Machine Design
A key made from a cylindrical disc having segmental cross-section, is known as

Feather key
Woodruff key
Flat saddle key
Gib head key

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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
Axial load plus stress due to acceleration/retardation
Axial load plus stress due to bending
Bending plus stress due to acceleration/retardation

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