ATPL网上题库4飞行原理

机随气流升降并保持飞机的姿态,这样机体承受的压力将是最小的。

(22)How can an airplane produce the same lift in ground effect as when out of ground effect?

? ? ?

A.The same angle of attack. B.A lower angle of attack. C.A higher angle of attack.

正确答案:B

(23)What is a purpose of flight spoilers?

? ? ?

A.Increase the camber of the wing.

B.Reduce lift without increasing airspeed. C.Direct airflow over the top of the wing at high angles of attack.

正确答案:B

(24)For which purpose may flight spoilers be used?

? ?

A.Reduce the wings' lift upon landing. B.Increase the rate of descent without increasing aerodynamic drag.

?

C.Aid in longitudinal balance when rolling an airplane into a turn.

正确答案:A

(25)Which is a purpose of ground spoilers

? ? ?

A.Reduce the wings lift upon landing B.Aid in rolling an airplane into turn. C.Increase the rate of descent with out gaining airspeed.

正确答案:A

(26)What is the purpose of a control tab?

?

A.Move the flight controls in the event of manual reversion.

?

B.Reduce control forces by deflecting in the proper direction to move a primary flight control.

?

C.Prevent a control surface from moving to a full-deflection position due to aerodynamic forces.

正确答案:A

(27)Which is a purpose of wing-mounted vortex generators?

?

A.Reduce the drag caused by supersonic flow over portions of the wing

?

B.Increase the onset of drag divergence and aid in aileron effectiveness at high speed

?

C.Break the airflow over the wing so the stall will progress from the root out to the tip of the wing

正确答案:A

(28)What is the purpose of a servo tab?

?

A.Move the flight controls in the event of manual reversion.

?

B.Reduce control forces by deflecting in the proper direction to move a primary flight control.

?

C.Prevent a control surface from moving to a full-deflection position due to aerodynamic forces.

正确答案:B

(29)What is the purpose of an elevator trim tab?

?

A.Provide horizontal balance as airspeed is increased to allow hands-off flight.

?

B.Adjust the speed tail load for different airspeeds in flight allowing neutral control forces.

?

C.Modify the downward tail load for various airspeeds in flight eliminating flight-control pressures.

正确答案:C

(30)Which direction from the primary control surface does a servo tab move?

? ? ?

A.Same direction. B.Opposite direction.

C.Remains fixed for all positions.

正确答案:B

(31)Which direction from the primary control surface does an anti-servo tab move?

? ? ?

A.Same direction. B.Opposite direction.

C.Remains fixed for all positions.

正确答案:A

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