Machine Design
The coefficient of friction between the belt and pulley depends upon the

All of these
Slip of belt
Material of belt and pulley
Speed of belt

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Machine Design
When a machine member is subjected to torsion, the torsional shear stress set up in the member is

Zero at the centroidal axis and maximum at the outer surface of the member
Maximum at the centroidal axis and zero at the outer surface of the member
Zero at both the centroidal axis and outer surface of the member
Maximum at both the centroidal axis and outer surface of the member

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Machine Design
Slenderness ratio is the ratio of

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

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