Machine Design
In a horizontal flat belt drive, it is customary to use

Idler pulley
Bottom side of belt as slack side
None of these
Top side of belt as slack side

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Machine Design
A bolt of uniform strength can be developed by

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

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Machine Design
For unequal width of butt straps, the thicknesses of butt straps are

0.75 t for wide strap on the inside and 0.625 t for narrow strap on the outside
0.75 t for both the straps on the inside and outside
0.625 t for both the straps on the inside and outside
0.75 t for narrow strap on the inside and 0.625 t for wide strap on the outside

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