Machine Design
The angle of twist of shaft is

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

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Machine Design
The creep in the belt is due to

Unequal extensions in the belt due to tight and slack side tensions
Effect of temperature on belt
Stresses beyond elastic limit of belt material
Material of belt

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