Machine Design
The velocity factor for ordinary cut gears operating at velocities up to 12.5 m/s is equal to

4.5/(4.5 + v)
3/(3 + v)
6/(6 + v)
0.75/(0.75 + √v)

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Machine Design
In hydrostatic bearings

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

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Machine Design
Crowning on pulley helps

In increasing the slip of the belt
To keep the belt in centre on a pulley while it is in motion
To increase pulley life
In decreasing the slip of the belt

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