Machine Design
The shear stress in a beam varies from zero at the outer fibers to a maximum at the________.

Lower surface
None of these
Neutral surface
Upper surface

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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
Crowning on pulley helps

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

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