Information on High Pressure Practice Test 1
This is the first of four in our series of free practice tests on handling refrigerants in high-pressure appliances and servicing high-pressure refrigeration equipment. Our practice tests are among the best mobile-friendly tests on the web and render great on phones and tablets for students and apprentices on the go. Please consider sharing them with others that may find them useful, individually or in forums. Thanks… NT.
* NOTE: Having a pressure-temperature reference for commonly used refrigerants is required to answer some of the questions on our practice tests unless you have an amazing memory.
- This practice test is free. Take it as often as you like.
- Contains 25 questions.
- Pressing the submit button immediately returns your resulting score.
- Passing score is 70%. (18 out of 25)
- Correct answer information is provided for questions answered incorrectly.
- Good luck!
| Trade Category: | HVACR |
| Test Category: | EPA 608 Certification |
| Test Subject: | Type II (High-Pressure / Very High-Pressure) |
| Test Number: | 1 of 4 |
| Questions on Test: | 25 |
| Passing Score: | 70% |
#1. Heat pumps that use R-410A should be leak checked with
Correct answer is C: pressurized nitrogen.
Heat pumps that use R-410A should be leak checked with pressurized nitrogen.
#2. Heat pumps that have been retrofitted from R-22 to R-407C should be leak checked with
Correct answer is C: pressurized nitrogen.
Heat pumps that have been retrofitted from R-22 to R-407C should be leak checked with pressurized nitrogen.
#3. To change the compressor on a system containing R-410A, you must isolate the compressor and then
Correct answer is B: evacuate the isolated section of the system to atmospheric pressure and hold. If the system pressure does not rise, remove the compressor.
To change the compressor on a system containing R-410A, you must isolate the compressor and then evacuate the isolated section of the system to atmospheric pressure and hold. If the system pressure does not rise, remove the compressor.
#4. The method to charge a system that has a normal charge of 80 pounds is to charge with
Correct answer is D: liquid through the liquid line service valve.
The method to charge a system that has a normal charge of 80 pounds is to charge with liquid through the liquid line service valve.
#5. After installation of a field-piped R-410A split heat pump, the unit should first be
Correct answer is D: pressurized with nitrogen, then leak checked.
After installation of a field-piped R-410A split heat pump, the unit should first be pressurized with nitrogen, then leak checked.
#6. Pressure relief valves must not be
Correct answer is A: installed in series.
Pressure relief valves must not be installed in series.
#7. When charging an R-12 refrigeration system that uses a water-cooled condenser, you must first charge with vapor to a pressure of at least _____ before switching to liquid charging.
Correct answer is C: 35 psig
When charging an R-12 refrigeration system that uses a water-cooled condenser, you must first charge with vapor to a pressure of at least 35 psig before switching to liquid charging.
#8. Your recovery/recycling machine has R-22 refrigerant in it. You now have to recover refrigerant from a unit with R-410A. What must be done before your recovery unit can be used to recover R-410A?
Correct answer is D: All of the above.
Your recovery/recycling machine has R-22 refrigerant in it. You now have to recover refrigerant from a unit with R-410A. You have to comply with the following before your recovery unit can be used to recover R-410:
- The recovery unit must be EPA-certified for use with R-410A.
- The recovery tank must be designed for the pressure of R-410A.
- The filter and lubricant in the recovery unit must be changed and the recovery unit evacuated.
#9. After reaching the required recovery vacuum on a system you must
Correct answer is D: wait to see if the system pressure rises indicating that there is still refrigerant in liquid form or refrigerant trapped in the oil.
After reaching the required recovery vacuum on a system you must wait to see if the system pressure rises indicating that there is still refrigerant in liquid form or refrigerant trapped in the oil.
#10. In a refrigeration system, the component directly following the evaporator is the
Correct answer is C: accumulator.
In a refrigeration system, the component directly following the evaporator is the accumulator.
#11. A reciprocating compressor should not be energized while
Correct answer is A: the discharge service valve is closed.
A reciprocating compressor should not be energized while the discharge service valve is closed.
#12. R-410A requires a high-pressure manifold gauge and hose set. They must have a
Correct answer is D: 4000 psig burst pressure and a 800 psig working pressure.
