Main methods of suppress the airflow separation are: ____.
A. Using vortex generator.
B. Using air blowing control at separation position
C. Launch a high-speed jet at the leading edge of the wing.
D. Control the angle of attack of the wing.
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The influences of wingtip trailing vortex are: ____.
A. The efficiency of the airport
B. The efficiency of aircraft’s take-off and landing
C. The lift of the plane
D. Increase the induced drag
The main noise sources on the airframe includes: ____.
Aerodynamic noises of high lift device
B. Aerodynamic noises of landing gear
C. Interference noises among the aircraft
D. Jet noise of engine
For an aircraft to fly continuously and steadily in the sky, the most basic conditions should be met are: ____.
A. Sufficient lift
B. Sufficient power
C. Good piloting technique
D. Good stability and maneuverability
The main characteristics of a piston engines include: ____.
A. More efficient when flying at low speed
B. Are direct reaction engines
C. When the aircraft's flight speed exceeds 700-800 kilometers per hour, the propulsion efficiency will also drop sharply
D. Widely used in some small and low-speed aircraft
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