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What is the maximum speed up to which the clamp can be rotated in a torsion test?

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What is the maximum speed up to which the clamp can be rotated in a torsion test?

(a) 120rpm

(b) 2rpm

(c) -26rpm

(d) 60rpm

I got this question in an online interview.

Asked question is from Aircraft Materials in chapter Testing Aircraft Materials of Aerospace Materials & Processes

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Right answer is (d) 60rpm

To explain I would say: The torsion test experimental set up contains two clamps. One is rotatable and the other fixed. The rotatable clamp is moved at a rate of 60rpm (rotations per minute) at maximum. This is because exceeding that speed might cause heating.

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