Machine Design
A compound belt drive is used when

Shafts are arranged at right angles and rotate in one definite direction
Shafts are arranged parallel and rotate in the same directions
Shafts are arranged parallel and rotate in the opposite directions
None of these

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Machine Design
In the calculation of induced shear stress in helical springs, the Wahl's stress factor is used to take care of

Combined effect of torsional shear stress and transverse shear stress in the wire
Combined effect of transverse shear stress and curvature of wire
Combined effect of bending stress and curvature of the wire
Combined effect of transverse shear stress and bending stress in the wire

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