410A


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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