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

Remains constant at all speeds
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

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Machine Design
According to Indian standard specifications, 100 H6/g5 means that

Tolerance grade for the shaft is 4 to 8 and for the hole is 3 to 7
Tolerance grade for the shaft is 6 and for the hole is 5
Tolerance grade for the hole is 4 to 8 and for the shaft is 3 to 7
Tolerance grade for the hole is 6 and for the shaft is 5

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