Machine Design
The coefficient of friction in belt drive depends upon

Material of pulley
Material of belt
Belt velocity
Materials of belt and pulley

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Machine Design
The effective stress in wire ropes during normal working is equal to the stress due to

Acceleration/retardation of masses plus stress due to bending
Bending plus stress due to acceleration/retardation
Axial load plus stress due to bending
Axial load plus stress due to acceleration/retardation

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Machine Design
When the shaft rotates in anticlockwise direction at slow speed in a bearing, it will

Have contact at the bottom most of the bearing
Move towards right of the bearing making the metal to metal contact
Move towards right of the bearing making no metal to metal contact
Move towards left of the bearing making metal to metal contact

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