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

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

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Machine Design
Stress concentration is caused due to

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

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