CORE
Polyolester (POE) oils stored in plastic containers will:
A. Separate
B. Become more alkaline
C Become acidic
D. Absorb moisture through the plastic
D. Absorb moisture through the plastic
If a strong odor is detected while performing a refrigerant recovery process,
A. The condenser has been operating incorrectly.
B. A compressor burnout has likely occurred.
C. The wrong oil has probably been installed in the unit.
D. The system has likely been subjected to a power surge.
B. A compressor burnout has likely occurred.
What conditions allow for a system to be opened and repaired without recovering the refrigerant to the required vacuum level?
A. A system with a large leak and internal pressure of 0 psig
B. A system that is undergoing a major component replacement
C. A system that uses a CFC refrigerant
D. A system that has a non-operational compressor
A. A system with a large leak and internal pressure of 0 psig
During evacuation of systems with large amounts of water, it may be necessary to;
A. increase pressure by introducing nitrogen to counteract freezing.
B. purge the condenser by removing nitrogen to encourage freezing.
C. drain the compressor by removing nitrogen to encourage freezing.
D. decrease pressure by introducing nitrogen to counteract freezing.
A. increase pressure by introducing nitrogen to counteract freezing.
When leak testing a low-pressure chiller, the maximum pressure to use is;
A. 5 psig.
B. 10 psig.
C. 15 psig.
D. 20 psig.
B. 10 psig.
R-407C has:
A. A foul odor
B. To be charged in the vapor phase
C. The ability to fractionate
D. No temperature glide
C. The ability to fractionate
Type I Certification is required for;
A. persons handling refrigerant during maintenance, service, or repair of small appliances.
B. all persons who work in the factory that produces refrigerants.
C. all persons working at a refrigerant disposal site.
D. owners of manufacturing companies that produce CFCs.
A. persons handling refrigerant during maintenance, service, or repair of small appliances.
A comfort cooling system that contains 50 pounds or more of R-410A is leaking. What will be the new maximum allowable annual leak rate starting in 2019?
A. 5%
B. 10%
C. 15%
D. 20%
B. 10%
Which of the following best describes the refrigerant recovery process from an R-123 system?
A. Start with vapor removal and then switch over to liquid recovery.
B. Start with liquid removal and then switch over to vapor recovery.
C. Run the compressor and only recover refrigerant in the liquid state.
D. Run the compressor and only recover refrigerant in the vapor state.
B. Start with liquid removal and then switch over to vapor recovery.
When dehydrating a system, it should be evacuated to a minimum level of;
A. 30 inches of Mercury
B. 25,000 Microns
C. 500 Microns
C. 500 Microns
A condensing unit designed for use with R-22:
A. Must be replaced with a model designed for use with R-410A
B. Cannot withstand the higher pressure of R-410A
C. Both A and B
D. None of the above
C. Both A and B
If, after installing a fitting for the purpose of recovering the appliance's refrigerant, you find that the system pressure is 0 psig;
A. Utilize recovery equipment to achieve a 4-inch vacuum.
B. Pressurize the system with nitrogen prior to recovery.
C. Refrigerant recovery is not required.
D. Pressurize the system and leak test.
C. Refrigerant recovery is not required.
What can be done with a refrigerant trace gas and nitrogen mixture after a system leak is found?
A. Recover the mixture.
B. Recover in a special recovery tank.
C. Recycle the refrigerant back into the system.
D. Release to the atmosphere.
D. Release to the atmosphere.
Where is the purge unit located in a low-pressure system?
A. The top of the condenser.
B. In the lowest location.
C. Above the shell.
D. Before the oil separator.
A. The top of the condenser.
After the refrigerant has been recovered, which of the following can be used to flush the system?
A. R-22
B. Compressed air
C. Nitrogen
D. Water
C. Nitrogen
In a refrigeration system, oil and refrigerant:
A. Contain alkybenzene
B. Mix with each other
C. Do not touch each other
D. Are not miscible
B. Mix with each other
Recovery equipment must be;
A. CSA approved.
B. Certified by an EPA-approved testing laboratory.
C. Used on all equipment manufactured after July 1, 1995.
D. Used on all equipment manufactured after November 15, 1995.
B. Certified by an EPA-approved testing laboratory.
Proper recovery techniques begin with the use of appropriate recovery equipment that has been certified by;
A. EPA only
B. Manufacturers approved by UL
C. EPA approved laboratory
D. EPA field supervisors
C. EPA approved laboratory
The most efficient method of leak checking a charged low-pressure refrigeration unit is to;
A. pressurize the system using controlled hot water or heater blankets.
B. pull a 500-micron vacuum and hold for at least 12 minutes.
C. pull a 20-inch vacuum and hold for at least 24 hours.
D. pull a 29.9-inch vacuum and hold for at least 24 hours.
A. pressurize the system using controlled hot water or heater blankets.
Ozone depletion is caused by:
A. HFCs
B. Chlorine and Bromine
C. R-410A refrigerants
D. All of the above
B. Chlorine and Bromine
Removal of refrigerant from a system can be accomplished by these two basic methods:
A. Condensation and evaporation
B. Dew point and bubble point
C. Superheating and subcooling
D. Active and passive
D. Active and passive
Small appliances in recreational vehicles may use refrigerants such as Ammonia, Hydrogen, and water. These refrigerants;
A. Must be recovered.
B. Should not be recovered.
C. Should be stored for later use.
D. Must be pressurized prior to use.
B. Should not be recovered.
If a leaking appliance with a regulated refrigerant is not going to be repaired, it must be;
A. retrofitted or retired within 3 months.
B. retrofitted or retired within 12 months.
C replaced within 3 months.
D. replaced within 12 months.
B. retrofitted or retired within 12 months.
Which of the following refrigerants has a safety classification of B-1
A. CFC-12 (R-12)
B. HFC-134a (R-134a)
C. HCFC-123 (R-123)
D. CFC-11 (R-11)
C. HCFC-123 (R-123)
A high-pressure appliance containing less than 200 lbs. of an HCFC or HFC refrigerant must be evacuated (recovered) to a level of;
A. 15 inches of vacuum
B. 10 inches of vacuum
C. 4 inches of vacuum
D. 0 inches of vacuum
D. 0 inches of vacuum