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Question

Difficulty: MediumDirect Fact Retrieval

During scheduled maintenance on naval diesel auxiliary generators, technicians inspect the duplex coalescer-separator assembly. Raw fuel first flows through a micro-glass pre-filter rated at 10 microns to eliminate solid contaminants. The fuel then passes into the coalescer stage, where microscopic water droplets merge into larger globules on Teflon-coated fiberglass media. Because dense water droplets sink to the sump basin, a float-operated sensor triggers an automated drain valve when liquid accumulates to 250 milliliters. The dry fuel subsequently exits through a secondary 2-micron polishing screen before reaching the high-pressure injection pump.

According to the passage, what specific condition triggers the automated drain valve?

  1. A
    The collection of solid contaminants in the 10-micron micro-glass pre-filter
  2. A float-operated sensor detecting 250 milliliters of accumulated liquidAnswer
  3. C
    A secondary polishing screen registering a fluid blockage of 2 microns
  4. D
    A thermal switch detecting elevated fuel temperatures before the injection pump

Answer

A float-operated sensor detecting 250 milliliters of accumulated liquid in the sump basin.
The passage explicitly states that 'a float-operated sensor triggers an automated drain valve when liquid accumulates to 250 milliliters.' The choice describing a float-operated sensor detecting 250 milliliters of accumulated liquid directly reflects this stated fact.

Step-by-Step Solution

1
Scan the passage for keywords related to the question stem, specifically 'triggers' and 'automated drain valve'.
Located the target sentence: 'Because dense water droplets sink to the sump basin, a float-operated sensor triggers an automated drain valve when liquid accumulates to 250 milliliters.'
Direct fact retrieval requires matching key technical terms in the question directly to their explicit mention in the passage.
2
Extract the exact subject and condition associated with the trigger action.
Identified the sensor type ('float-operated sensor') and the quantitative threshold ('liquid accumulates to 250 milliliters').
Verifying both the active component and the specific condition ensures precision against distractors containing near-miss figures or unrelated components.

Key Concept

Direct Fact Retrieval
Estimated Time:1m 0s
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Direct Fact Retrieval

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