ATPL网上题库4飞行原理.doc

4，飞行原理(1)How can the stability of the atmosphere be determined? AAmbient temperature lapse rate. BAtmospheric pressure at various levels. CSurface 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. AFriction force. BInertial centrifugal force. CCoriolis deflecting force. 正确答案：C (3)One purpose of high-lift devices is to Aincrease the load factor. Bdelay stall. Cincrease airspeed. 正确答案：B (4)The primary purpose of high-lift devices is to increase the AL/Dmax. BLift at low speeds. CDrag and reduce airspeed.正确答案：B (5)Airflow separation over the wing can be delayed by using vortex generators Adirecting high pressure air over the top of the wing or flap through slots and making the wing surface smooth. Bdirecting a suction over the top of the wing or flap through slots and making the wing surface smooth. Cmaking 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. AMotion about the longitudinal. BMotion about the lateral axis. CMotion 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. ANegative longitudinal static stability BNeutral longitudinal dynamic stability CNeutral 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 have been neutralized. ANegative static stability BPositive static stability CNegative dynamic stability 正确答案：A (9)Identify the type stability if the aircraft attitude tends to return to its original after the controls have been neutralized. APositive dynamic stability. BPositive static stability. CNeutral dynamic stability. 正确答案：B (10)What is a characteristic of longitudinal instability? APitch oscillations becoming progressively greater. BBank oscillations becoming progressively greater. CAircraft constantly tries to pitch down. 正确答案：A (11)If the airplane attitude remains in a new position after the elevator control is pressed forward and released, the airplane displays Aneutral longitudinal static stability. Bpositive longitudinal static stability. Cneutral longitudinal dynamic stability. 正确答案：A (12)Which is true regarding the forces acting on an aircraft in a steady-state descent? AThe sum of all upward forces is less than the sum of all downward forces. BThe sum of all rearward forces is greater than the sum of all forces. CThe sum of all forward forces is equal to the sum of all rearward forces. 正确答案：C (13)What performance is characteristic of flight at maximum L/D in a propeller-driven airplane? AMaximum range and distance glide. BBest angle of climb CMaximum endurance.正确答案：A (14)What is the effect on total drag of an aircraft if the airspeed decreases in level flight below that speed for maximum L/D? ADrag increases because of increased induced drag. BDrag increases because of increased parasite drag. CDrag decreases because of lower induced drag. 正确答案：A (15)What is the relationship between induced and parasite drag when the gross weight is increased? Aparasite drag increases more than induced drag Binduced drag increases more than parasite drag Cboth parasite and induced drag are equally increased 正确答案：B (16)What true airspeed and angle of attack should be used to generate the same amount of lift as altitude is increased? AThe same true airspeed and angle of attack BA higher true airspeed for any given angle of attack CA lower true airspeed and higher angle of attack 正确答案：B (17)What will be the ratio between airspeed and lift if the angle of attack and other factors remain constant and airspeed is doubled? Lift will be AThe same. BTwo times greater. CFour times greater. 正确答案：C (18)Why is it necessary to increase back elevator pressure to maintain altitude during a turn? To compensate for the Aloss of the vertical component of lift Bloss of the horizontal component of lift and the increase in centrifugal force Crudder deflection and slight opposite aileron throughout the turn 正确答案：A (19)At which speed will increasing the pitch attitude cause an airplane to climb? ALow speed. BHigh speed. CAny speed. 正确答案：B (20)If no corrective action is taken by the pilot as angle of bank is increased, how is the vertical component of lift and sink rate affected? ALift increases and the sink rate increases. BLift decreases and the sink rate decreases. CLift decreases and the sink rate increases. 正确答案：C (21)If severe turbulence is encountered, which procedure is recommended? Maintain a constant altitude. Maintain a constant attitude. Maintain constant airspeed and altitude. 正确答案：B 【解析】遇到剧烈颠簸，如雷暴中如试图保持某一高度几乎是不可能的，而且这样做会增加机体的压力。这时应允许飞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? AThe same angle of attack. BA lower angle of attack. CA higher angle of attack. 正确答案：B (23)What is a purpose of flight spoilers? AIncrease the camber of the wing. BReduce lift without increasing airspeed. CDirect 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? AReduce the wings lift upon landing. BIncrease the rate of descent without increasing aerodynamic drag. CAid in longitudinal balance when rolling an airplane into a turn. 正确答案：A (25)Which is a purpose of ground spoilers AReduce the wings lift upon landing BAid in rolling an airplane into turn. CIncrease the rate of descent with out gaining airspeed. 