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.
Information
Flag question
Information text
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 Correct
Mark 0.25 out of 0.25
Flag question
Question text
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.
Feedback
Your answer is correct.
Question 21 Correct
Mark 0.25 out of 0.25
Flag question
Question text
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
Feedback
Your answer is correct.
Question 22 Correct
Mark 0.25 out of 0.25
Flag question
Question text
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
Feedback
Your answer is correct.
Question 23 Correct
Mark 0.25 out of 0.25
Flag question
Question text
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
Feedback
Your answer is correct.
