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

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

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Machine Design
Cap screws are

Slotted for a screw driver and generally used with a nut
Similar to small size tap bolts except that a greater variety of shapes of heads are available
Used to prevent relative motion between parts
Provided with detachable caps

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