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Difficulty: MediumQuantitative Detail Extraction

During routine operational readiness testing of the shipboard Halon 1301 fire extinguishing system in main machinery spaces, technicians must monitor discharge timing and pressure thresholds. The system requires a 60-second primary system diagnostic check prior to manual arming. When activated, a 30-second pre-discharge alarm sounds to permit personnel evacuation before the agent releases. The total flooding concentration must achieve full dispersion within 10 seconds of discharge initiation. After activation, the compartment must remain sealed for at least 15 minutes to prevent fire reflash.

According to the passage, how long does the pre-discharge alarm sound to allow personnel to evacuate?

  1. A
    10 seconds
  2. 30 secondsAnswer
  3. C
    60 seconds
  4. D
    15 minutes

Answer

30 seconds
The passage directly states that a 30-second pre-discharge alarm sounds when the system is activated to allow personnel time to evacuate before the extinguishing agent releases.

Step-by-Step Solution

1
Identify the target quantity requested in the stem
The target quantity is the duration of the pre-discharge evacuation alarm.
Clarifying the specific measurement needed prevents confusion with other numbers in the passage.
2
Scan the passage for the sentence detailing the pre-discharge alarm
The text states: 'When activated, a 30-second pre-discharge alarm sounds to permit personnel evacuation before the agent releases.'
Locating the exact sentence links the correct numerical value with the specified event.
3
Extract the corresponding time value and confirm against alternative figures
The duration is 30 seconds, distinguishing it from 60 seconds (diagnostic check), 10 seconds (dispersion time), and 15 minutes (sealing duration).
Eliminating surrounding quantitative data confirms the exact match.

Key Concept

Extracting specific numerical values and time durations associated with distinct operational stages in technical text
Estimated Time:1m 0s
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Topics

Quantitative Detail Extraction

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