PROPELLERS – Air – DGCA Question Bank For Politics

#1. 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.

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

lncreased angle of attack.

Decreased TAS.

Pitch and roll.

lncreased RPM

#3. A constant speed propeller aircraft is descending with the throttle closed and KPM 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.

#4. What effect does the torque reaction of a single right handed tractor propeller have during the take-off roll?

Weight on the right wheel increases while that on the left decreases.

Weight on the right wheel decreases while that on the left increases.

Weight on the right and left wheels decreases.

Weight on the right and left wheels increases.

#5. What would be the result of propeller slipstream effect when taking-off using a single right handed tractor propeller?

Pitch up.

Pitch down

Yaw to the right.

Yaw to the left.

#6. Which of the following statements about propellersis true?

Angle of attack is the angle between the chord line of the blade and the plane of rotation.

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

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

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

#7. 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.

#8. Which of the following statements 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 the angle between the chord line of the blade and the shaft axis.

#9. What is the critical tip speed of a propeller?

The RPM at which the angle of attack at the blade tip is equal to the stalling angle of the blades.

Critical tip speed is the lowest combination of RPM and inflow speed at which the airflow over the tips of the blades first reaches the local speed of sound.

The speed at which the blade tips experience low speed stall.

The speed at which the blade tip angle is the equal to the staUing angle cf the blades.

#10. What 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 the plane of rotation of the propeller.

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

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

#11. 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.

#12. 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.

#13. 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.

#14. Which of 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.

#15. How do propellers convert engine horsepower into thrust horsepower?

By using aerodynamic processes to generate forward facing lift which is thrust.

By using aerodynamic means to generate lift, the forward facing component of which is thrust.

By producing a low pressure area in front of the propeller disk which causes the aircraft to be sucked forward.

By using aerodynamic means to generate a forward facing total reaction which is thrust.

#16. Which of the following produces best propeller efficiency?

Ensuring that the propeller wash has maximum velocity.

Ensuring that the propeller was11 velocity is less than TAS.

Ensuring that the propeller affects the minimum practicable mass flow of air.

Ensuring that the velocity of the propeller wash is just higher than TAS.

#17. An aircraft with a fixed pitch propeller is in straight and level flight. What will happen if air density suddenly increases, assuming that engine power output is not immediately affected?

The propeller RPM will decrease.

The propeller RPM will increase.

The propeller blade angle will increase.

The propeller blade angle will decrease.

#18. 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.

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

Decrease, Decrease.

Increase, Increase.

Decrease, Increase.

Increase, Decrease.

#20. Propeller efficiency is?

SHP/THP.

THP/SHP.

SHP/BHP.

BHP/THP.

#21. Propeller efficiency is?

THP/BHP.

THP/FHP.

SHP/BHP.

BHP/THP.

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

Increase, Increase.

Decrease, Decrease.

Increase, Decrease.

Decrease, Increase.

#23. During take-off using a right handed tractor propeller, torque reaction will cause?

Right roll.

Left roll.

Right roll and yaw.

Left roll and yaw.

#24. During the take-off run using a right handed tractor propeller, the torque reaction will cause?

Increased load on right wheel and decreased on left wheel.

Decreased load on right wheel and increased on left.

Right roll and left yaw.

Left roll and right yaw.

#25. During take-off using a right handed tractor propeller, the slipstream effect will cause?

Right roll and left yaw

Left roll and right yaw.

Right roll and yaw.

Left roll and yaw.

#26. During take-off using a tail wheel and right handed tractor propeller, the asymmetric blade effect will cause?

Right roll.

Left roll.

Right yaw.

Left yaw.

#27. During take-off using a nose wheel and right handed tractor propeller the asymmetric thrust effect will cause?

Right roll.

Left roll.

Right yaw.

Left yaw.

#28. During take-off using a tail wheel and right handed tractor propeller, gyroscopic precession will cause?

Right roll.

Left roll.

Right yaw.

Left yaw.

#29. During take-off using a nose wheel and right handed tractor propeller, the gyroscopic precession effect will cause?

Right roll.

Left roll.

Right yaw.

Left yaw.

#30. In an aircraft with twin right handed tractor propellers, the critical engine will be?

The one which fails.

Right.

Left.

Right or left depending on stage of flight.

#31. Propeller gyroscopic precession is altered by?

RPM change.

Right yaw and left roll.

Left yaw and right roll.

Pitch and roll.

#32. Propeller gyroscopic precession force is induced by?

RPM change.

Right yaw and left roll.

Left yaw and right roll.

Pitch and yaw.

#33. Geometric pitch is?

Blade angle minus angle of attack.

Blade angle plus angle of attack.

The distance moved forward through the air in one revolution, if angle of attack was zero.

The distance moved forward in one revolution.

#34. Helix angle is?

