A malfunction in the DC heater is indicated by __________.
Official USCG Answer & Rule Citation
Correct Answer: Option C — the boiler requiring excessive amounts of oxygen scavenging chemicals
A malfunctioning direct-contact deaerating feed tank fails to strip dissolved oxygen effectively, immediately forcing operators to feed excessive oxygen-scavenging chemicals into the boilers to protect economizers and generating tubes from rapid pitting and oxygen corrosion attack per marine engineering practices.
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