Machine Design
Form coefficient of spring is

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

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Machine Design
In order to determine the stresses in a thin cylinder due to an internal pressure, it is assumed that

The tensile stresses are uniformly distributed over the section of the walls
The effect of curvature of the cylinder wall is neglected
All of these
The effect of the restraining action of the heads at the end of the pressure vessel is neglected

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