Machine Design
In the assembly of pulley, key and shaft

Pulley is made the weakest
All the three are designed for equal strength
Key is made the weakest
Key is made the strongest

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Machine Design
The angle of twist of shaft is

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

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