Machine Design
For standard coarse threads of nut, the threads will be as strong in failure by shear as the bolt in tension, if the height of nut (h) is approximately

0.8 times
0.4 times
0.6 times
0.7 times

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Machine Design
In case of V belt drive

The belt should not touch the sides of groove in the pulley
The belt should touch the bottom of groove in the pulley
None of these
The belt should not touch the bottom of groove in the pulley

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