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Water for boiler feed must meet a tighter specification than water for dyeing chiefly because

  • A.the steam must be entirely free of colour
  • B.dissolved solids concentrate and form scale
  • C.the boiler operates at a lower temperature
  • D.the boiler uses a great deal more water

Answer: B

Everything dissolved in the feed stays behind as the water evaporates, so the concentration in the drum rises steadily. Blowdown and demineralisation are used to keep it within limits. Scale on a heated surface is dangerous as well as wasteful.

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