Hvacr unit 12 final exam - Study guides, Class notes & Summaries
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HVACR UNIT 12 Final Exam 2023/2024.
- Exam (elaborations) • 3 pages • 2024
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HVACR UNIT 12 Final Exam 2023/2024. 
A compressor that squeezes gas between the piston and a valve plate at the top of the cylinder is called a: - ANSWER Reciprocating compressor. 
 
A compressor that squeezes gas between two rotating screws shaped like augers is called a: - ANSWER Screw compressor. 
 
A compressor that uses a high-speed impeller to throw the refrigerant outwards is called a: - ANSWER Centrifugal compressor. 
 
A compressor that uses a roller that rotates in an orbital motion...
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(Answered) EPA SECTION 608 CORE (2021-2022 revision)
- Exam (elaborations) • 20 pages • 2022
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EPA SECTION 608 CORE (2021-2022 revision) 
A disposable cylinder should be reduced to what pressure before scrapping? 
a. 0 psig 
b. 20 psig 
c. 50 psig 
d. 80 psig 
 
A major system repair is being performed on a R-22 appliance. What CANNOT be done to recharge the appliance? 
a. Add R-22 after the repair is complete. 
b. Retrofit the unit to R-407C. 
c. Use recovered or recycled R-22 from the same 
owner. 
d. Top off the unit with R-410a. 
A refillable cylinder must not be filled above what ...
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EPA 609 Certification Questions & Answers Accurate 100%
- Exam (elaborations) • 27 pages • 2023
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An ----- should be taken and ----- if a system has a major component failure. - Answer oil sample 
analyzed 
 
(evacuation) The system vacuum gauge should be connected ----- from the vacuum pump. - Answer far as possible 
 
To receive any certification, which section must be passed? - Answer Section A (core) 
 
Always review the -----, when working with any solvents, chemicals, or refrigerants - Answer material safety data sheets 
 
Cylinders should be transported in an ----- position - Answer u...
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EPA SECTION 608 CORE (2022 revision)
- Exam (elaborations) • 20 pages • 2022
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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...
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