advantage will be gained by feathering it.

Glide range will be less if it is feathered.

#11. What is the most common reason for increasing the number of blades on a propeller?

increase aerodynamic efficiency.

Reduce propeller noise.

Increase power absorption capability.

Increase the effectiveness of the constant speed unit,

#12. Which of the following will increase the gyroscopic precession effect of a propeller?

Increased angle of attack.

Decreased TAS.

Pitch and roll.

Increased RPM.

#13. A constant speed propeller aircraft is descending with the throttle closed and RPM lever set at 2000 RPM. What would be the effect of retarding the propeller lever?

Rate of descent would remain constant and RPM would increase.

Rate of descent would remain constant and RPM would decrease.

Rate of descent and RPM would increase.

Rate of descent and RPM would decrease.

#14. Which of the following conditions will occur when a propeller is feathered?

The highest windmilling speed.

The maximum D:L ratio.

Minimum aerodynamic drag on the propeller.

Lowest blade angle.

#15. Which of the following statement about propellers is true?

Angle of attack is the angle between the chord line of the blade and the relative airflow.

Critical tip speed is the RPM at which there is a risk of some part of the blade stalling.

Effective pitch is the distance that a propeller would move forward in one turn if there were no slip.

Blade angle is between the chord line of the blade and the shaft axis.

#16. Which is propeller blade angle?

The angle between the chord line of the blades and the axis of the propeller shaft.

The angle between the chord line of the blades and plane of rotation of the propeller.

The angle between the chord line of the blades and total reaction.

The angle between the chord line of the blades and the free stream airflow.

#17. Why is it necessary to vary blade angle from root to tip?

To prevent shock waves from forming at the tips.

To prevent shock waves from forming at the roots.

To ensure that angle of attack is acceptable over the whole blade.

To ensure that most thrust is produced at the tips.

#18. Which of the following is true of a constant speed propeller?

RPM decreases with decreasing TAS.

RPM increases with increasing TAS.

Blade angle increases with increasing TAS.

Blade angle decreases with increasing TAS.

#19. Which of the following will increase the angle of attack of a fixed pitch propeller?

Decrease TAS and RPM.

Increase TAS and RPM.

Increase RPM and decrease TAS.

Decrease RPM and increase TAS.

#20. Which if the following will increase the angle of attack of a fixed pitch propeller?

Pull up into a climb without increasing power.

Push down into a dive without decreasing power.

Decrease RPM while descending.

Decrease RPM while climbing.

#21. How does drag on a windmilling propeller compare with that on a stationary one?

Lower.

Higher.

Lower or higher depending on TAS.

Lower or higher depending on blade angle.

#22. If propeller pitch is decreased in a glide, rate of descent and L:D ratio will?

Decrease, Decrease.

Increase, Increase.

Decrease, Increase.

Increase, Decrease.

#23. Propeller efficiency is ?

SHP/THP.

THP/SHP.

SHP/BHP.

BHP/THP.

#24. Propeller efficiency is?

THP/BHP.

THP/FHP.

SHP/BHP.

BHP/THP.

#25. Increasing propeller RPM setting in glide will............range and ..........L:D ratio.

Increase, increase.

Decrease, Decrease.

Increase, Decrease.

Decrease, Increase.

#26. For a fixed pitch propeller?

Blade angle increases with increasing RPM.

Angle of attack increases with increasing RPM.

Blade angle decreases with increasing RPM.

Angle of attack decreases with increasing RPM.

#27. For a constant speed propeller?

Blade angle increases with increasing RPM.

Angle of attack increases with increasing RPM.

Blade angle decreases with increasing RPM.

Angle of attack decreases with increasing RPM.

#28. For a constant speed propeller?

Blade angle increases while increasing TAS.

Angle of attack increases with increasing TAS.

Blade angle decreases with increasing TAS.

Angle of attack decreases with increasing TAS.

#29. f the propeller RPM lever is pushed forward in a glide it will?

Increase range.

Increase drag.

Decrease RPM.

Improve cooling.

#30. If propeller pitch is increased in a glide?

RPM and range will increase.

RPM and range will decrease.

RPM will decrease and range will increase.

RPM will increase and range will decrease.

#31. A constant speed propeller...............compared to a fixed pitch propeller?

Is lighter.

Is more efficient.

Is stronger.

Turns faster.

#32. Propeller blade twist?

Reduces blade angle from root to tip.

Increases blade angle from root to tip.

Is constant from root to tip.

Varies with RPM selection.

#33. In reverse thrust?

Angle of attack is greatest at the blade tips.

Angle of attack is greatest at the blade roots.

Angle of attack is greatest at the 70% radius point.

Angle of attack is zero.

#34. As TAS increases at constant altitude the blade angle and angle of attack of a variable constant speed propeller?

Increases increses.

Decreases Decreases.

Remains constant Decreases.

Increases Remains constant.

#35. If the throttle angle is increased at constant altitude, the blade angle and thrust of a constant speed propeller will ?

Increase increase.

Decrease Decrease.

Remains constant Increase.

Increases or decreases depending on airspeed.

#36. Moving the lever from A to B?

Increases RPM.

Decreases RPM.

Increases blade angle.

Decreases power.

#37. For take-off using a constant speed propeller the RPM, power and mixture levers must be?

Forward Forward Forward.

Aft Aft Aft.

Forward Forward Aft.

Aft Forward Forward.

#38. . The propeller beta range is?

From ground fine to flight fine and used on the ground.

From reverse to coarse and used in the air.

The manual pitch control range.

The automatic pitch control range.

#39. Unfeathering is achieved by?

Centrifugal force.

Stored pressure or a dedicated pump.

An electric motor.

Aerodynamic turning moment.

#40. Propeller centrifugal turning moment?

Opposes aerodynamic turning moment.

Assists aerodynamic turning moment.

Drives the blades to coarse pitch.

Opposes aerodynamic turning moment when not windmilling.

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