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 mixed with CO2 in both systems
C) HFC refrigerant in the high-temperature system and CO2 in the low-temperature system
D) CO2 refrigerant in both the high- and low-temperature systems
C
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On an induced draft furnace, a draft switch that will not close will
A) Cause the induced draft blower to operate continuously, even with no heating call B) Will prevent the igniter from energizing C) Prevent the indoor blower from operating D) Prevent the combustion blower from operating
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