Machine Design
A feather key is generally

Tight in both shaft and hub
Loose in both shaft and hub
Loose in shaft and tight in hub
Tight in shaft and loose in hub

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

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

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