Machine Design
In static loading, stress concentration is more serious in

Brittle as well as ductile materials
Brittle materials
Elastic materials
Ductile materials

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

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
Move towards left of the bearing making metal to metal contact

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