Machine Design
Stress concentration is caused due to

All of these
Pitting at points or areas at which loads on a member are applied
Variation in properties of material from point to point in a member
Abrupt change of section

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

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

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Machine Design
Turn buckle has

Left hand threads on both ends
Left hand threads on one end and right hand threads on other end
No threads
Right hand threads on bout ends

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