Hvacr unit 3 Study guides, Class notes & Summaries
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Nate Core Exam Questions With Correct Answers
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©THEBRIGHTSTARS 2024/2025 
Nate Core Exam Questions With Correct 
Answers 
What are the five basic components to any schematic? - answer1. 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? - answer1. The 
lad...
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HVAC NATE Heat Pump- Exam 2023 Questions and Answers
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On an R-22 system, line diameters and lengths are typically specified for a vapor pressure drop that does not exceed what? - ANSWER-6-7PSI or 6F 
 
What is the primary purpose of using flux when soldering copper or brass parts? - ANSWER-Prevent Oxidation 
 
The water that results from a defrost cycle of an air to air heat pump(runoff) must? - ANSWER-Drain off and away from the outdoor coil. 
 
Why must the runoff be drained off and away from the outdoor coil? - ANSWER-Excessive ice can build up ...
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HVACR Unit 13 – Compressors Questions and Answers
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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...
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NATE CORE-Exam 2023 Questions and Answers
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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 ...
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Unit 23 Test and Quiz Review Questions and Answers
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Unit 23 Test and Quiz Review Questions and Answers 
The compressor increases the pressure in the system from the low-side pressure to the high-side pressure. 
Which of the following best describes the function of a compressor? 
 
The compressor restricts the flow of refrigerant that enters the evaporator. 
The compressor pumps liquid refrigerant into the condenser to transfer heat. 
The compressor is used to throttle a thermostatic expansion valve (TXV) open or closed. 
The compressor increases ...
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EPA 608 Core Test Sample Questions With Correct Answers
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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 ...
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EPA 608 Guaranteed Success
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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...
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Fundamentals of HVACR Second Edition | Answers to End of Unit Questions | Latest exam Questions with Correct Answers
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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 ...
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Nate core exam 2022| 160 QUESTIONS| WITH COMPLETE SOLUTIONS
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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...
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EPA 608 Core Test Sample Questions & Verified Answers!!
- Exam (elaborations) • 53 pages • 2023
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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 ...
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