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A coal shows moisture 4, volatile matter 28 and ash 8 per cent. Its fixed carbon is

  • A.40 per cent
  • B.88 per cent
  • C.60 per cent
  • D.68 per cent

Answer: C

Correct answer: 60 per cent

A proximate analysis has four parts that sum to 100, and fixed carbon is the one obtained by difference rather than by direct measurement: \[ 100 - 4 - 28 - 8 = 60\ \text{per cent.} \] It is the combustible residue left on the crucible after the volatile matter has been driven off and before the ash is determined by burning it away.

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