正确答案：A
(78)When are inboard ailerons normally used?
? ? ?
A．Low-speed flight only. B．High-speed flight only.
C．Low-speed and high-speed flight.
正确答案：C
(79)By changing the angle of attack of a wing, the pilot can control the airplane's
? ? ?
A．lift, gross weight, and drag. B．lift, airspeed, and drag. C．lift and airspeed, but not drag.
正确答案：B
80)Why do some airplanes equipped with
inboard/outboard ailerons use the outboards for slow flight only?
?
A．Increased surface area provides greater controllability with flap extension.
?
B．Aerodynamic loads on the outboard ailerons tend to twist the wingtips at high speeds.
?
C．Locking out the outboard ailerons in high-speed flight provides variable flight control feel.
正确答案：B
(81)What is the primary function of the leading edge flaps in landing configuration during the flare before touchdown?
? ? ?
A．prevent flow separation. B．decrease rate of sink. C．increase profile drag.
正确答案：A
(82)Which is a purpose of leading-edge slats on high-performance wings?
?
A．Direct air from the low pressure area under the leading edge along the top of the wing.
?
B．Improve aileron control during low angles of attack.
?
C．Increase lift at relative slow speeds.
正确答案：C
(83)What effect does the leading edge slot in the wing have on performance?
? ?
A．Decreases profile drag.
B．Changes the stalling angle of attack to a higher angle.
?
C．Decelerates the upper surface boundary layer air.
正确答案：B
(84)What does the blue radial line on the airspeed indicator of a light, twin-engine airplane represent?
? ? ?
A．Maximum single-engine rate of climb． B．Maximum single-engine angle of climb． C．Minimum controllable airspeed for single-engine operation.
正确答案：A
(85)During an en route descent in a fixed-thrust and fixed-pitch attitude configuration, both the ram air input and drain hole of the pitot system become completely blocked by ice. What airspeed indication can be expected?
? ? ?
A．Increase in indicated airspeed. B．Decrease in indicated airspeed.
C．Indicated airspeed remains at the value prior to icing
正确答案：B
(86)What can a pilot expect if the pitot system ram air input and drain hole are blocked by ice?
? ?
A．The airspeed indicator may act as an altimeter. B．The airspeed indicator will show a decrease with an increase in altitude
?
C．No airspeed indicator change will occur during climbs or descents
正确答案：A
(87)If both the ram air input and drain hole of the pitot system are blocked by ice, what airspeed indication can be expected?
?
A．No variation of indicated airspeed in level flight if large power changes are made
? ?
B．Decrease of indicated airspeed during a climb C．Constant indicated airspeed during a descent
正确答案：A