Machine Design
Rivets are generally specified by

Thickness of plates to be riveted
Length of rivet
Nominal diameter
Diameter of head

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Machine Design
In an oil lubricated journal bearing, the coefficient of friction between the journal and the bearing

Becomes minimum at an optimum speed and then increases with further increase in speed
Is minimum at zero speed and increases monotonically with increase in speed
Remains constant at all speeds
Is maximum at zero speed and decreases monotonically with increase in speed

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Machine Design
A compound belt drive is used when

Shafts are arranged parallel and rotate in the opposite directions
Shafts are arranged at right angles and rotate in one definite direction
None of these
Shafts are arranged parallel and rotate in the same directions

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