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Difficulty: EasyDistinguishing Supported and Unsupported Inferences

Pneumatic tools in maintenance workshops operate using compressed air delivered through high-pressure hoses. However, ambient air drawn into the compressor contains water vapor that condenses into liquid inside the supply lines. When liquid water reaches the internal mechanisms of air-powered ratchets and wrenches, it washes away protective lubricants and accelerates metal corrosion, leading to tool seizure. To prevent premature equipment failure, maintenance facilities install inline moisture filters that extract condensed water before air reaches the tools.

Based on the passage, which of the following conclusions is directly supported by the text?

  1. A
    Technicians must manually apply oil to pneumatic tools before every work shift.
  2. Water inside supply lines impairs the protective lubrication of air-powered tools.Answer
  3. C
    Inline moisture filters cause tools to seize by condensing ambient air inside the compressor.
  4. D
    Pneumatic impact wrenches suffer higher failure rates than any other shop equipment.

Answer

Water inside supply lines impairs the protective lubrication of air-powered tools.
The passage clearly explains that when moisture travels through the lines into the tools, it 'washes away protective lubricants.' Therefore, the inference that water impairs the lubrication of air-powered tools is directly supported by textual evidence.

Step-by-Step Solution

1
Analyze the passage for stated facts regarding water in supply lines and tool mechanisms.
The text explicitly states that condensed water reaching internal tool mechanisms 'washes away protective lubricants and accelerates metal corrosion.'
Identifying explicit statements allows evaluation of whether an inference is logically grounded in text evidence.
2
Compare each option against the textual evidence to distinguish supported statements from unsupported assumptions or external additions.
The conclusion that water in supply lines impairs lubrication is a direct paraphrase of the text, while other choices introduce unstated comparisons, reversed causality, or outside procedures.
A supported inference must be justifiable entirely through the provided passage without extrapolating unmentioned facts.

Key Concept

Distinguishing Supported and Unsupported Inferences
Estimated Time:50s
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Topics

Distinguishing Supported and Unsupported Inferences

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