Machine Design
If threads on a bolt are left hand, threads on nut will be

Could be left or right hand
Right hand with same pitch
Left hand with same pitch
Right hand with fine pitch

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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 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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