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

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Machine Design
The creep in the belt is due to

Effect of temperature on belt
Stresses beyond elastic limit of belt material
Material of belt
Unequal extensions in the belt due to tight and slack side tensions

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