a. Azeotropes b. Expendable refrigerants c. Freezants d. Zeotropes 12. Which widely used CFC refrigerant that is no longer manufactured is stored in white cylinders? a. R-12 b. R-22 c. R-134a d. R-500 13. The ability of a refrigerant to be harmful or lethal with acute or chronic exposure is its _____. a. Coefficient of performance b. Flammability c. Fractionation d. Toxicity 14. A substance’s capacity to ignite and burn is its _____. a. Coefficient of performance b. Flammability c. Fractionation d. Toxicity 15. A ______ visually represent how a refrigerant’s temperature and pressure both rise and fall in direct relation to each other. a. Pressure-temperature chart b. Pressure-enthalpy table c. Pressure- temperature curve d. Material safety data sheet 16. A refrigerant’s thermodynamic properties in a saturated condition are shown only numerically in a ______. a. Pressure-enthalpy diagram b. Pressure-enthalpy table c. Pressure-temperature curve d. Material safety data sheet 17. The EPA established the SNAP program for which purpose? a. To evaluate and regulate substitutes for high ODP refrigerants b. To progress the phase out of older refrigerants c. Work toward meeting the ozone protection provisions of the Clean Air Act d. All of the above 18. How can the refrigerant temperature in air-cooled condenser be estimated? a. By adding 30 o F to 35 o F to the ambient temperature of air around the condenser b. By subtracting 20 o F from the present condenser temperature c. By placing a temperature probe inside the suction line d. None of the above 19. In 2010, the United States stopped manufacturing new units that contain ______, a widely used HCFC refrigerant. a. R-12 b. R-22 c. R-134a d. R-410A 20. Which of the following is not a desirable property for new refrigerants? a. Noncorrosive b. Nonexplosive c. High boiling point d. Stable in gas form 21. Which of the following refrigerants has a low GWP and can be used as a replacement for R-134a in automotive air conditioning? a. R-125 b. R-717 c. R-410A d. R-1234yf 22. The colorless refrigerant often used in large absorption systems that has a distinct odor is _____. |