Machine Design
According to Indian standards, the diameter of rivet hole is made larger than the basic size of rivet by

All of these
1 mm for rivet diameter from 27 mm to 36 mm
2 mm for rivet diameter from 39 mm to 48 mm
0.5 mm up to rivet diameter of 24 mm

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Machine Design
Spring index is

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

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