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Assertion (A): Wing torsional stiffness is defended carefully during design.

Reason (R): It sets both the divergence speed and the aileron reversal speed.

Select the correct answer from the options below.

  • A.A is true but R is false
  • B.A is false but R is true
  • C.Both A and R are true, and R is the correct explanation of A
  • D.Both A and R are true, but R is not the correct explanation of A

Answer: C

Both statements are true and the second is the reason for the first. Both speeds must lie comfortably outside the flight envelope, and since both rise with torsional stiffness, the closed box's integrity is an aeroelastic requirement as much as a strength one.

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