Machine Design
In a horizontal flat belt drive, it is customary to use

Top side of belt as slack side
None of these
Idler pulley
Bottom side of belt as slack side

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

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