Machine Design
The fatigue stress concentration factor is defined as

The ratio of endurance limit without stress concentration to the endurance limit with stress concentration
All of these
The ratio of endurance limit with stress concentration to the endurance limit without stress concentration
The product of the endurance limits with and without stress concentration

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Machine Design
A compound belt drive is used when

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

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