Machine Design
Spring index is

Indication of quality of spring
Load required to produce unit deflection
Ratio of coil diameter to wire diameter
Its capability of storing energy

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Machine Design
The angle of twist of shaft is

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

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