The blow-off cock in a boiler refers to the :
feed-water treatment
removal of sediments from boiler drum
feed-water pump
discharge of steam from stop valve
removal of sediments from boiler drum
The blow offcock is located at the bottom of the boiler which is used to empty the boiler whenever require and to remove the mud, scale or sediments accumulated at the bottom of the boiler.
Hence, the correct option is (B).
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