Machine Design
Wire ropes as compared to cotton ropes

Can withstand shock loads
Are lighter in weight
Offer silent operation
All of these

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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
In hydrodynamic bearings

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

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