Machine Design
In the assembly of pulley, key and shaft

Key is made the strongest
Key is made the weakest
All the three are designed for equal strength
Pulley is made the weakest

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

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