Machine Design
The coefficient of friction between the belt and pulley depends upon the

All of these
Slip of belt
Speed of belt
Material of belt and pulley

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

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

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