Machine Design
A sliding bearing which operates without any lubricant present, is called

Hydrodynamic lubricated bearing
Hydrostatic lubricated bearing
Zero film bearing
Boundary lubricated bearing

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Machine Design
In worm, gears, pitch lead angle is

Half the angle between two inclined faces in axial plane
The angle between the tangent to the pitch helix and an element of the cylinder
None of these
The angle between the tangent to the pitch helix and the plane of rotation

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