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Assertion (A): Treating a fuselage frame as a free ring badly overstates its bending moments.

Reason (R): The surrounding skin feeds distributed shear into the frame all the way round.

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. The distributed reaction balances the applied load close to where it acts, so the real moments are far smaller than a free-ring idealisation predicts.

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