Examkin

Question

Difficulty: MediumParaphrased Fact Recognition

Modern commercial refrigeration systems rely on scroll compressors rather than traditional reciprocating pistons to circulate refrigerant vapor. Because scroll compressors contain fewer moving parts and operate in a continuous orbital motion, they produce significantly less mechanical vibration during operation. This reduction in vibration minimizes strain on brazed copper joints throughout the refrigeration lines, thereby decreasing the frequency of refrigerant leaks over the equipment's operational lifespan. However, technicians must ensure that lubricant levels are checked prior to seasonal restarts, as running a dry orbital scroll will cause irreversible internal friction damage within minutes.

According to the passage, why do scroll compressors reduce the occurrence of refrigerant leaks over time?

  1. A
    They eliminate refrigerant vapor by maintaining continuous orbital motion.
  2. Their diminished mechanical oscillation places less physical stress on tubing connections.Answer
  3. C
    Frequent refrigerant leaks gradually reduce the mechanical vibration produced by reciprocating pistons.
  4. D
    Technicians inspect the brazed copper joints exclusively during seasonal restarts to detect friction damage.

Answer

Scroll compressors reduce refrigerant leaks because their diminished mechanical oscillation places less physical stress on tubing connections.
The passage states that reduced mechanical vibration minimizes strain on brazed copper joints, which directly decreases the frequency of refrigerant leaks over time. The correct response accurately conveys this causal fact using synonyms: 'diminished mechanical oscillation' for 'reduction in vibration' and 'less physical stress on tubing connections' for 'minimizes strain on brazed copper joints'.

Step-by-Step Solution

1
Locate the portion of the text that addresses the cause of reduced refrigerant leaks.
The third sentence states: 'This reduction in vibration minimizes strain on brazed copper joints throughout the refrigeration lines, thereby decreasing the frequency of refrigerant leaks...'
Direct factual retrieval requires identifying the specific sentence explaining the target mechanism.
2
Analyze the core cause-and-effect relationship in that sentence.
Cause: Less vibration -> Result: Less strain on joints -> Final Outcome: Fewer refrigerant leaks over time.
Isolating the underlying relationship ensures the paraphrase preserves the logical meaning.
3
Match the identified relationship with its synonymous restatement among the choices.
'Diminished mechanical oscillation' matches 'reduction in vibration', and 'less physical stress on tubing connections' matches 'minimizes strain on brazed copper joints'.
Paraphrased fact recognition requires mapping original phrasing to accurate semantic equivalents rather than verbatim surface words.

Key Concept

Paraphrased Fact Recognition
Estimated Time:1m 0s
Rate this question

Topics

Paraphrased Fact Recognition

More questions from this topic