Information on CORE Practice Test 3
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This is the third test of five in our CORE series of free practice tests designed to help you pass your 608 certification exams.
* 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 a colossal 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%.
- Correct answer information is provided for questions answered incorrectly.
- Good luck!
| Trade Category: | HVACR |
| Test Category: | EPA 608 Certification |
| Test Subject: | Core |
| Test Number: | 3 of 5 |
| Questions on Test: | 25 |
| Passing Score: | 70% |
#1. The recovery of refrigerants is necessary to
Correct answer is D: All of the above.
The recovery of refrigerants is necessary for all of the following:
- A. maintain adequate supplies for service calls after production bans.
- B. prevent the venting of refrigerants to the atmosphere.
- C. prevent stratospheric ozone depletion.
#2. An example of an HFC refrigerant is
Correct answer is A: R-410a
An example of an HFC refrigerant is R-410a.
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- R-410a is a HFC
- R-115 is a CFC
- R-22 is a HCFC
- R-11 is a CFC
#3. A compound pressure gauge, typically used on the low side of the system, measures pressure in
Correct answer is C: psig and inches of mercury.
A compound pressure gauge, typically used on the low side of the system, measures pressure in psig and inches of mercury.
#4. _________ refers to the process of cleaning refrigerant by oil separation and single or multiple passes through filter-driers, which reduces moisture and acidity.
Correct answer is A: Recycling
Recycling refers to the process of cleaning refrigerant by oil separation and single or multiple passes through filter-driers, which reduces moisture and acidity.
#5. The high-pressure gauge on service manifold sets have a continuous scale, usually calibrated to read from
Correct answer is C: 0 to 500 psi.
The high-pressure gauge on service manifold sets have a continuous scale, usually calibrated to read from 0 to 500 psi.
#6. _________ is the process that returns refrigerant to new-product specifications that requires chemical analysis.
Correct answer is C: Reclaiming
Reclaiming is the process that returns refrigerant to new-product specifications that requires chemical analysis.
#7. A cylinder with a gray body and a yellow top indicate that the cylinder is designed to hold
Correct answer is D: recovered refrigerant.
A cylinder with a gray body and a yellow top indicate that the cylinder is designed to hold recovered refrigerant.
#8. HCFC refrigerants are
Correct answer is C: less harmful to stratospheric ozone than CFCs.
HCFC refrigerants are less harmful to stratospheric ozone than CFCs.
#9. Which type of refrigerant is the most harmful to stratospheric ozone?
Correct answer is A: Refrigerants containing bromine.
Which type of refrigerant is the most harmful to stratospheric ozone? Refrigerants containing bromine.
#10. According to the EPA, a __________ leak detection method is considered to be the most effective for locating the general area of a small leak.
Correct answer is B: electronic or ultrasonic tester
According to the EPA, an electronic or ultrasonic tester leak detection method is considered to be the most effective for locating the general area of a small leak.
#11. Long hoses between the unit and the recovery machine should not be used because they cause
Correct answer is D: All of the above.
Long hoses between the unit and the recovery machine should not be used because they cause all of the following:
- excessive pressure drop.
- increased recovery time.
- increased emissions.
#12. Recovery equipment that relies upon the compressor in the system would be considered
Correct answer is A: system-dependent.
Recovery equipment that relies upon the compressor in the system would be considered system-dependent.
#13. A hermetic compressor must never be operated when
Correct answer is C: there is a dehydration vacuum in the system.
A hermetic compressor must never be operated when there is a dehydration vacuum in the system.
#14. Systems charged with R-410a should be leak checked with
Correct answer is C: pressurized nitrogen.
Systems charged with R-410a should be leak checked with pressurized nitrogen.
#15. R-410a is not a typical blended refrigerant because
Correct answer is D: All of the above are true.
R-410a is not a typical blended refrigerant because of all of the following:
- it is a near azeotropic refrigerant.
- it can be charged as either a liquid or vapor.
- while it has a 400 series refrigerant number, it behaves like a 500 series refrigerant.
#16. A ternary refrigerant blend is a __________ mixture.
Correct answer is B: three-part
A ternary refrigerant blend is a three-part mixture.
#17. In a refrigeration system, high pressure vapor is converted to high pressure liquid in the
Correct answer is D: condenser.
In a refrigeration system, high pressure vapor is converted to high pressure liquid in the condenser.
#18. Which of the following is an approved “drop-in” service replacement for R-12?
Correct answer is D: According to the EPA there are no “drop-in” replacements.
Which of the following is an approved “drop-in” service replacement for R-12? According to the EPA there are no “drop-in” replacements.
#19. The proper method of discarding a disposable refrigerant cylinder is to
Correct answer is D: assure that all refrigerant is recovered and that the cylinder is rendered useless, then recycle the metal.
The proper method of discarding a disposable refrigerant cylinder is to assure that all refrigerant is recovered and that the cylinder is rendered useless, then recycle the metal.
#20. CFC refrigerants are so named because they contain the elements
Correct answer is A: chlorine, fluorine, and carbon.
CFC refrigerants are so named because they contain the elements chlorine, fluorine, and carbon.
#21. Before you dispose of any system containing a refrigerant, you must
<p>Correct answer is A: recover the refrigerant. </p>
<p>Before you dispose of any system containing a refrigerant, you must recover the refrigerant.</p>
#22. According to EPA regulations, which of the following procedures is not an approved technique for system cleanup after a burnout?
<p>Correct answer is B: Flushing with liquid refrigerant to clean tubing. </p>
<p>According to EPA regulations, which of the following procedures is not an approved technique for system cleanup after a burnout? Flushing with liquid refrigerant to clean tubing.</p>
#23. When using nitrogen to pressurize a system, you should always
<p>Correct answer is B: charge through a pressure regulator. </p>
<p>When using nitrogen to pressurize a system, you should always charge through a pressure regulator.</p>
#24. What effects can ozone depletion have on the environment?
Correct answer is D: All of the above.
What effects can ozone depletion have on the environment? Any and all of the following:
-
- Reduced crop yields.
-
- Reduced marine life.
-
- Increased ground-level ozone.
#25. Non-azeotropic refrigerants leak from a system
Correct answer is B: in uneven amounts due to different vapor pressures.
Non-azeotropic refrigerants leak from a system in uneven amounts due to different vapor pressures.
More 608 CORE Practice Tests
CORE Test 1
CORE Test 2
CORE Test 3
CORE Test 4
CORE Test 5
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