Machine Design
The ball bearings are provided with a cage

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

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Machine Design
A compound belt drive is used when

None of these
Shafts are arranged parallel and rotate in the same directions
Shafts are arranged parallel and rotate in the opposite directions
Shafts are arranged at right angles and rotate in one definite direction

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