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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