Machine Design
Crowning on pulley helps

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

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Machine Design
The shear stress at a point in a shaft subjected to a torque is

Directly proportional to the polar moment of inertia and to the distance of the point from the axis
Directly proportional to the applied torque and the polar moment of inertia
Inversely proportional to the applied torque and the polar moment of inertia
Directly proportional to the applied torque and inversely proportional to the polar moment of inertia

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Machine Design
The face of the tooth is the

Width of the tooth measured along the pitch circle
Surface of the top of the tooth
Surface of the tooth above the pitch surface
Surface of the tooth below the pitch surface

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Machine Design
A stud

Has head at one end and other end fits into a tapped hole in the other part to be joined
Has both the ends threaded
Has pointed threads
Has a head on one end and a nut fitted to the other

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