ATPL网上题库4飞行原理

4，飞行原理 (1)How can the stability of the atmosphere be determined?  A． Ambient temperature lapse rate.  B． Atmospheric pressure at various levels.  C． Surface temperature/dewpoint spread. 正确答案：A (2)____ prevents air flowing directly from the high pressure area to low pressure area when air moves in a level direction.  A． Friction force.  B． Inertial centrifugal force.  C． Coriolis deflecting force. 正确答案：C (3)One purpose of high-lift devices is to  A． increase the load factor.  B． delay stall.  C． increase airspeed. 正确答案：B (4)The primary purpose of high-lift devices is to increase the  A． L/Dmax.  B． Lift at low speeds.  C． Drag and reduce airspeed. 正确答案：B (5)Airflow separation over the wing can be delayed by using vortex generators  A． directing high pressure air over the top of the wing or flap through slots and making the wing surface smooth.  B． directing a suction over the top of the wing or flap through slots and making the wing surface smooth.  C． making the wing surface rough and/or directing high pressure air over the top of the wing or flap through slots. 正确答案：C (6)Describe dynamic longitudinal stability.  A． Motion about the longitudinal.  B． Motion about the lateral axis.  C． Motion about the vertical axis. 正确答案：B (7)Identify the type stability if the aircraft attitude remains in new position after the controls have been neutralized.  A． Negative longitudinal static stability  B． Neutral longitudinal dynamic stability  C． Neutral longitudinal static stability 正确答案：C (8)Identify the type stability if the aircraft attitude tends to move farther from its original position after the controls...