Machine Design
In order to obtain bolt of uniform strength

Increase shank diameter
Tighten die bolt properly
Increase its length
Drill an axial hole through head up to threaded portion so that shank area is equal to root area of thread

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Machine Design
When the belt is transmitting maximum power,

None of these
The tension in tight side is thrice the centrifugal tension
The tension in tight side is twice the centrifugal tension
The tension in slack side is equal to the centrifugal tension

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