Machine Design
In order to ensure self locking in a screw jack, it is essential that helix angle is __________ friction angle.

Larger than
None of these
Equal to
Smaller than

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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
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

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