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Assertion (A): Boiler water is blown down periodically.
Reason (R): Dissolved solids concentrate in the drum as steam is raised and must be removed.

  • A.A is true but R is false
  • B.A is false but R is true
  • C.Both A and R are true, and R is the correct explanation of A
  • D.Both A and R are true, but R is not the correct explanation of A

Answer: C

Both are true and the reason gives the necessity: the blowdown carries away both the concentrated solids and a good deal of heat, so its rate is a compromise between water quality and energy. Heat recovery from blowdown is often worthwhile.

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