Machine Design
According to I.B.R., when the thickness of boiler shell (t) is greater than 8 mm, then the diameter of rivet hole (d) is obtained by

None of these
Equating shearing resistance to the crushing resistance of the rivets
Equating tearing resistance of the plate to the crushing resistance of the rivets
Equating tearing resistance of the plate to the shearing resistance of the rivets

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Machine Design
Form coefficient of spring is

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

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