Machine Design
In skew bevel gearing, the axes of shafts are

Non-intersecting and nonparallel and the teeth are curved
Intersecting and the teeth are curved
None of these
Non-intersecting and non-parallel and the teeth are straight

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Machine Design
In a hydrodynamic lubricated bearing

There is a thick film of lubricant between the journal and the bearing
The lubricant is forced between the journal and the bearing, by external pressure
There is a thin film of lubricant between the journal and the bearing
There is no lubricant between the journal and the 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
Becomes minimum at an optimum speed and then increases with further increase in speed
Remains constant at all speeds
Is minimum at zero speed and increases monotonically with increase in speed

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