Machine Design
The ball bearings are provided with a cage

To maintain the balls at a fixed distance apart
To prevent the lubricant from flowing out
To reduce friction
To facilitate slipping of balls

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

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