Machine Design
The fatigue stress concentration factor is defined as

The product of the endurance limits with and without stress concentration
The ratio of endurance limit without stress concentration to the endurance limit with stress concentration
All of these
The ratio of endurance limit with stress concentration to the endurance limit without stress concentration

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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

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

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