Machine Design
An open belt drive is used when

Shafts are arranged parallel and rotate in the opposite directions
Shafts are arranged parallel and rotate in the same directions
Shafts are arranged at right angles and rotate in one definite direction
Driven shaft is to be started or stopped whenever desired without interfering with the driving shaft

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Machine Design
When the belt is transmitting maximum power,

The tension in tight side is thrice the centrifugal tension
None of these
The tension in slack side is equal to the centrifugal tension
The tension in tight side is twice the centrifugal tension

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Machine Design
When a belt drive is transmitting maximum power,

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

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

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