Machine Design
The face of the tooth is the

Width of the tooth measured along the pitch circle
Surface of the top of the tooth
Surface of the tooth above the pitch surface
Surface of the tooth below the pitch surface

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Machine Design
A woodruff key is

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

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Machine Design
A compound belt drive is used when

Shafts are arranged parallel and rotate in the opposite directions
Shafts are arranged parallel and rotate in the same directions
None of these
Shafts are arranged at right angles and rotate in one definite direction

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