Information on High Pressure Practice Test 3
This is the third free practice test of four in our series of tests on compliance while handling and servicing refrigerants in high-pressure appliances and equipment. Our practice tests render great on phones and tablets and are among the best mobile-friendly tests on the web. Please consider sharing them with other people or in forums that may find them useful. 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: | 3 of 4 |
| Questions on Test: | 25 |
| Passing Score: | 70% |
#1. A routine maintenance task which must be performed on refrigerant recycling machines is to
Correct answer is D: change filter and compressor oil if any.
A routine maintenance task which must be performed on refrigerant recycling machines is to change filter and compressor oil if any.
#2. Refrigerant should be removed from the condenser outlet if the
#3. When evacuating a system, the use of a large vacuum pump could
Correct answer is C: cause trapped water to freeze.
When evacuating a system, the use of a large vacuum pump could cause trapped water to freeze.
#4. On refrigeration units that use an open compressor, the ________ is most likely to leak if the unit is not used for several months.
Correct answer is B: rotating shaft seal
On refrigeration units that use an open compressor, the rotating shaft seal is most likely to leak if the unit is not used for several months.
#5. The primary water source most often used for cooling the condenser of a water-cooled recovery unit is
Correct answer is D: local municipal water supply.
The primary water source most often used for cooling the condenser of a water-cooled recovery unit is local municipal water supply.
#6. When using recovery and recycling equipment manufactured BEFORE November 15 1993, technicians must evacuate a unit that has a normal charge of 10 pounds of CFC-500 to _______ before disposing of the system.
Correct answer is B: 4 inches of Hg vacuum
When using recovery and recycling equipment manufactured BEFORE November 15 1993, technicians must evacuate a unit that has a normal charge of 10 pounds of CFC-500 to 4 inches of Hg vacuum before disposing of the system.
#7. The evaporation temperature of R-410a at 100 psig is about
Correct answer is B: 30 F
The evaporation temperature of R-410a at 100 psig is about 30 F.
#8. Noncondensables in a system cause a
Correct answer is D: higher discharge pressure.
Noncondensables in a system cause a higher discharge pressure.
#9. When charging an R-410a 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 B: 120 psig
When charging an R-410a system that uses a water-cooled condenser, you must first charge with vapor to a pressure of at least 120 psig before switching to liquid charging.
#10. R-410a requires recovery tanks rated for at least
Correct answer is C: 400 psig
R-410a requires recovery tanks rated for at least 400 psig.
#11. The recovery rate can be increased by
Correct answer is A: packing the recovery vessel in ice.
The recovery rate can be increased by packing the recovery vessel in ice.
#12. Oil foaming usually occurs in the
Correct answer is C: compressor.
Oil foaming usually occurs in the compressor.
#13. During the evacuation of a system that contains large amounts of moisture, it may be necessary to increase pressure in the system with _______ to counteract freezing of the moisture.
Correct answer is D: nitrogen
During the evacuation of a system that contains large amounts of moisture, it may be necessary to increase pressure in the system with nitrogen to counteract freezing of the moisture.
#14. Prior to replacing the condenser coil in a high pressure system, the refrigerant was recovered and stored in a refillable cylinder. The refrigerant
Correct answer is A: can probably be charged back into the system.
Prior to replacing the condenser coil in a high pressure system, the refrigerant was recovered and stored in a refillable cylinder. The refrigerant can probably be charged back into the system.
#15. The evaporation temperature of R-134a at 0 psig is
Correct answer is B: –15 F
The evaporation temperature of R-134a at 0 psig is -15 F.
#16. When servicing a 60-ton packaged rooftop unit, the easiest way to check the type of refrigerant it uses is to
Correct answer is C: look at the unit nameplate.
When servicing a 60-ton packaged rooftop unit, the easiest way to check the type of refrigerant it uses is to look at the unit nameplate.
#17. 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: 10 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.
THIS BECAME EFFECTIVE JANUARY 2019: For comfort cooling appliances with 50 lbs or more , leak inspections must be conducted once per calendar year until such time your leak-rate calculations show that you have not exceeded the threshold limit of 10% for one year.
In addition to this, after leak repairs on any of these appliance types you will need to conduct an initial test for verification as well as a follow-up. PREVIOUSLY the allowable leak rate was 15% for comfort cooling with 50 lbs or more.
#18. EPA regulations require that leaking commercial or industrial process refrigeration equipment must be repaired when the leak-rate exceeds ________ of the charge per year.
Correct answer is D: 30%
EPA regulations require that leaking commercial or industrial process refrigeration equipment must be repaired when the leak-rate exceeds 30% of the charge per year.
NEW LEAK THRESHOLDS BECAME EFFECTIVE JANUARY 2019: Leak rates for commercial refrigeration now cannot exceed 20 percent and cannot exceed 30 percent for industrial process refrigeration. The previous thresholds were 35% for both commercial refrigeration and industrial process refrigeration.
#19. You are going to service an older residential split-system air conditioner. You would expect to find the system charged with which refrigerant?
Correct answer is C: R-22
You are going to service an older residential split-system air conditioner. You would expect to find the system charged with which refrigerant? R-22
#20. For what refrigerant is an equipment room refrigerant monitor required under ASHRAE Standard 15?
Correct answer is D: R-123
For what refrigerant is an equipment room refrigerant monitor required under ASHRAE Standard 15? R-123
#21. Heat pumps that use R-134a should be leak-checked with
Correct answer is D: pressurized nitrogen.
Heat pumps that use R-134a should be leak-checked with pressurized nitrogen.
#22. On a high-pressure system, ________ is an indicator of a possible leak.
Correct answer is C: excessive superheat
On a high-pressure system, excessive superheat is an indicator of a possible leak.
#23. System-dependent recovery equipment CANNOT be used when
Correct answer is D: the appliance contains over 15 pounds of refrigerant.
System-dependent recovery equipment CANNOT be used when the appliance contains over 15 pounds of refrigerant.
#24. Moisture is removed from a system by
Correct answer is D: using a filter drier.
Moisture is removed from a system by using a filter drier.
#25. Which component is not part of the low side of a system?
Correct answer is B: Receiver
Which component is not part of the low side of a system? Receiver
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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