Machine Design
When an open coiled helical compression spring is subjected to an axial compressive load, the maximum shear stress induced in the wire is (where D = Mean diameter of the spring coil, d = Diameter of the spring wire, K = Wahl's stress factor, and W = Axial compressive load on the spring)

(2WD/ πd3) × K
(4WD/ πd3) × K
(8WD/ πd3) × K
(WD/ πd3) × K

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Machine Design
Which is correct statement?

A member made of steel will generally be more rigid than a member of equal load carrying ability made of cast iron
Which one is rigid will depend on several other factors
A member made of cast iron will generally be more rigid than a member of equal load carrying ability made of steel
Both will be equally rigid

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Machine Design
Spring stiffness is

Ratio of coil diameter to wire diameter
Its capability of storing energy
Load required to produce unit deflection
Its ability to absorb shocks

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