1.

Critical Speed (Nc) of a ball mill is given by(where R1 and R2 are radii of ball mill and the ball respectively).

A. <img src="/_files/images/chemical-engineering/mechanical-operations/105-117-1.png">
B. <img src="/_files/images/chemical-engineering/mechanical-operations/105-117-2.png">
C. <img src="/_files/images/chemical-engineering/mechanical-operations/105-117-3.png">
D. <img src="/_files/images/chemical-engineering/mechanical-operations/105-117-4.png">
Answer» C. <img src="/_files/images/chemical-engineering/mechanical-operations/105-117-3.png">


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