Machine Design
When the pulley or other mating piece is required to slide along the shaft, a __________ sunk key is used.

None of these
Square
Parallel
Rectangular

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Machine Design
In a hydrodynamic lubricated bearing

There is a thin film of lubricant between the journal and the bearing
There is no lubricant between the journal and the bearing
The lubricant is forced between the journal and the bearing, by external pressure
There is a thick film of lubricant between the journal and the bearing

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