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Question

Difficulty: MediumDirect Fact Retrieval

Shipboard Halon 1301 total flooding systems are designed to extinguish engine room fires rapidly while allowing personnel time to evacuate. When the manual pull station is activated, pneumatic actuators release nitrogen pilot gas, which triggers a pneumatic 30-second time-delay mechanism before opening the main Halon storage cylinder valves. This delay allows ventilation dampers to close automatically and audible evacuation alarms to sound. An emergency bypass valve is installed parallel to the time delay; opening this bypass valve overrides the countdown and discharges the Halon agent immediately into the protected space.

According to the passage, what specific action immediately discharges the Halon agent without waiting for the time delay?

  1. A
    Activating the manual pull station
  2. Opening the emergency bypass valveAnswer
  3. C
    Waiting for the thirty-second countdown to expire
  4. D
    Closing the engine room ventilation dampers

Answer

Opening the emergency bypass valve overrides the countdown and immediately discharges the Halon extinguishing agent.
The passage explicitly states that opening the emergency bypass valve overrides the countdown and discharges the Halon agent immediately into the protected space.

Step-by-Step Solution

1
Identify the key requirement in the question stem
The question asks for the specific action that causes an immediate discharge of Halon without waiting for the delay.
Clarifying the specific factual condition prevents confusion with standard activation procedures.
2
Scan the passage for explicit statements regarding immediate discharge or overriding the delay
The final sentence states: 'An emergency bypass valve is installed parallel to the time delay; opening this bypass valve overrides the countdown and discharges the Halon agent immediately into the protected space.'
Direct fact retrieval requires matching the stated condition directly with the author's explicit words.
3
Match the identified fact with the corresponding answer choice
Opening the emergency bypass valve directly matches the passage text.
Eliminating options that describe standard activation or automated side effects confirms the unambiguous correct answer.

Key Concept

Direct factual extraction from technical text based strictly on explicit stated statements
Estimated Time:45s
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Topics

Direct Fact Retrieval

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