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Assertion: flue gas should be cooled as far as possible in a heat recovery device. Reason: the more heat recovered, the greater the saving.

  • A.the assertion is true but the reason given for it is false
  • B.the assertion is false although the reason offered is a true statement in itself
  • C.both the assertion and the reason are true and the reason explains the assertion
  • D.both the assertion and the reason are true but the reason does not explain the assertion

Answer: B

More recovery is indeed worth more, but below the acid dew point sulphuric acid condenses and destroys the recovery surfaces, so the cooling must stop above it. The reason is sound and the conclusion drawn from it is not.

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