Machine Design
Two shafts ‘A’ and ‘B’ under pure torsion are of identical length and identical weight and are made of the same material. The shaft ‘A’ is solid and the shaft ‘B’ is hollow. We can say that

Shaft B is better than shaft A
None of these
Both the shafts are equally good
Shaft A is better than shaft B

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Machine Design
A stud

Has head at one end and other end fits into a tapped hole in the other part to be joined
Has pointed threads
Has a head on one end and a nut fitted to the other
Has both the ends threaded

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