A refrigerant that is classified as B3 has _____. 

match the refrigerants with the corresponding common use.  A. R-454A  B. R-407C  C. R-508B  D. R-600a  E. R-1233zd 

When refrigeration lubricant is found to be dark black in color, pungent in odor, and containing metal shavings, it is likely that the _____ failed. 

A partially halogenated refrigerant classification with zero ozone depletion potential (ODP) but high global warming potential (GWP) describes _____. 

True or False? Even though some refrigerants, such as R-12, are illegal to manufacture, only technicians who are EPA-certified may purchase small cans of R-12. 

A group of synthetic lubricants compatible with CFCs, HCFCs, and HFCs describes _____ lubricants. 

True or False? Refrigeration lubricants are stable fluids that should be kept in open containers or cylinders that are vented to atmosphere.

Which type of refrigerant has the highest ODP? 

Which of the following statements is true about the graphical method?

What type of matrix is formed when all elements except the main diagonal are zero?