Machine Design
Crowning on pulley helps

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

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

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

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