Machine Design
Cap screws are

Similar to small size tap bolts except that a greater variety of shapes of heads are available
Used to prevent relative motion between parts
Provided with detachable caps
Slotted for a screw driver and generally used with a nut

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Machine Design
In a hydrodynamic lubricated bearing

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

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Machine Design
The creep in the belt is due to

Stresses beyond elastic limit of belt material
Material of belt
Effect of temperature on belt
Unequal extensions in the belt due to tight and slack side tensions

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