Machine Design
Spring index is

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

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

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Machine Design
For unequal width of butt straps, the thicknesses of butt straps are

0.75 t for wide strap on the inside and 0.625 t for narrow strap on the outside
0.75 t for both the straps on the inside and outside
0.75 t for narrow strap on the inside and 0.625 t for wide strap on the outside
0.625 t for both the straps on the inside and outside

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