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Assertion (A): Gas and feed move in opposite directions through a cement kiln.
Reason (R): Counter-current flow extracts more heat from the gas than co-current flow would.

  • 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 design principle: the gas gives up heat progressively as it travels towards the cold end, so it leaves the system at a far lower temperature than it would if it travelled with the charge.

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