Machine Design
The centrifugal tension in the belt

Decreases the power transmitted
Is equal to maximum tension on the belt
Increases the power transmitted
Has no effect on the power transmitted

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Machine Design
The angle of twist of shaft is

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

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