Question 79Steam Plants - Assistant Engineer
70% to passBoiler water hardness is increased by _______________.
Azero alkalinity in the water
Bimproper operation of the DC heater
Cdissolved gases in the water
Dscale forming salts in the feed water
AI Explanation
The correct answer is D) scale forming salts in the feed water. Boiler water hardness is increased by the presence of scale-forming salts, such as calcium and magnesium ions, in the feed water. These dissolved salts can precipitate out and form hard mineral deposits (scale) on the inside of the boiler, which increases the boiler water hardness. The other options are incorrect because zero alkalinity, improper DC heater operation, and dissolved gases do not directly increase boiler water hardness, which is primarily caused by the presence of scale-forming salts in the feed water.
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