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
Form coefficient of spring is

Concerned with strength of wire of spring
Load required to produce unit deflection
Its capability of storing energy
Ratio of coil diameter to wire diameter

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