Blade angle minus angle of attack.

Blade angle plus angle of attack.

The distance moved forward through the air in one revolution.

The distance moved forward in one revolution.

#35. Blade angle is?

Helix angle minus angle of attack.

Helix angle plus angle of attack.

The distance moved forward through the air in one revolution.

The distance moved forward in one revolution.

#36. A feathered propeller produces?

Minimum drag.

Maximum drag.

Maximum RPM.

Minimum glide speed.

#37. For a fixed pitch propeller?

Blade angle increases with increasing TAS.

Angle of attack increases with increasing TAS.

Blade angle decreases with increasing RPM.

Angle of attack decreases with increasing TAS.

#38. 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

#39. For a constant speed propeller?

Blade angle increases with increasing RPM.

Angle of attack increases with increasing RPM.

Blade angle decreases wim increasing RPM.

Angle of attack decreases with increasing FWM.

#40. For a constant speed propeller?

Blade angle increases with increasing TAS.

Angle of attack increases with increasing TAS.

Blade angle decreases with increasing TAS.

Angle of attack decreases with increasing TAS.

#41. A coarse blade angle is .......... compared to a fine pitch angle?

More efficient at low TAS.

More efficient at high TAS.

More efficient at low RPM

Less efficient at high FWM.

#42. Increasing power in a single right handed tractor propeller aircraft in the stall will?

Make left wing drop worse.

Make right wing drop worse.

Not affect wing drop.

Increase stalling speed.

#43. Increasing the number of propeller blades will?

Increase power absorption.

Improve efficiency.

Reduce propeller torque.

Reduce noise.

#44. Increasing propeller blade length will?

Decrease power absorption.

Increases efficiency.

Reduce torque reaction.

Reduce tip speeds.

#45. If the propeller RPM lever is pushed forward in a glide it will?

Increase range.

Increase drag.

Decrease RPM.

Improve cooling.

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

RPM and range will increase.

RPlM and range will decrease.

RPM will decrease and range will increase.

RPM will increases and range will decrease.

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

Is lighter.

Is more efficient.

Is stronger.

Turns faster.

#48. Maximum propulsive efficiency of a coarse pitch propeller is ....... compared to a fine pitch propeller.

Higher.

Lower.

Identical.

Higher or lower depending on RPM.

#49. Propeller propulsive efficiency?

Increases with increasing blade pitch.

Increases with increasing RPM.

Decreases with number of blades.

Decreases with increasing blade pitch.

#50. 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.

#51. Centrifugal twisting moment?

Assists in unfeathering.

Always opposes aerodynamic turning moment.

Assists aerodynamic turning moment when in reverse thrust.

Assists aerodynamic turning moment when windmilling.

#52. 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.

#53. Propeller torque?

Always opposes engine torque.

Never opposes engine torque.

Never assists engine torque.

Assists engine torque in windmilling flight.

#54. Angle of attack is?

Lowest at the tips.

Lowest at the roots.

Lowest at the 70% radius.

Uniform at all points along the blade.

#55. In a constant IAS climb, a constant speed propeller will?

Decrease blade angle.

Increase blade angle.

Maintain constant blade angle.

Maintain constant angle of attack.

#56. In a constant TAS climb, a constant speed propeller will?

Decrease blade angle.

Increase blade angle.

Maintain constant blade angle.

Maintain constant angle of attack.

#57. If TAS increases at constant altitude, a constant speed propeller will?

Decrease blade angle.

Increase blade speed.

Maintain constant blade angle.

Maintain constant angle of attack.

#58. If density decreases at constant TAS, a constant speed propeller will?

Decrease blade angle.

Increase blade angle.

Maintain constant blade angle.

Maintain constant angle of attack.

#59. Left yaw of a propeller aircraft at VR might be caused by?

Gyroscopic precession of a single right handed tractor propeller.

Gyroscopic precession of a single left handed tractor propeller.

Asymmetric blade effect of a single left handed tractor propeller.

Asymmetric blade effect of a contra rotating propeller system.

#60. Right yaw of a propeller aircraft at VR might be caused by?

Gyroscopic precession of a single right handed tractor propeller.

Gyroscopic precession of a single left handed tractor propeller.

Asymmetric blade effect of a single right handed tractor propeller.

Asymmetric blade effect of a contra rotating propeller system.

#61. Right roll of a propeller aircraft at lift-off might be caused by?

Weathercock effect of a single right handed tractor propeller.

Weathercock effect of a single left handed tractor propeller.

Asymmetric blade effect of a single right handed tractor propeller.

Asymmetric blade effect of a contra rotating propeller system.

#62. Left yaw and roll of a propeller aircraft in climb out might be caused by?

Gyroscopic precession of a single right handed tractor propeller.

Gyroscopic precession of a single left handed tractor propeller.

