Machine Design
The ball bearings are provided with a cage

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

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Machine Design
In an oil lubricated journal bearing, the coefficient of friction between the journal and the bearing

Becomes minimum at an optimum speed and then increases with further increase in speed
Remains constant at all speeds
Is maximum at zero speed and decreases monotonically with increase in speed
Is minimum at zero speed and increases monotonically with increase in speed

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Machine Design
The designation M 33 × 2 of a bolt means

Metric threads of 33 numbers in 2 cm
Metric threads with cross-section of 33 mm
Bolt of 33 mm nominal diameter having 2 threads per cm
Metric threads of 33 mm outside diameter and 2 mm pitch

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