Machine Design
Lewis equation is applied

Only to the pinion
To stronger of the pinion or gear
To weaker of the pinion or gear
Only to the gear

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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
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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