Information on Low-Pressure Practice Test 2
This is the second of three in our series of free practice tests on handling refrigerants in low-pressure appliances and servicing low-pressure equipment. These 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. Consider sharing our tests 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 Low-Pressure 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 III (Low-Pressure) |
| Test Number: | 2 of 3 |
| Questions on Test: | 25 |
| Passing Score: | 70% |
#1. The primary water source for a recovery unit condensing coil is
Correct answer is C: the local municipal water supply.
The primary water source for a recovery unit condensing coil is the local municipal water supply.
#2. Which statement is NOT true of recycling and recovery equipment manufactured after November 15 1993?
Correct answer is D: It must be able to handle more than one refrigerant.
Which statement is NOT true of recycling and recovery equipment manufactured after November 15 1993? It must be able to handle more than one refrigerant.
#3. A system does not have to be evacuated all the way to the required level when
Correct answer is D: leaks in the appliance make evacuation to the prescribed level impossible.
A system does not have to be evacuated all the way to the required level when leaks in the appliance make evacuation to the prescribed level impossible.
#4. Which action listed below is the proper method to reduce refrigerant loss from a purge unit on a CFC-11 chiller?
Correct answer is A: Leak-test and repair the chiller.
Which action listed below is the proper method to reduce refrigerant loss from a purge unit on a CFC-11 chiller? Leak-test and repair the chiller.
#5. Identify the pressure corresponding to 32F for R-123:
Correct answer is B: 20 inches of Hg vacuum.
Identify the pressure corresponding to 32F for R-123: 20 inches of Hg vacuum.
#6. What precaution should be taken prior to recovering refrigerant from a chiller suspected of having tube leaks?
Correct answer is A: Drain the water sides of the evaporator and condenser.
What precaution should be taken prior to recovering refrigerant from a chiller suspected of having tube leaks? Drain the water sides of the evaporator and condenser.
#7. Pressure relief valves must never be
Correct answer is A: installed in series.
Pressure relief valves must never be installed in series.
#8. If you are going to be removing oil from a low-pressure system, you should heat the oil because
Correct answer is B: less refrigerant will be contained in the oil at high temperatures.
If you are going to be removing oil from a low-pressure system, you should heat the oil because less refrigerant will be contained in the oil at high temperatures.
#9. After recovering the liquid refrigerant you must
Correct answer is A: recover the refrigerant vapor.
After recovering the liquid refrigerant you must recover the refrigerant vapor.
#10. EPA regulations require that any appliances containing more than 50 pounds of refrigerant, except for commercial and industrial process refrigeration, must be repaired when the leak-rate exceeds ______ of the charge per year.
Correct answer is B: 15 percent.
EPA regulations require that any appliances containing more than 50 pounds of refrigerant, except for commercial and industrial process refrigeration, must be repaired when the leak-rate exceeds 10 percent of the charge per year.
NEW LEAK THRESHOLDS WERE EFFECTIVE JAN 2019:
- 30% for Industrial Process Refrigeration
- 20% for Commercial Refrigeration
- 10% for Comfort Cooling
PREVIOUS THRESHOLDS NOW OUTDATED:
- 35% for Industrial Process Refrigeration
- 25% for Commercial Refrigeration
- 15% for Comfort Cooling
#11. If you are using a recovery machine manufactured BEFORE November 15 1993, you must evacuate any low-pressure appliance to ______ before making a major repair.
Correct answer is C: 25 inches of Hg vacuum
If you are using a recovery machine manufactured BEFORE November 15 1993, you must evacuate any low-pressure appliance to 25 inches of Hg vacuum before making a major repair.
#12. On low-pressure chillers, moisture typically enters the refrigerant system through
Correct answer is C: air leaks from areas with gaskets or fittings.
On low-pressure chillers, moisture typically enters the refrigerant system through air leaks from areas with gaskets or fittings.
#13. Refrigerant-11 at a pressure of 17 inches Hg vacuum has a saturation temperature of
Correct answer is B: 35 F
Refrigerant-11 at a pressure of 17 inches Hg vacuum has a saturation temperature of 35 F.
#14. The lowest access point on a low-pressure centrifugal air-conditioning unit is the
Correct answer is A: evaporator charging valve.
The lowest access point on a low-pressure centrifugal air-conditioning unit is the evaporator charging valve.
#15. A rupture disc on a recovery vessel for low-pressure refrigerants relieves at
Correct answer is C: 15 psig
A rupture disc on a recovery vessel for low-pressure refrigerants relieves at 15 psig.
#16. According to ASHRAE Guideline 3-1996, if the pressure in a system rises from 1 mm Hg to a level above ______ during a standing vacuum test, the system should be checked for leaks.
Correct answer is C: 2.5 mm Hg
According to ASHRAE Guideline 3-1996, if the pressure in a system rises from 1 mm Hg to a level above 2.5 mm Hg during a standing vacuum test, the system should be checked for leaks.
#17. During chiller evacuation, water is circulated to
Correct answer is C: prevent freezing of the water.
During chiller evacuation, water is circulated to prevent freezing of the water.
#18. When charging an R-410a water chiller, you must first charge with vapor to a pressure of at least ______ before switching to liquid charging.
Correct answer is B: 120 psig
When charging an R-410a water chiller, you must first charge with vapor to a pressure of at least 120 psig before switching to liquid charging.
#19. If you leak test a low-pressure chiller with nitrogen in excess of 10 psig you could cause the ______ to fail.
Correct answer is D: rupture disc
If you leak test a low-pressure chiller with nitrogen in excess of 10 psig you could cause the rupture disc to fail.
#20. ASHRAE Standard 15-1994 requires that each machinery room must activate an alarm and mechanical ventilation before refrigerant concentrations exceed
#21. Which repair WOULD NOT fall under the EPA definition for major maintenance, service, or repair?
Correct answer is A: Replacing an oil filter.
Which repair WOULD NOT fall under the EPA definition for major maintenance, service, or repair? Replacing an oil filter.
#22. Refrigerant is added to a centrifugal machine through the
Correct answer is D: evaporator charging valve.
Refrigerant is added to a centrifugal machine through the evaporator charging valve.
#23. What is meant by the term “high efficiency purge unit”?
Correct answer is B: Those purge units which discharge a low percentage of refrigerant with the air they remove.
What is meant by the term “high efficiency purge unit”? Those purge units which discharge a low percentage of refrigerant with the air they remove.
#24. The primary purpose of a purge unit on a CFC-11 chiller is to
Correct answer is D: remove noncondensables from the system.
The primary purpose of a purge unit on a CFC-11 chiller is to remove noncondensables from the system.
#25. If you are using a recovery machine manufactured AFTER November 15 1993, you must evacuate any low pressure appliance to ______ before making a major repair.
Correct answer is D: 25mm of Hg absolute
If you are using a recovery machine manufactured AFTER November 15 1993, you must evacuate any low pressure appliance to 25mm of Hg absolute before making a major repair.
More Type 3 Low-Pressure Practice Tests
Type 3 Test 1
Type 3 Test 2
Type 3 Test 3
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