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Which of the following option is incorrect about the sludges?

(a) Sludges are soft, loose and slimy precipitate

(b) They are non-adherent deposits and can be easily removed

(c) Formed generally at heated portions of the boiler

(d) Can be removed by blow down operation

The question was asked in final exam.

The above asked question is from Boiler Feed Water topic in chapter Water and its Treatment of Engineering Chemistry II

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The correct answer is (c) Formed generally at heated portions of the boiler

Explanation: Sludges are formed generally at colder portions of the boiler. All the other options are correct. Sludges are soft, loose and slimy precipitate, non-adherent deposits and can be easily removed by blow down operation.

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