Machine Design
The ball bearings are provided with a cage

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

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Machine Design
Which is correct statement?

A member made of steel will generally be more rigid than a member of equal load carrying ability made of cast iron
A member made of cast iron will generally be more rigid than a member of equal load carrying ability made of steel
Which one is rigid will depend on several other factors
Both will be equally rigid

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