Machine Design
If shearing stress in nut is half the tensile stress in a bolt, then nut length should be equal to

0.75 × diameter of bolt
1.25 × diameter of bolt
1.5 × diameter of bolt
Diameter of bolt

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Machine Design
Pitch point of a cam is

Any point on the pitch circle
Any point on the pitch curve
A point on the pitch curve having maximum pressure angle
A point on the pitch curve having minimum pressure angle

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