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

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

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Machine Design
Crowning on pulley helps

In decreasing the slip of the belt
To keep the belt in centre on a pulley while it is in motion
In increasing the slip of the belt
To increase pulley life

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