1. When charging a R-410A system that uses a capillary tube or fixed metering device, proper charge can be determined by measuring:

2. To avoid fractionation, blended refrigerants:

3. R-410A systems use a high pressure switch that will open at approximately:

4. Both suction and discharge pressures of R-410A systems are _______ than R-22 systems:

5. When calculating superheat with R-407C:

6. Manifold low side gauge for R-410A refrigerant must range to:

7. When charging an operating R-410A system with liquid refrigerant:

8. The flow of a R-410A metering device is:

9. Compression ratio is calculated as:

10. R-410A:

11. Because of its higher vapor heat capacity, the discharge temperature of R-410A is________ than R-22.

12. If a R-410A system develops a leak:

13. Which of the following is true of R-407C:

14. Systems containing R-410A use __________lubricant.

15. The temperature glide for R-410a is less than____________degrees Fahrenheit over air conditioning and refrigerating operating ranges.

16. When calculating subcooling with R-407C:

17. Service hoses used with R-410A equipment must be rated to:

18. Near-azeotropic blend fractionation may:

19. The cylinder color for R-410A is:

20. Compressor internal pressure relief (IPR) settings for R-410A systems are:

21. A true azeotropic blend:

22. Which of the following statements is true of R-407C

23. When charging a R-410A system that uses a thermostatic expansion valve, proper charge can be determined by measuring.

24. To remove moisture from polyol ester (POE) lubricant:

25. A system using R-410A refrigerant has bubbles in the sight glass. Technician A says
that the system must be low on refrigerant. Technician B says that the bubbles could
be caused by the blended refrigerant flashing in the increased volume of the sight glass. Who is correct?

26. If a large leak of refrigerant occurs in an enclosed area you should:

27. The evaporator or indoor coil should be _______ when changing out existing R-22 equipment to a new R-410A system.

28. R-410A cylinders should not be allowed to get warmer than:

29. Temperature glide refers to:

30. A leak detector capable of sensing________ is needed when working with R-410A:

31. Before working on any electrical circuit:

32. Manifold high side gauge for R410A refrigerant must range to:

33. Blends that have fractionated, depending on the constituent make-up may become:

34. R-410a is also known as:

35. When a blend is zeotropic, or near azeotropic (NARM):

36. The closer a blend comes to being a true azeotrope:

37. Recovery cylinders used with R-410A must have a DOT Rating of:

38. Which of the following is true of R-407C:

39. Polyol Ester (POE):

40. The low pressure control on a R-410A system will open at:

41. When handling refrigerants, technicians should:

42. When a blend is zeotropic, or near azeotropic (NARM):

43. When installing a liquid line filter drier on a R-410A system, be certain that it has a pressure rating of at least:

44. Subcooled liquid in the receiver may ________ subcooling, depending on surrounding conditions:

45. A full nitrogen cylinder has a pressure of approximately:

46. Cylinders containing R-410A that are equipped with dip tubes:

47. Nitrogen cylinders should only be moved:

48. All service equipment used with R-410A:

49. HCFC R-22 is scheduled for total phaseout by the year:

50. Manufacturers of equipment using R-410A have redesigned their compressors:

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