Machine Design
For a square key made of mild steel, the shear and crushing strength are related as

Shear strength is greater than crushing strength
Shear strength is less than crushing strength
None of these
Shear strength is equal to crushing strength

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Machine Design
In oilness bearings

Do not require external supply of lubricant
The oil film pressure is generated only by the rotation of the journal
The oil film is maintained by supplying oil under pressure
Grease required to be applied after some intervals

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