Hvacr unit 2 - Study guides, Class notes & Summaries

HVACR Unit 13 – Compressors Questions and Answers List the major types of compressors by mechanical design. Rotary, reciprocating, scroll, screw, centrifugal Explain the difference between a positive-displacement compressor and nonpositive-displacement compressor. Positive displacement - refrigerant is replaced with physical unit like a piston to increase pressure and temperature. Non-positive displacement - the refrigerant is not replaced; it is thrown outward where centrifugal for...

EPA 608 CORE QUESTIONS AND ANSWERS 2023 what is CFCs? Chlorofluorocarbons (Chlorine, Fluorine, and carbon) What is HCFCs? Hydrochlorofluorocarbons (hydrogen, chlorine, fluorine, and carbon) What is ASHRAEs? The American Society of Heating Refrigerating and Airconditioning Engineers. A global professional association seeking to advance heating, ventilation, airconditioning and refrigeration systems. What is the greatest effect in the stratosphere? The greatest effect in ...

NATE Exam: Core Essentials, questions and answers. Verified d (very important) The ability to utilize all types of communication skills is ____ to the HVACR technician. a. not as important as "hands-on" technical skills b. somewhat important c. unimportant d. very important d (all of the above: clear, complete, concise) It is important to be ____ in filling out service orders so that office staff, other technicians, and customers will know what work you completed on the job. ...

EPA SECTION 608 CORE (2022 revision) What does ozone in the stratosphere above the earth consist of? a. Molecules containing 2 oxygen atoms. b. Molecules containing 3 oxygen atoms. c. Molecules containing 4 oxygen atoms. d. Molecules containing 5 oxygen atoms Which of the following refrigerants has the lowest global warming potential? a. R-134a b. R-407C c. R-410A d. R-600a Which of the following gases is used as the baseline measurement for global warming potential? a. Ammo...

When explaining to a customer that you have topped off the system charge, which of the following terms is most appropriate? - ANSWER-Refrigerant It is important to be _____ in filling out service orders so that office staff, other technicians, and customers will know what work you completed on the job. - ANSWER-All of the above (clear, complete, concise) The ability to utilize all types of communication skills is _____ to the HVACR technician - ANSWER-Very important Listening carefully ...

HVACR UNIT 55 Exam Questions and Correct Answers (100%) ||Graded A+ || Verified Latest 2024!!! A major difference between the operation of an oil furnace and a gas furnace is that: - The oil must be atomized before ignition. An oil furnace heat exchanger is built: - Like a drum. How are oil burner nozzles rated? - Cone shape, spray angle, and GPH Modern residential oil furnaces sense the flames using: - A cadmium sulfide cell. Sealed combustion oil furnaces use: - High static oil burners...

As of what date did it become unlawful to release Class 1 and Class II refrigerants to the atmosphere? a. July 1, 1992 b. July 1, 1993 c. November 14, 1994 d. January 1, 1996 - Answer a. July 1, 1992 What is the ozone layer and why is it important to us on Earth? a. Thin layer of R-22 in the atmosphere that filters UV. b. Protective shield for Earth from the sun's harmful ultraviolent (UV) rays in the stratosphere layer that extends about 6 to 30 miles above earth c. Thin layer of ...

EPA 608 Guaranteed Success 1. Definition of Reclaiming: - To process refrigerant to a level equal to new (virgin) product specifications as determined by chemical analysis defines: ️ Reclaiming. 2. Disposable Cylinder Disposal Method: - The proper disposal method for disposable cylinders is to ️ recover any remaining refrigerant and then render the cylinder useless, then recycle the metal. 3. Definition of Recycling: - Clean refrigerant for reuse by separating the oil from the refr...

UNIT 1 REVIEW QUESTIONS ANSWER KEY 1-1) List some of the different ways that homes and buildings may be heated. Wood, gas, oil, electric, solar, heat pumps, and geothermal heating systems are used. 1-2) What were some of the primary heating fuels that early civilizations used? Wood, peat, and coal remained the primary heating fuels for centuries. 1-3) When is it believed that ice was first artificially made for food storage? First evidence of man making ice appeared more than 3,000 years ...

What are the five basic components to any schematic? Correct Answer: 1. A power supply 2. A path for the power 3. A load or component that operates from the power. 4. A switch or component that interrupts the power to the load. 5. A legend or key that explains what the various symbols and abbreviations used in the schematic mean. What are the three basic types of wiring diagrams used in the HVACR trade? Correct Answer: 1. The ladder diagram 2. The pictorial diagram 3. The installation...