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

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

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Machine Design
When the belt speed increases

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

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