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Assertion (A): Closed-circuit grinding is more efficient than open-circuit grinding.
Reason (R): Material that has reached the required fineness is removed before it can be ground further.

  • A.A is true but R is false
  • B.A is false but R is true
  • C.Both A and R are true, and R is the correct explanation of A
  • D.Both A and R are true, but R is not the correct explanation of A

Answer: C

Both are true and the reason gives the mechanism: in an open circuit everything receives the same treatment, so fine particles are ground needlessly while coarse ones may still leave undersize, and energy is wasted at both ends.

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