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The plant utilisation factor is defined as

  • A.The proportion of machines running at any moment
  • B.The proportion of the year the plant is staffed
  • C.Actual output over rated annual output
  • D.Rated capacity divided by actual output

Answer: C

Correct answer: Actual output over rated annual output

\[ \text{Utilisation factor} = \frac{\text{actual annual output}}{\text{rated annual output}} \]

It measures how much of the installed capacity is actually used over a year. In a seasonal plant it is inevitably low - often 20 to 30 per cent - because the capacity is set by the peak, not the average.

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