Machine Design
When the speed of belt increases,

The coefficient of friction between the belt and pulley decreases
The power transmitted will decrease
The power transmitted will increase
The coefficient of friction between the belt and pulley increases

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Machine Design
In a hydrodynamic lubricated bearing

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

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