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The couple moment prevents the beam from which of the following process?

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The couple moment prevents the beam from which of the following process?

(a) Relative translation

(b) Relative rotation

(c) Relative transformation

(d) Relative collapse

I had been asked this question in unit test.

This is a very interesting question from Internal Forces Developed in Structural Members topic in section Internal Forces of Engineering Mechanics

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The correct choice is (b) Relative rotation

For explanation I would say: The couple moments are the moments which are the ones which prevent the beam from relative rotation. This means that the rotation generated will be held strongly by the help of the opposite moments generated. The main motto is to make the beam stable and don’t allow the relative rotation to occur.

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