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

Maximum at both the centroidal axis and outer surface of the member
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

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Machine Design
When a belt drive is transmitting maximum power,

Driving tension on slack side is equal to centrifugal tension
Effective tension is half of centrifugal tension
Effective tension is equal to centrifugal tension
Driving tension on tight side is twice the centrifugal tension

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