Machine Design
A fast and loose pulley drive is used when

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
Driven shaft is to be started or stopped whenever desired without interfering with the driving shaft

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Machine Design
For same pulley diameters, center distance, belt speed and belt and pulley materials,

Crossed belt drive transmits more power than open belt drive
Power transmission does not depend upon open and crossed types of constructions
Open belt drive transmits more power than crossed belt drive
Open and crossed belt drives transmit same power

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Machine Design
The flank of the tooth is the

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

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