Which of following belongs to passive control in the noise control of aircraft? ____.
Adopting fairings
Blowing control
C. Aspirating control
D. Plasma micro jet.
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The engine suitable for hypersonic vehicles is ____.
A. Turbojet
B. Fanjet
C. Propjet
D. Ramjet
The expansion stroke of a piston engines is ____.
A. Intake
B. Compression
Combustion
D. Exhaust
The most basic type of air jet engine is ____.
A. Turbojet
B. Fanjet
C. Propjet
D. Ramjet
The civil turbofan engine with good performance now has a bypass ratio nears ____.
A. 6
B. 8
C. 10
D. 12
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