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

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

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Machine Design
The contact ratio is the ratio of

Length of arc of contact to the circular pitch
Length of arc of recess to the circular pitch
Length of arc of approach to the circular pitch
Length of path of contact to the circular pitch

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