Machine Design
When the speed of belt increases,

The coefficient of friction between the belt and pulley decreases
The power transmitted will increase
The power transmitted will decrease
The coefficient of friction between the belt and pulley increases

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Machine Design
The angle of twist of shaft is

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

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