Machine Design
The face of the tooth is the

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

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Machine Design
The angle of twist of shaft is

Directly proportional to (shaft diameter)⁴
Directly proportional to (shaft diameter)²
Inversely proportional to (shaft diameter)⁴
Inversely proportional to (shaft diameter)²

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Machine Design
In case of thick cylinders, the tangential stress across the thickness of cylinder is

Maximum at the outer surface and minimum at the inner surface
Maximum at the outer surface and zero at the inner surface
Maximum at the inner surface and zero at the outer surface
Maximum at the inner surface and minimum at the outer surface

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