Hvacr unit 12 exam Study guides, Class notes & Summaries

HVACR UNIT 12 EXAM LATEST UPDATE...

HVACR UNIT 12 EXAM QUESTIONS AND ANSWERS #10.

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 ...

HVACR UNIT 14 EXAM QUESTIONS AND ANSWERS #12

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...

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...

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...

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 ...