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

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

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Machine Design
The elasticity is the property of a material which enables it to

Regains its original shape after deformation when the external forces are removed
Retain deformation produced under load permanently
Resists fracture due to high impact loads
Draw into wires by the application of a tensile force

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Machine Design
The angle of twist of shaft is

Inversely proportional to (shaft diameter)²
Inversely proportional to (shaft diameter)⁴
Directly proportional to (shaft diameter)²
Directly proportional to (shaft diameter)⁴

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