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Correct Answer : If aircraft generates some restoring force or/and moment without any external help
Explanation : If some disturbance is given to the aircraft and aircraft has initial tendency to generate some restoring force or/and moments without any external means then, we say that the aircraft has initial tendency to return to its original equilibrium position after being disturbed. Hence, it has static stability.
Correct Answer : Option (B) : Flap
Explanation : Flap is a high lift device. Flap is used to increase lift produced by the wing. Flaps are used to increase camber and overall surface area of the wing. This results in increased lift. Dutch roll, phugoid, lateral mode etc. are typical aircraft dynamic modes.
Correct Answer : Option (C) : Phugoid
Explanation : Phugoid mode is an example of longitudinal mode. Dutch and lateral mode are not example of longitudinal mode. Aileron is known as primary control surface. Aileron is used to control the aircraft rolling moment.
Correct Answer : Option (A) : 2.2
Explanation : Critical damping coefficient damping coefficient/ damping ratio 1.1/0.5 = 2.2.
