Machine Design
The flank of the tooth is the

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

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Machine Design
A compound belt drive is used when

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

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