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

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Machine Design
Spring index is

Load required to produce unit deflection
Its capability of storing energy
Indication of quality of spring
Ratio of coil diameter to wire diameter

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