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Difficulty: EasyParaphrased Fact Recognition

In industrial powder coating, technicians apply dry, finely ground polymer particles to conductive metal parts using an electrostatic spray gun. The nozzle imparts a negative electrical charge to the powder particles as they are propelled toward the grounded workpiece. Because opposite electrical charges attract, the charged powder clings evenly to the component's exterior surface, even adhering to recessed crevices. After this deposition process, the coated part is placed in a curing oven where elevated temperatures melt the powder into a uniform, durable protective layer. This electrostatic technique minimizes overspray waste compared to conventional liquid painting.

According to the passage, which of the following explains why the dry powder adheres uniformly to the metal component?

  1. A
    Elevated temperatures melt the powder particles as they leave the spray gun nozzle.
  2. Opposing electrical polarities cause the coating material to bond evenly across the surface.Answer
  3. C
    The formation of a durable protective layer creates a negative charge on the component.
  4. D
    Chemical solvents evaporate rapidly to leave behind an evenly distributed polymer film.

Answer

Opposing electrical polarities cause the coating material to bond evenly across the surface.
The passage directly notes that the negatively charged powder clings evenly to the grounded workpiece because opposite electrical charges attract. The correct answer restates this exact factual relationship using synonymous phrasing ('opposing electrical polarities' for 'opposite electrical charges' and 'bond evenly' for 'clings evenly').

Step-by-Step Solution

1
Identify the target question focus
The question asks for the specific reason the powder adheres evenly to the metal part.
Direct retrieval of the factual cause stated in the text is required.
2
Locate the relevant factual detail in the text
The passage states: 'Because opposite electrical charges attract, the charged powder clings evenly to the component's exterior surface...'
This sentence directly addresses the physical mechanism behind adhesion.
3
Match the fact to its paraphrased equivalent while avoiding verbatim traps
The statement that opposing electrical polarities cause the coating material to bond evenly across the surface accurately restates the source sentence using synonymous phrasing.
Paraphrased fact recognition requires identifying true meaning without relying on verbatim word matching.

Key Concept

Paraphrased Fact Recognition
Estimated Time:45s
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Paraphrased Fact Recognition

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