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Sagot :
Answer:
The correct option is:
c. a liquid line
**Simple Explanation:**
Excessive noise in a refrigeration system is typically caused by mechanical components that are in motion or under pressure. Here's a brief explanation of each option:
- **a. a compressor:** Compressors can generate noise due to their mechanical operation and vibrations.
- **b. an electric motor:** Motors powering components like compressors or fans can produce noise, especially if they are worn or improperly lubricated.
- **c. a liquid line:** The liquid line in a refrigeration system carries refrigerant liquid, which is under pressure but generally does not cause excessive noise.
- **d. mounting hardware of a condensing unit:** Loose or improperly secured mounting hardware can vibrate and produce noise as the condensing unit operates.
Therefore, option **c**, the liquid line, is the correct answer because it typically does not contribute significantly to excessive noise in a refrigeration system.
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