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

Helix angle
None of these
Pitch lead angle
Pressure angle

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Machine Design
In hydrostatic bearings

The Oil film pressure is generated only by the rotation of the journal
The oil film is maintained by supplying oil under pressure
Grease is used for lubrication
Do not require external supply of lubricant

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