Machine Design
When the speed of belt increases,

The coefficient of friction between the belt and pulley decreases
The power transmitted will increase
The coefficient of friction between the belt and pulley increases
The power transmitted will decrease

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Machine Design
A bolt of uniform strength can be developed by

Keeping the core diameter of threads equal to the diameter of unthreaded portion of the bolt
Keeping the nominal diameter of threads equal to the diameter of unthreaded portion of the bolt
None of these
Keeping the core diameter smaller than the diameter of the unthreaded portion

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