When a system has its pressure reduced to about 50 to 250 microns it is said to
ID: 2080016 • Letter: W
Question
When a system has its pressure reduced to about 50 to 250 microns it is said to be: a. Partially evacuated. b. In a semi-vacuum. c. In a deep vacuum. d. Recovered. e. Reclaimed. Multiple evacuation: a. When you had evacuated 3 different units b. Is when the same refrigeration system is evacuated three times. c. Uses refrigerant or nitrogen to break the vacuum between evacuations. d. Both b and c are correct. e. None of the above. What is the roost effective method for leak detection: a. The standing vacuum test. b. The standing pressure test. c. Ultraviolet leak detection method. d. Pressurizing the system with a trace amount of R-22 and/or nitrogen and leak testing. e. None of the above. Moisture and non-condensables in a system arc removed: a. By using a vacuum pump. b. By flushing the system with liquid refrigerant. c. By the standing vacuum method of evacuation. d. By applying heat to the system while evacuating. e. None of the above. It will help to remove moisture from a system by: a. Using the triple evacuation method. b. Warming the system while evacuating. c. Leaving the unit in a standing vacuum overnight. d. Both a, and b are correct. e. All of the above. To prevent excess moisture from passing through your vacuum pump and possible mining the pump: a. Use a cold trap. b. Use a moisture dyer. c. Heat the vacuum pump. d. Heat the refrigeration system.. e. None of the above.Explanation / Answer
17. (C) In The deep vacuum method involves reducing the pressure of the system to 50 to 250 microns.
18. (D) Both B and C are correct.
19 (C) ultraviolet leak detection method
20. (A) By using vacuum pump.
Using a vacuum pump and micron gauge, evacuate the system to a minimum of 300 microns to remove moisture, or noncondensable.
21. (D)
22. (A)
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