Machine Design
The power transmitted by the belt drive can be increased by

Dressing the belt to increase the coefficient of friction
Increasing wrap angle by using idler pulley
Increasing the initial tension in the belt
All of these

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Machine Design
In a hydrodynamic lubricated bearing

There is a thin film of lubricant between the journal and the bearing
There is a thick film of lubricant between the journal and the bearing
The lubricant is forced between the journal and the bearing, by external pressure
There is no lubricant between the journal and the bearing

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