Machine Design
Crowning on pulley helps

To increase pulley life
In increasing the slip of the belt
In decreasing the slip of the belt
To keep the belt in centre on a pulley while it is in motion

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

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