Machine Design
In oilness bearings

The oil film pressure is generated only by the rotation of the journal
Grease required to be applied after some intervals
Do not require external supply of lubricant
The oil film is maintained by supplying oil under pressure

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Machine Design
A fast and loose pulley drive is used when

Shafts are arranged parallel and rotate in the opposite directions
Driven shaft is to be started or stopped whenever desired without interfering with the driving shaft
Shafts are arranged at right angles and rotate in one definite direction
Shafts are arranged parallel and rotate in the same directions

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Machine Design
A bolt

Has both the ends threaded
Is provided with pointed threads
Has head at one end and other end fits into a tapped hole in the other part to be joined
Has a head on one end and a nut fitted to the other

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