Q:
Determine the corrections or otherwise of the following assertion [A] and reason [R]:
Assertion [A]: Most of the tails are using symmetric airfoils.
Reason[R]: Tail control has two primary control surface.
Answer & Explanation
Answer: B) Both [A] and [R] are true but [R] is not the correct reason for [A]
Explanation: Tail control has two control surface as primary control surface namely elevator and rudder. Tail has main function of providing stability and control. Hence, it should not produce lift at zero angle like wings otherwise it will affect the stability of the aircraft. Hence, [A] and [R] both true but [R] is not correct reason for given [A].
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