Machine Design
In worm gears, the angle between the tangent to the pitch helix and an element of the cylinder, is known as

Pitch lead angle
None of these
Helix angle
Pressure angle

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Machine Design
In a hydrodynamic lubricated 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 thin film of lubricant between the journal and the bearing
There is a thick film of lubricant between the journal and the bearing

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