Author Question: A refrigeration cycle in which the entire process takes place above the critical point is called a: ... (Read 388 times)

nummyann · **on:** Jul 27, 2018

A refrigeration cycle in which the entire process takes place above the critical point is called a:

A) Sub-critical system. B) Trans-critical system.
C) Super-critical system. D) Non-critical system.

Question 2

What type of refrigerants are normally used in CO2 cascade refrigeration systems?

A) CO2 refrigerant in the high temperature system and HFC refrigerant in the low temperature system
B) HFC refrigerant in the high temperature system and CO2 in the low temperature system
C) CO2 refrigerant in both the high and low temperature systems
D) HFC refrigerant mixed with CO2 in both systems