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HVAC Final Exam: Unit 9 2024-2025 Questions and Answers, Exams of Refrigeration and Air Conditioning
A study guide or exam preparation material for an hvac (heating, ventilation, and air conditioning) final exam covering unit 9 content. It includes a series of questions and their corresponding answers, covering topics such as refrigerant fractionation, epa certifications, replacement refrigerants, ozone layer protection, and hvac system components. The level of detail and technical terminology suggests this document is intended for students or professionals in the hvac field, likely at the university or vocational level. The comprehensive coverage of hvac-related concepts and the focus on exam preparation make this document potentially useful as study notes, lecture notes, or a summary for students preparing for an hvac final exam or certification.
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HVAC Final Exam, Unit 9 2024-
2025. Questions & Correct
Answers. Graded A+
Define "fractionation". - ANSOccurs when the refrigerant is being changed from a liquid to a vapor Equipment manufactures design recovery equipment to be able to recover refrigerant at what rate? - ANS2-6 lb/min How are near- azeotropic blends identified? - ANSR-400 Series Most refrigerants are made up of two molecules,_______and______. These molecules contain hydrogen (H) and carbon (C) - ANSMethane and Ethane On what does a type 11 EPA certification allow a service technician to work? - ANSHigh pressure Systems On what does type 1 EPA certification allow a service technician to work? - ANSSmall appliances (Residential) On what does type 111 EPA certification allow a service technician to work? - ANSCommercial and Chillers On what does universal EPA certification allow a service technician to work? - ANSOn everything. Small, medium, and large
appliances What interim replacement refrigerants for R-11 is used in low pressure centrifugal systems? - ANSR-123 What is the difference between an azeotropic mixture and a near- azeotropic mixture? - ANSAzeotropic: Has one boiling point, does not have fractionation, and includes R-500 and R- refrigerants. Near azeotropic: Has more than one boiling point, fractionation does occur, and experiences temperature glides. What is tropospheric ozone and why are we not concerned with protecting it? - ANSConsidered the bad part of the ozone layer. Basically contains pollutants What new refrigerant is replacing R-410a? - ANSR-32 What oil should I use for R-407c? Tell me what you know about this gas? - ANSIt is an R- retrofit refrigerant blend for medium and low temp. Uses POE oil When did it become illegal to "intentionally" vent CFC refrigerants to the atmosphere? Give the month, day, and year.
- ANSJuly 1, 1992 When did it become illegal to "intentionally" vent HFC refrigerants to the atmosphere? Give the month, day, and year. - ANSNovember 15, 1995 Where would you find dual
pressure relief valves installed in parallel? - ANSLow pressure systems Why is stratosphere ozone so important to our environment? - ANSProtects us from the harmful UV rays that the sun emits.