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

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Machine Design
In an oil lubricated journal bearing, the coefficient of friction between the journal and the bearing

Is maximum at zero speed and decreases monotonically with increase in speed
Remains constant at all speeds
Becomes minimum at an optimum speed and then increases with further increase in speed
Is minimum at zero speed and increases monotonically with increase in speed

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