Machine Design
In case of V belt drive

The belt should not touch the bottom of groove in the pulley
The belt should not touch the sides of groove in the pulley
None of these
The belt should touch the bottom of groove in the pulley

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Machine Design
Stress concentration is caused due to

Abrupt change of section
Variation in properties of material from point to point in a member
Pitting at points or areas at which loads on a member are applied
All of these

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

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