Machine Design
The fatigue stress concentration factor is defined as

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

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Machine Design
Crowning on pulley helps

To increase pulley life
To keep the belt in centre on a pulley while it is in motion
In decreasing the slip of the belt
In increasing the slip of the belt

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