Machine Design
At low temperatures (say 75°C) the notched bar impact value of steel

Increases markedly
Decreases markedly
Depends on heat treatment carried out
Remain same

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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 metal to metal contact
Move towards right of the bearing making no metal to metal contact

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