CORE
Which of the following refrigerants is an HFO?
A. R-22
B. R-134a
C. R-410A
D. R-1234ze
D. R-1234ze
Applying heat, with a heat gun, to the compressor;
A. can help free-up a bound compressor motor.
B. can help vaporize any trapped liquid refrigerant during recovery.
C. can help remove trapped refrigerant vapor during recovery.
D. can aid in isolating and pinpointing a refrigerant leak.
B. can help vaporize any trapped liquid refrigerant during recovery.
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 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.
A high-pressure appliance containing 210 lbs. of R-407C 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
Which type of refrigerant contains no chlorine?
A. HCFCs
B. HCFC Blends
C. HFCs
D. CFCs
C. HFCs
Which of the following is an example of a non-condensable?
A. Moisture
B. Air
C. R-12
D. R-134a
B. Air
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%
Because a low-pressure system operates below atmospheric pressure (in a vacuum),
A. the system is unlikely to have air and moisture enter the system.
B. leaks in gaskets or fittings will cause air and moisture to enter the system.
C. leaks in the gaskets or fittings will cause substantial refrigerant leaks.
D. leaks in the gaskets or fittings will cause oil clogging at the condenser.
B. leaks in gaskets or fittings will cause air and moisture to enter the system.
How long would an equipment owner or operator have to retrofit or retire an appliance that has exceeded the threshold leak rate if the replacement appliance uses 50 pounds or more of an exempt refrigerant?
A. 24 months.
B. 18 months.
C. 12 months.
D. 3 months.
B. 18 months.
Which ASHRAE classification means slightly flammable?
A. A1
B. A2L
C. A3
D. B1
B. A2L
When filling a charging cylinder with a regulated refrigerant;
A. The refrigerant vapor that is vented off the top of the cylinder must be recovered.
B. The refrigerant must be added to the cylinder in the vapor phase to reduce losses.
C. The refrigerant being added to the cylinder must be weighed in to ensure accuracy.
D. The refrigerant vapor can be vented off the top of the cylinder as a deminimus release.
A. The refrigerant vapor that is vented off the top of the cylinder must be recovered.
A new split system should be checked for leaks by;
A. pressurizing the system with a few ounces of HCFC-22 and compressed air.
B. pressurizing the system with a few ounces of CFC-12 and an inert gas.
C. releasing the factory refrigerant charge in the condensing unit.
D. pressurizing the system with a few ounces of system refrigerant and an inert gas.
D. pressurizing the system with a few ounces of system refrigerant and an inert gas.
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.
Clean refrigerant for reuse by separating the oil from the refrigerant and removing moisture from the refrigerant by passing it through one or more filter driers, is the definition of;
A. Recover
B. Reclaim
C. Reuse
D. Recycle
D. Recycle
Which of the following is true regarding refrigerant leaks on small appliances?
A. EPA does not require repair, but leaks should be repaired whenever possible.
B. All leaks on Type I equipment must be repaired.
C. Only very large leaks must be repaired.
D. All systems with an annualized leak rate of 15 percent or greater must be repaired.
A. EPA does not require repair, but leaks should be repaired whenever possible.
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
When charging a low-pressure system, refrigerant should be introduced to the system as a vapor to raise the system's saturation temperature to a minimum of;
A. 0 degrees.
B. 36 degrees.
C. 40 degrees.
D. 70 degrees.
B. 36 degrees.
Which of the following refrigerant has a GWP closest to "1"?
A. R-22
B. R-134a
C. R-410A
D. R-1233zd
D. R-1233zd
Before shipping any used refrigerant cylinders, check that the cylinder meets what standards:
A. Department of Transportation
B. The Significant New Alternatives Policy (SNAP)
C. Underwriters Laboratories
D. All of the above
A. Department of Transportation
With a non-operating system compressor, recovery equipment must be capable of recovering;
A. 90 percent of the refrigerant or achieving 4 inches of vacuum.
B. 90 percent of the refrigerant or achieving 5 inches of vacuum.
C. 80 percent of the refrigerant or achieving 5 inches of vacuum.
D. 80 percent of the refrigerant or achieving 4 inches of vacuum.
D. 80 percent of the refrigerant or achieving 4 inches of vacuum.
Which of the following refrigerants is classified as a very high-pressure refrigerant?
A. CFC-11
B. R-744
C. HCFC-123
D. R-410A
B. R-744
When installing more than one, pressure relief valves must be installed;
A. in series with each other.
B. in parallel with each other.
C. in the system's suction line.
D. on top of compressor head.
B. in parallel with each other.
The low-side test-pressure data-plate value should be used by a technician to determine a safe pressure for:
A. recovering refrigerant.
B. leak testing.
C. refrigerant charging.
D. retrofitting a system.
B. leak testing.
Which of the following has the highest Ozone Depletion Potential?
