Machine Design
According to Indian standard specifications, plain carbon steel designated by 40C8 contains carbon

None of these
0.35 to 0.45%
0.40 to 0.60%
0.20 to 0.40%

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

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

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