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

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

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Machine Design
According to I.B.R., when the thickness of the boiler shell (t) is less than 8 mm, then the diameter of the rivet hole (d) is obtained by

Equating shearing resistance to the crushing resistance of the rivets
Equating tearing resistance of the plate to the crushing resistance of the rivets
None of these
Equating tearing resistance of the plate to the shearing resistance of the rivets

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Machine Design
Which is correct statement?

A member made of steel will generally be more rigid than a member of equal load carrying ability made of cast iron
Which one is rigid will depend on several other factors
A member made of cast iron will generally be more rigid than a member of equal load carrying ability made of steel
Both will be equally rigid

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