$R-22$ has been phased out due to its:

a$)$ carbon content

b$)$ ammonia content

c$)$ chlorine content

d$)$ phosphorus content

The following should be used as a cleaning solvent in an HVAC unit except:

a$)$ steam

b$)$ carbon tetrachloride

c$)$ gasoline

d$)$ kerosene

Which of the following is not a component of an HVAC system?

a$)$ Metering Device

b$)$ Evaporator

c$)$ Compressor

d$)$ Vacuum pump

Which of the following chemical elements is not found in HFC refrigerants?

a$)$ Carbon

b$)$ Hydrogen

c$)$ Fluorine

d$)$ Chlorine

What type of refrigerant contains $50\%R-32$ and $50\%R-125?$

a$)$ R$-600$A

b$)R-407C$

c$)R-410A$

d$)R-134A$

The following are precautions when storing refrigerants, except:

a$)$ limiting the number of people who have access to the refrigerants

b$)$ the temperatures in the storage area must not exceed $52C$

c$)$ ensuring the refrigerant cylinders have no pressure device during storage to avoid explosion

d$)$ the cylinders must be stored in an inverted position

The refrigerant with the chemical composition $CC{l}_2{F}_2$ is

a$)R-12$

b$)R-13$

c$)$ R$-114$

d$)R-143A$