Machine Design
In levers, leverage is the ratio of

Load arm to the effort arm
Mechanical advantage to the velocity ratio
Effort arm to the load arm
Load lifted to the effort applied

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Machine Design
In case of V belt drive

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

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Machine Design
A woodruff key is

A tapered key with head at one end
All of these
Capable of tilting in a recess milled out in the shaft
Fitted in pairs at right angles

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