Machine Design
In levers, leverage is the ratio of

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

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Machine Design
An open belt drive is used when

Shafts are arranged parallel and rotate in the same directions
Shafts are arranged at right angles and rotate in one definite direction
Shafts are arranged parallel and rotate in the opposite directions
Driven shaft is to be started or stopped whenever desired without interfering with the driving shaft

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Machine Design
A woodruff key is

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

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