Machine Design
The angle of twist of shaft is

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

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Machine Design
In replacing the V-belts, a complete set of new belts is used instead of replacing a single damaged belt because

New and old belts will cause vibrations
Only one belt cannot be fitted with other used belts
Belts are available in sets
The new belt will carry more than its share and result in short life

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

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

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