正确答案：A (26)What is the purpose of a control tab? AMove the flight controls in the event of manual reversion. BReduce control forces by deflecting in the proper direction to move a primary flight control. CPrevent 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? AReduce the drag caused by supersonic flow over portions of the wing BIncrease the onset of drag divergence and aid in aileron effectiveness at high speed CBreak 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？ AMove the flight controls in the event of manual reversion. BReduce control forces by deflecting in the proper direction to move a primary flight control. CPrevent 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? AProvide horizontal balance as airspeed is increased to allow hands-off flight. BAdjust the speed tail load for different airspeeds in flight allowing neutral control forces. CModify 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? ASame direction. BOpposite direction. CRemains fixed for all positions. 正确答案：B (31)Which direction from the primary control surface does an anti-servo tab move? ASame direction. BOpposite direction. CRemains fixed for all positions. 正确答案：A (32)Which direction from the primary control surface does an elevator adjustable trim tab move when the control surface is moved? ASame direction. BOpposite direction. CRemains fixed for all positions. 正确答案：C (33)What is the reason for variations in geometric pitch along a propeller or rotor blade? AIt permits a relatively constant angle of attack along its length when in cruising flight. BIt prevents the portion of the blade near the hub or root from stalling during cruising flight. CIt permits a relatively constant angle of incidence along its length when in cruising flight. 正确答案：A (34)Which flight conditions of a large jet airplane create the most severe flight hazard by generating wingtip vortices of the greatest strength? AHeavy, slow, gear and flaps up. BHeavy, slow, gear and flaps down. CHeavy, fast, gear and flaps down. 正确答案：A (35)Wingtip vortices created by large aircraft tend to ASink below the aircraft generating the turbulence. BRise from the surface to traffic pattern altitude. CAccumulate and remain for a period of time at the point where the takeoff roll began. 正确答案：A (36)Which statement is true concerning the wake turbulence produced by a large transport aircraft? AVortices can be avoided by flying 300 feet below and behind the flight path of the generating aircraft. BThe vortex characteristics of any given aircraft may be altered by extending the flaps or changing the speed. CWake turbulence behind a propeller-driven aircraft is negligible because jet engine thrust is a necessary factor in the formation of vortices. 正确答案：B (37)If you take off behind a heavy jet that has just landed, you should plan to lift off Aprior to the point where the jet touched down. Bbeyond the point where the jet touched down. Cat the point where the jet touched down and on the upwind edge of the runway.正确答案：B (38)How does the wake turbulence vortex circulate around each wingtip? AInward, upward, and around the wingtip. BCounterclockwise when viewed from behind the aircraft. COutward, upward, and around the wingtip. 正确答案：C (39)Hazardous vortex turbulence that might be encountered behind large aircraft is created only when that aircraft is ADeveloping lift BOperating at high airspeeds CUsing high power settings正确答案：A (40)It is the responsibility of the pilot and crew to report a near midair collision as a result of proximity of at least A500 feet or less to another aircraft. B50 feet or less to another aircraft. C1,000 feet or less to another aircraft.正确答案：A (41)To allow pilots of in-trail lighter aircraft make flight path adjustments to avoid wake turbulence, pilots of heavy and large jet aircraft should fly Abelow the established glidepath and slightly to either side of the on-course centerline. Babove the established glidepath and slightly downwind of the on-course centerline. Con the established glidepath and on the approach course centerline or runway centerline extended.正确答案：C (42)How can the pilot increase the rate of turn and decrease the radius at the same time? ASteepen the bank and increase airspeed. BSteepen the bank and decrease airspeed. CShallow the bank and increase airspeed. 正确答案：B 43)How can turbulent air cause an increase in stalling speed of an airfoil? AAn abrupt change in relative wind. BA decrease in angle of attack. CSudden decrease in load factor. 正确答案：A (44)What is the relationship of the rate of turn with the radius of turn with a constant angle of bank but increasing airspeed? ARate will decrease and radius will increase. BRate will decrease and radius will decrease. CRate and radius will increase. 正确答案：A (45)Which condition would INITIALLY cause the indicated airspeed and pitch to increase and sink rate to decrease? ASudden increase in a headwind component. BSudden decrease in a headwind component. CTailwind which suddenly increase in velocity. 