Machine Design
The fatigue stress concentration factor is defined as

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

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Machine Design
When the shaft rotates in anticlockwise direction at high speed in a bearing, it will

Move towards left of the bearing making metal to metal contact
Move towards right of the bearing making metal to metal contact
Have contact at the bottom most of the bearing
Move towards right of the bearing making no metal to metal contact

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