Asymmetric blade effect of a single right handed tractor propeller.

Asynlmetric blade effect of a contra rotating propeller system.

#63. Right roll and yaw of a propeller aircraft in climb out might be caused by?

Gyroscopic precession of a single right handed tractor propeller.

Right engine failure.

Asymmetric blade effect of a single right handed tractor propeller.

Left engine failure.

#64. Right yaw and roll of a propeller aircraft in climb out might be caused by?

Gyroscopic precession of a single right handed tractor propeller.

Asymmetric blade effect of a single left handed tractor propeller.

Asymmetric blade effect of a single right handed tractor propeller.

Left engine failure.

#65. Right yaw of a propeller aircraft at speeds approaching VR might be caused by?

Gyroscopic precession of a single right handed tractor propeller.

Asymmetric blade effect of a single right handed tractor propeller.

Asymmetric blade effect of a single left handed tractor propeller.

Asymmetric blade effect of a twin engine contra rotating propeller system.

#66. Sudden right yaw and roll of a propeller aircraft at speeds above VR might be caused by?

Left engine failure.

Right engine failure.

Asymmetric blade effect of a single left handed tractor propeller.

Torque reaction in a twin engine contra rotating propeller system.

#67. Centrifugal twisting moment?

Tends to drive the blades to coarse pitch.

Tends to drive the blades to fine pitch.

Tends to tear off the blades.

Tends to sweep back the blades.

Dgca Question Bank For Pilots

Results

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

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

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

#4. What effect does the torque reaction of a single right handed tractor propeller have during the take-off roll?

#5. What would be the result of propeller slipstream effect when taking-off using a single right handed tractor propeller?

#6. Which of the following statements about propellersis true?

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

#8. Which of the following statements about propellers is true?

#9. What is the critical tip speed of a propeller?

#10. What is propeller blade angle?

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

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

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

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

#15. How do propellers convert engine horsepower into thrust horsepower?

#16. Which of the following produces best propeller efficiency?

#17. An aircraft with a fixed pitch propeller is in straight and level flight. What will happen if air density suddenly increases, assuming that engine power output is not immediately affected?

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

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

#20. Propeller efficiency is?

#21. Propeller efficiency is?

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

#23. During take-off using a right handed tractor propeller, torque reaction will cause?

#24. During the take-off run using a right handed tractor propeller, the torque reaction will cause?

#25. During take-off using a right handed tractor propeller, the slipstream effect will cause?

#26. During take-off using a tail wheel and right handed tractor propeller, the asymmetric blade effect will cause?

#27. During take-off using a nose wheel and right handed tractor propeller the asymmetric thrust effect will cause?

#28. During take-off using a tail wheel and right handed tractor propeller, gyroscopic precession will cause?

#29. During take-off using a nose wheel and right handed tractor propeller, the gyroscopic precession effect will cause?

#30. In an aircraft with twin right handed tractor propellers, the critical engine will be?

#31. Propeller gyroscopic precession is altered by?

#32. Propeller gyroscopic precession force is induced by?

#33. Geometric pitch is?

#34. Helix angle is?

#35. Blade angle is?

#36. A feathered propeller produces?

#37. For a fixed pitch propeller?

#38. For a fixed pitch propeller?

#39. For a constant speed propeller?

#40. For a constant speed propeller?

#41. A coarse blade angle is .......... compared to a fine pitch angle?

#42. Increasing power in a single right handed tractor propeller aircraft in the stall will?

#43. Increasing the number of propeller blades will?

#44. Increasing propeller blade length will?

#45. If the propeller RPM lever is pushed forward in a glide it will?

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

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

#48. Maximum propulsive efficiency of a coarse pitch propeller is ....... compared to a fine pitch propeller.

#49. Propeller propulsive efficiency?

#50. Propeller blade twist?

#51. Centrifugal twisting moment?

#52. In reverse thrust?

#53. Propeller torque?

#54. Angle of attack is?

#55. In a constant IAS climb, a constant speed propeller will?

#56. In a constant TAS climb, a constant speed propeller will?

#57. If TAS increases at constant altitude, a constant speed propeller will?

#58. If density decreases at constant TAS, a constant speed propeller will?

#59. Left yaw of a propeller aircraft at VR might be caused by?

#60. Right yaw of a propeller aircraft at VR might be caused by?

#61. Right roll of a propeller aircraft at lift-off might be caused by?

#62. Left yaw and roll of a propeller aircraft in climb out might be caused by?

#63. Right roll and yaw of a propeller aircraft in climb out might be caused by?

#64. Right yaw and roll of a propeller aircraft in climb out might be caused by?

#65. Right yaw of a propeller aircraft at speeds approaching VR might be caused by?

#66. Sudden right yaw and roll of a propeller aircraft at speeds above VR might be caused by?

#67. Centrifugal twisting moment?