1 Correct Mark 75 out of 75 Flag question Question text Are the following statements true or false?



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True

False














Fins are attached to the evaporator coil to facilitate heat ejection to the surrounding.











The lower the ODP and GWP values of a refrigerant, the more harm it does to the environment.











Although carbon dioxide presents almost no environmental risk as a refrigerant, it is no longer used for requiring a too high pressure to emit heat.







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Watch the last part of the lecture and take careful notes of the content. Then use your notes to answer the questions that follow.
Question 20
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What does a compressor do in a refrigeration system?
Select one:
A. It cools the refrigerant so it will absorb heat from inside the refrigerator.
B. It compresses the refrigerant to raise its pressure and temperature. 
C. It drops the refrigerant pressure to help it vaporize more easily.
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Question 21
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What is the role of an expansion valve?
Select one:
A. Raises the refrigerant's temperature
B. Pressurizes the refrigerant
C. Separates the low and high pressure zones 
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Question 22
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After the refrigerant leaves the compressor, where does it go next?
Select one:
A. to the evaporator coils
B. to the receiver
C. to the condenser coils 
D. to the metering device
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Question 23
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What is the state of the refrigerant as it leaves the evaporator?
Select one:
A. low pressure, low temperature mixture of gas and liquid
B. high pressure, high temperature gas
C. high pressure, low temperature liquid
D. low pressure, slightly heated gas 
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