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)

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

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Machine Design
When the belt speed increases

Power transmitted decreases
Power transmitted increases to a maximum value and then decreases
Power transmitted remains the same
Power transmitted increases

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Machine Design
Slenderness ratio is the ratio of

Effective length of column to width of column
Maximum size of column to minimum size of column
Effective length of column to least radius of gyration of the column
Width of column to depth of column

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