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Consider the following statements about specific energy consumption.

1. It normalises for output   2. It may rise while total consumption falls   3. It equals the marginal energy per unit produced

  • A.1, 2 and 3 are all correct statements about specific consumption
  • B.2 and 3 only are correct
  • C.1 and 3 only are correct
  • D.1 and 2 only are correct

Answer: D

Correct answer: 1 and 2 only are correct

Statements 1 and 2 are correct, and the second is the point of the preceding calculation: specific consumption can rise while the total falls, if output falls further. Statement 3 confuses two different quantities - specific consumption is an average and includes a share of the fixed load, while the marginal figure is the slope and excludes it.

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