Discussion
Which device removes moisture from an air brake system?
Answer: B
A desiccant cartridge adsorbs water from the compressed air and is purged periodically, which protects the valves from freezing. Reservoir drains are the older manual method and are still present, which makes the second option a reasonable near miss. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. Tracing the requirement back to the physical constraint that produces it makes the answer follow. Most errors here come from carrying a result across from a neighbouring case where it does not hold.
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