正确答案：A (46)Which of the following is not the way of increasing MCRIT in jet transport designs? AGive the wing a lower camber. BIncrease wing sweep. CAdd slats. 正确答案：C (47)Within what Mach range does transonic flight regimes usually occur? A0.50 to 0.75 Mach B0.75 to 1.20 Mach C1.20 to 2.50 Mach 正确答案：B (48)At what Mach range does the subsonic flight range normally occur? ABelow .75 Mach. BFrom .75 to 1.20 Mach. CFrom 1.20 to 2.50 Mach. 正确答案：A (49)What is the free stream mach number which produce first of local sonic flow? Asupersonic Mach number Btransonic Mach number Ccritical Mach number 正确答案：C (50)What is the highest speed possible without supersonic flow over the wing? Acritical Mach number Binitial buffet speed Ctransonic index正确答案：A (51)Which maximum range factor decrease as weight decrease? AAirspeed. BAngle of attack. CAltitude.正确答案：A (52)Which maximum range factor increases as weight decreases? AAngle of attack. BAltitude. CAirspeed. 正确答案：B (53)What should a pilot do to maintain best range airplane performance when a headwind is encountered? AIncrease speed. BMaintain speed. CDecrease speed. 正确答案：A (54)What should a pilot do to maintain best range airplane performance when a tailwind is encountered? AIncrease speed. BMaintain speed. CDecrease speed. 正确答案：C (55)Which procedure produces the minimum fuel consumption for a given leg of the cruise flight? AIncrease altitude for a headwind, decrease altitude for a tailwind. BIncrease speed for a tailwind. CIncrease speed for a headwind.正确答案：C (56)At what speed, with reference to L/DMAX, does maximum range for a jet airplane occur? AA speed less than that for L/DMAX. BA speed equal to that for L/DMAX. CA speed greater than that for L/DMAX. 正确答案：C (57)Maximum range performance of a turbojet aircraft is obtained by which procedure as aircraft weight reduces? AIncreasing speed or altitude. BIncreasing altitude or decreasing speed. CIncreasing speed or decreasing altitude. 正确答案：B (58)Under what condition should stalls never be practiced in a twin-engine airplane? Awith one engine inoperative Bwith full flaps and gear extended Cwith climb power on正确答案：A (59)V2 or initial climb speed must not be AMore than the take off safety speed BLess than 1.2 VS1 CMore than 1.1 MAC 正确答案：B (60)V2 or rotation speed must not be ALess than V1 BMore than VMCA CLess than VMCG+20 kts正确答案：A (61)At what speed will dynamic hydroplaning begin if tire has pressure 70? A75 knots B85 knots C80 knots正确答案：A (62)As large jet transport aircraft climbs above FL340 as fuel burns off, the IAS turbulence penetration speed will AIncrease. BDecrease. CRemain the same.正确答案：B (63)In relation to take off performance V1 is the speed by which Aa decision has been made Bretardation action is taken Ca margin of 10% exists over VMCG正确答案：A (64)When setting the altimeter, pilot should disregard Acorrections for static pressure systems. Beffects of nonstandard atmospheric temperatures and pressures. Ccorrections for instrument error.正确答案：B (65)In en route flight, the altimeter setting is AQNE BQNH CQFE 正确答案：A (66)What effect, if any, does altitude have on VMC for an airplane with unsupercharged engines? Decreases with altitude None Increases with altitude正确答案：A (67)If the ambient temperature is colder than standard at FL310, what is the relationship between true altitude and pressure altitude? AThey are both the same 31,000 feet. BTrue altitude is lower than 31,000 feet. CPressure altitude is lower than true altitude.正确答案：B (68)What affects indicated stall speed? AWeight, load factor, and power. BLoad factor, angle of attack, and power. CAngle of attack, weight, and airspeed. 正确答案：A (69)What is movement of the center pressure when the wingtips of a sweptwing airplane are shock-stalled first? Ainward and aft Binward and forward Coutward and forward 正确答案：B (70)What is one disadvantage of a sweptwing design? AThe wing root stalls prior to the wingtip section. BThe wingtip section stalls prior to the wing root. CSevere pitchdown moment when the center of pressure shifts forward. 正确答案：B (71)What is the condition known as when gusts cause a sweptwing-type airplane to roll in one direction while yawing in the other? APorpoise. BWingover. CDutch roll 正确答案：C (72)What is the principal advantage of a sweepback design wing over a straightwing design? AThe critical Mach number will increase significantly. BSweepback will increase changes in the magnitude of force coefficients due to compressibility. CSweepback will accelerate the onset of compressibility effect. 正确答案：A (74)Which of the following are considered primary flight controls? ATabs. BFlaps. COutboard ailerons. 正确答案：C (75)Which of the following is considered a primary flight control? ASlats BElevator CDorsal fin 正确答案：B (76)Which of the following is considered an auxiliary flight control? AUpper rudder. BLeading-edge flaps. CRuddervator.正确答案：B (77)When are outboard ailerons normally used? ALow-speed flight only. BHigh-speed flight only. CLow-speed and high-speed flight. 正确答案：A (78)When are inboard ailerons normally used? ALow-speed flight only. BHigh-speed