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
0.7 times
0.6 times

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Machine Design
Stress concentration is caused due to

Pitting at points or areas at which loads on a member are applied
Variation in properties of material from point to point in a member
All of these
Abrupt change of section

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