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Difficulty: EasyDistinguishing Supported and Unsupported Inferences

During shipboard welding operations, safety regulations mandate the assignment of a designated fire watch. The fire watch is responsible for monitoring the work area and adjacent compartments for stray sparks or smoldering debris during hot work and for at least thirty minutes after welding ceases. Because heat can readily conduct through metal bulkheads and ignite combustible materials on the opposite side, the fire watch must ensure that flammable items in neighboring spaces are cleared prior to starting. Even if the welder considers the task complete, the area cannot be left unattended until the mandatory monitoring window has elapsed.

Which of the following conclusions is most directly supported by the passage?

  1. A
    Heat conducting through metal bulkheads will always ignite materials in adjacent compartments.
  2. Potential fire hazards can persist even after active welding has ended.Answer
  3. C
    Welders are prohibited from performing hot work unless a certified municipal firefighter is present.
  4. D
    Shipboard welding fires must be extinguished exclusively using pressurized chemical foam.

Answer

Potential fire hazards can persist even after active welding has ended.
The conclusion that potential fire hazards can persist even after active welding has ended is valid because the passage explicitly states that smoldering debris and conducted heat can cause ignition, requiring continuous watch for at least thirty minutes after welding ceases.

Step-by-Step Solution

1
Analyze the passage for stated facts regarding post-welding conditions.
The text explicitly requires monitoring for sparks and smoldering debris for at least thirty minutes after welding stops.
Identifying the textual basis for post-operation procedures reveals the underlying reason for safety monitoring.
2
Evaluate the logical implication of the mandatory thirty-minute post-welding monitoring period.
The requirement demonstrates that the danger of ignition remains active even after welding equipment is turned off.
A valid inference must be a direct, logical consequence of the evidence presented in the text.
3
Compare candidate conclusions against the text to eliminate unsupported assumptions or extreme language.
The conclusion that fire hazards can persist after active welding ends is strictly supported without exaggeration.
Supported inferences remain within the scope of the passage, whereas unsupported inferences introduce extreme qualifiers or external facts.

Key Concept

Distinguishing between a logically supported inference and an unsupported assumption based strictly on passage evidence.
Estimated Time:45s
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Distinguishing Supported and Unsupported Inferences

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