Machine Design
Which of the following bearing is preferred for oscillating conditions?

Angular contact single row ball bearing
Taper roller bearing
Double row roller bearing
Needle roller bearing

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

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

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