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 below the pitch surface
Surface of the tooth above the pitch surface

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Machine Design
A fast and loose pulley drive is used when

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

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