Machine Design
A tapered key which fits in a key way in the hub and is flat on the shaft, is known as

Feather key
Wood ruff key
Gib-head key
Flat saddle key

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Machine Design
Machine screws are

Similar to small size tap bolts except that a greater variety of shapes of heads are available
Used to prevent relative motion between two parts
Similar to stud
Slotted for a screw driver and generally used with a nut

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Machine Design
In case of V belt drive

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

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