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Assertion: a plant's specific energy consumption must be normalised before it is benchmarked. Reason: product mix and capacity utilisation change the figure without any change in efficiency.

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

Answer: A

Correct answer: both the assertion and the reason are true and the reason explains the assertion

Both are true and the reason gives the necessity. A plant running at part load or making a different product mix will show a different specific consumption without any change in how well it uses energy, so an unnormalised comparison against a benchmark measures the circumstances rather than the performance. Normalisation removes those effects before the comparison is made.

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