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Consider the following statements:
1. Practically all common refrigerants have approximately the same COP and power requirement.
2. Ammonia mixes freely with lubricating oil and this helps lubrication of compressors.
3. Dielectric strength of refrigerants is an important property in hermetically sealed compressor units.
4. Leakage of ammonia can be detected by' halide torch method.  Of these statements:  
  • a)
    1, 2 and 4 are correct
  • b)
    2 and 4 are correct
  • c)
    1, 3 and 4 are correct
  • d)
    1 and 3 are correct 
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
Consider the following statements:1. Practically all common refrigeran...
Practically all refrigerants, except CO2 have fairly same COP and power requirements. Thus statement (a) is correct. Ammonia does not mix freely with lubricating oil. Therefore statement (b) is wrong. Dielectric strength of refrigerants is an important property in hermetically sealed compressor units. Leakage of ammonia is detected by its odour or sulphur candle with which ammonia forms white smoke like fumes. Thus statements 1 and 4 are correct and choice (d) is the right choice. 
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Most Upvoted Answer
Consider the following statements:1. Practically all common refrigeran...


1. COP and Power Requirement of Common Refrigerants
- Statement 1 is incorrect because different refrigerants have different COP (Coefficient of Performance) and power requirements.
- The COP and power requirement can vary based on the type of refrigerant used, its properties, and the specific application.

2. Ammonia and Lubricating Oil
- Statement 2 is correct. Ammonia does mix freely with lubricating oil, which can help in the lubrication of compressors.
- This property makes ammonia a suitable refrigerant for systems where lubrication of compressors is crucial.

3. Dielectric Strength of Refrigerants
- Statement 3 is incorrect. The dielectric strength of refrigerants is not typically a key property in hermetically sealed compressor units.
- Dielectric strength is more relevant in applications where electrical insulation is critical.

4. Leakage Detection of Ammonia
- Statement 4 is correct. Ammonia leakage can be detected using the halide torch method.
- This method involves using a halide torch to detect the presence of ammonia by observing a greenish-blue flame when the torch is brought near the leaking ammonia.

In conclusion, statements 2 and 4 are correct while statements 1 and 3 are incorrect based on the properties and characteristics of refrigerants.
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Consider the following statements:1. Practically all common refrigerants have approximately the same COP and power requirement.2. Ammonia mixes freely with lubricating oil and this helps lubrication of compressors.3. Dielectric strength of refrigerants is an important property in hermetically sealed compressor units.4. Leakage of ammonia can be detected by' halide torch method. Of these statements: a)1, 2 and 4 are correctb)2 and 4 are correctc)1, 3 and 4 are correctd)1 and 3 are correctCorrect answer is option 'D'. Can you explain this answer?
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