Machine Design
A key capable of tilting in a recess milled out in a shaft is known as

Woodruff key
Hollow saddle key
Feather key
Flat saddle key

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Machine Design
In case of V belt drive

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

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