Machine Design
The resilience of a bolt may be increased by

Decreasing its length
Increasing its length
Decreasing its shank diameter
Increasing its shank diameter

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

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

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