Machine Design
According to Indian standard specifications, plain carbon steel designated by 40C8 contains carbon

0.35 to 0.45%
0.40 to 0.60%
None of these
0.20 to 0.40%

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Machine Design
Spring index is

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

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