Machine Design
The angle of twist of shaft is

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

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Machine Design
When the belt speed increases

Power transmitted increases to a maximum value and then decreases
Power transmitted increases
Power transmitted decreases
Power transmitted remains the same

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