A. HFOs
B. HCFCs
C. HFCs
D. CFCs
D. CFCs
Which HC refrigerant is allowed for use in NEW Domestic Small Appliances?
A. R-404A
B. R-410A
C. R-600a
D. R-717
C. R-600a
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
What type of equipment can be worked on with Type III certification?
A. High-pressure
B. Medium-pressure
C. Low-pressure
D. Vacuum pressure
C. Low-pressure
Unless plans are made to replace a system with a leak rate that exceeds the maximum leak rate, repairs must be made within;
A. 30 days.
B. 45 days.
C. 60 days
D. 90 days.
A. 30 days.
The compressor ____________________________________
A. changes a high-pressure vapor to a high-pressure liquid.
B. changes a low-pressure vapor to a high-pressure vapor.
C. changes a high-pressure liquid to a low-pressure liquid.
D. changes a low-pressure liquid to a low-pressure vapor.
B. changes a low-pressure vapor to a high-pressure vapor.
When using a system-dependent recovery system on an appliance that has a non-operating compressor, the technician should;
A. Place access fitting on both the low and high side of the system.
B. Not heat the oil to release refrigerant.
C. Send the unit to the junk yard to be crushed.
D. Cut the unit's suction line to release the refrigerant.
A. Place access fitting on both the low and high side of the system.
A crankcase heater is often used to prevent refrigerant from mixing with compressor oil during periods of:
A. Low ambient temperature
B. High ambient temperature
C. Low humidity
D. High humidity
A. Low ambient temperature
The rupture disk on a low-pressure chiller has a burst pressure of;
A. 5 psig
B. 10 psig
C. 15 psig
D. 20 psig
C. 15 psig
EPA regulations state that removal of which component constitutes a "major repair"?
A. Pressure switch
B. Compressor
C. Liquid line drier
D. Evaporator fan motor
B. Compressor
A refrigerant cylinder designed to hold recovered refrigerant has a:
A. yellow body and grey top.
B. grey body and yellow top.
C. green body and yellow top.
D. orange body and grey top.
B. grey body and yellow top.
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
Refrigerant should be recovered from the condenser outlet if the condenser is;
A. Below the receiver
B. Above the receiver
C. On the roof
D. Is leaking
A. Below the receiver
After all the liquid has been removed from an average 350-ton, low-pressure appliance, approximately how much vapor refrigerant remains in the system?
A. 100 pounds
B. 150 pounds
C. 350 pounds
D. 45 pounds
A. 100 pounds
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.
How much can a person be fined per day per violation for knowingly releasing a regulated substance that violates the Clean Air Act?
A. $10,000
B. $25,000
C. $37,000
D. $44,539
D. $44,539
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.
When an appliance containing 50 pounds or more of a regulated refrigerant leaks refrigerant at an annual rate of 125% or more, what must be included on the leak inspections records?
A. Initial verification, verification tests and records of recovered refrigerant from equipment.
B. Quantity of refrigerant sold, procedures performed, date of call, name, address and phone number of manufacturer.
C. Quantity of refrigerant, address of service technician, number of years in HVAC.
D. The amount of refrigerant and addresses only.
A. Initial verification, verification tests and records of recovered refrigerant from equipment.
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.
Where is refrigerant added to a low-pressure system during the charging process?
A. The access valve on the purge unit entering the condenser.
B. The lowest access point on the system such as the condenser charging valve.
C. The highest access point on the system such as the evaporator inlet valve.
D. The lowest access point on the system such as the evaporator charging valve.
D. The lowest access point on the system such as the evaporator charging valve.
What is the Significant New Alternatives Policy (SNAP) Program?
A. EPA's program that identifies refrigerants with lower overall risks to human health and the environment.
B. Covers only CFC and HCFC refrigerants used in residential air conditioning.
C. Relates to CFC and HCFC refrigerants used in commercial air conditioning.
D. Covers only CFC and HCFC refrigerants used in industrial process refrigeration.
A. EPA's program that identifies refrigerants with lower overall risks to human health and the environment.
When pressurizing a system with nitrogen you should;
A. never exceed 3.5 times the high side pressure rating.
B. charge through a pressure regulator.
C. install a relief valve in the line downstream from the pressure regulator.
D. Both B and C.
D. Both B and C.
Refrigerants CFC-12, HCFC-22, and HFC-134a are all classified as Type _______ substances.
A. B-1
B. B-2
C. A-1
D. A-2
C. A-1
When pressurizing a low-pressure system for leak-detection purposes, do not exceed
A. 5 psig
B. 10 psig
C. 15 psig
D. 20 psig
B. 10 psig
How long would an equipment owner or operator have to retrofit or retire an appliance that has exceeded the threshold leak rate if the replacement appliance uses 50 pounds or more of an exempt refrigerant?
A. 24 months.
B. 18 months.
C. 12 months.
D. 3 months.
B. 18 months.