Q15
Air refrigeration cycle is used in
A.
Domestic refrigerators
B.
Commercial refrigerators
C.
Air conditioning
D.
Gas liquefaction
AnswerAnswer: Option D
Solution
Answer: Option D
Solution:
The processes are used for scientific, industrial and commercial purposes. Many gases can be put into a liquid state at normal atmospheric pressure by simple cooling; a few, such as carbon dioxide, require pressurization as well.At ambient pressure the boiling point of liquefied helium is 4.22 K