Machine Design
When carbon in the cast iron is principally in the form of graphite, the cast iron will be of

White colour
Yellow colour
Grey colour
Brown colour

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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 maximum at zero speed and decreases monotonically with increase in speed
Is minimum at zero speed and increases monotonically with increase in speed
Remains constant at all speeds

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