R-410A requires a high-pressure manifold gauge and hose set. They must have a 4000 psig burst pressure and a 800 psig working pressure.
#13. The refrigerant pressure inside an R-410A unit which is at room temperature (72F) and not operating is
Correct answer is C: approximately 210 psig.
The refrigerant pressure inside an R-410A unit which is at room temperature (72F) and not operating is approximately 210 psig.
#14. Every air conditioning or refrigeration system should be protected by a
Correct answer is A: pressure relief device.
Every air conditioning or refrigeration system should be protected by a pressure relief device.
#15. To change the compressor on a system containing 40 pounds of R-500 using a recycling machine that was manufactured AFTER November 15 1993, you must isolate the compressor then
Correct answer is C: evacuate the isolated section of the system to 10 inches of vacuum and hold. If system pressure does not rise, remove the compressor.
To change the compressor on a system containing 40 pounds of R-500 using a recycling machine that was manufactured AFTER November 15 1993, you must isolate the compressor then evacuate the isolated section of the system to 10 inches of vacuum and hold. If system pressure does not rise, remove the compressor.
#16. When inspecting a system for leaks, you should look for
Correct answer is D: traces of oil.
When inspecting a system for leaks, you should look for traces of oil.
#17. When a new system has been assembled, the first thing to do is
Correct answer is B: pressurize the system with an inert gas and leak check.
When a new system has been assembled, the first thing to do is pressurize the system with an inert gas and leak check.
#18. R-410A is different from other ASHRAE 400 series non-azeotropic blends because
Correct answer is A: R-410A behaves as a near azeotropic refrigerant and can be topped off.
R-410A is different from other ASHRAE 400 series non-azeotropic blends because R-410A behaves as a near azeotropic refrigerant and can be topped off.
#19. Manifold gauge set hoses should have self-sealing connectors or hand valves to
Correct answer is D: minimize the release of refrigerant when the hoses are connected and disconnected.
Manifold gauge set hoses should have self-sealing connectors or hand valves to minimize the release of refrigerant when the hoses are connected and disconnected.
#20. When using recovery or recycling equipment that was manufactured AFTER November 15 1993, you must evacuate a system containing MORE than 200 pounds of CFC-12 to _______ before making a major repair.
Correct answer is D: 15 inches of Hg vacuum
When using recovery or recycling equipment that was manufactured AFTER November 15 1993, you must evacuate a system containing MORE than 200 pounds of CFC-12 to 15 inches of Hg vacuum before making a major repair.
#21. With an air-cooled condenser on the roof of a building and the evaporator on the first floor, recovery should first occur
Correct answer is C: from the liquid line entering the evaporator.
With an air-cooled condenser on the roof of a building and the evaporator on the first floor, recovery should first occur from the liquid line entering the evaporator.
#22. Never use oxygen or compressed air to leak check equipment because R-410A can
Correct answer is A: explode when mixed with air or oxygen.
Never use oxygen or compressed air to leak check equipment because R-410A can explode when mixed with air or oxygen.
#23. Dry nitrogen should be used to break the first vacuum when dehydrating by the double evacuation method. However, it
Correct answer is D: can be dangerous if not used with a pressure regulator.
Dry nitrogen should be used to break the first vacuum when dehydrating by the double evacuation method. However, it can be dangerous if not used with a pressure regulator.
#24. A recovery machine that uses a hermetic compressor will overheat when drawing a deep vacuum because
Correct answer is B: the motor needs the flow of refrigerant through the compressor to provide motor cooling.
A recovery machine that uses a hermetic compressor will overheat when drawing a deep vacuum because the motor needs the flow of refrigerant through the compressor to provide motor cooling.
#25. The proper charging method for blended (non-azeotropic) refrigerants (400 series) is to remove the charge from the cylinder as a
Correct answer is B: liquid.
The proper charging method for blended (non-azeotropic) refrigerants (400 series) is to remove the charge from the cylinder as a liquid.
More Type 2 High-Pressure Practice Tests
Type 2 Test 1
Type 2 Test 2
Type 2 Test 3
Type 2 Test 4
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