第一章 单元测试

1、单选题：
With respect to the certification of airmen, which is a category of aircraft? （ ）
选项：
A:Gyroplane, helicopter, airship, free balloon
B:Single-engine land and sea, multiengine land and sea
C:Airplane, rotorcraft, glider, lighter-than-air
答案: 【Airplane, rotorcraft, glider, lighter-than-air】

2、单选题：
With respect to the certification of airmen, which is a class of aircraft? （ ）
选项：
A:Lighter-than-air, airship, hot air balloon, gas balloon
B:Airplane, rotorcraft, glider, lighter-than-air
C:Single-engine land and sea, multiengine land and sea
答案: 【Single-engine land and sea, multiengine land and sea】

3、单选题：
With certain exceptions, safety belts are required to be secured about passengers during （ ）
选项：
A:flight in turbulent air.
B:taxi, takeoffs, and landings.
C:all flight conditions.
答案: 【taxi, takeoffs, and landings.】

4、单选题：
With respect to the certification of aircraft, which is a category of aircraft （ ）
选项：
A:Landplane, seaplane.
B:Airplane, rotorcraft, glider.
C:Normal, utility, acrobatic.
答案: 【Normal, utility, acrobatic.】

5、单选题：
With respect to the certification of aircraft, which is a class of aircraft? （ ）
选项：
A:Transport, restricted, provisional.
B:Normal, utility, acrobatic, limited.
C:Airplane, rotorcraft, glider, balloon.
答案: 【Airplane, rotorcraft, glider, balloon.】

第二章 单元测试

1、单选题：
It is important to ensure that the surfaces of an aircraft wing are clean. Small paint chips, excessive bugs, or dirt can reduce the efficiency of the wing. This type of drag is called（ ）
选项：
A:skin friction.
B:induced drag.
C:interference drag.
答案: 【skin friction.】

2、单选题：
The angle between the chord line of an airfoil and the relative wind is known as the angle of（ ）
选项：
A:incidence
B:attack.
C:lift.
答案: 【attack.】

3、单选题：
The left turning tendency of an airplane caused by P-factor is the result of the（ ）
选项：
A:gyroscopic forces applied to the rotating propeller blades acting 90° in advance of the point the force was applied
B:clockwise rotation of the engine and the propeller turning the airplane counter- clockwise.
C:propeller blade descending on the right, producing more thrust than the ascending blade on the left.
答案: 【propeller blade descending on the right, producing more thrust than the ascending blade on the left.】

4、单选题：
What is the relationship of lift, drag, thrust, and weight when the airplane is in straight-and-level flight?（ ）
选项：
A:Lift and weight equal thrust and drag.
B:Lift equals weight and thrust equals drag.
C:Lift, drag, and weight equal thrust.
答案: 【Lift equals weight and thrust equals drag.】

5、单选题：
Wing fences（ ）
选项：
A:reduce parasite drag.
B:improve aircraft handling at slower airspeeds.
C:reduce control pressures.
答案: 【improve aircraft handling at slower airspeeds.】