EPA Core and Type II
A disposable cylinder should be reduced to what pressure before scrapping? A. O psig B. 20 psig C. 50 psig D. 80 psig
A
Every refrigerating system must be protected by which of the following? A. A pressure relief device B. A properly located stop valve C. A low pressure control D. A refrigerant receiver
A
Every refrigerating system must be protected by which of the following? A. A pressure relief device B. A properly located stop valve pg. C. A low pressure control D. A refrigerant receiver
A
In addition to fines and being required to appear in court, what penalty can be imposed on service technicians who violate Clean Air Act provisions? A. They may lose their certification. B. They may have equipment confiscated. C. They may be required to take mandatory training. D. They may be required to pass an online test.
A
Refrigerant has been recovered from an air-conditioning system and held in a refillable cylinder in order to replace the condenser coil. The refrigerant: A. may be charged back into system B. may be sold as is to another equipment owner. C. must be reclaimed. D. must be destroyed
A
Under EPA's regulations, what standard must reclaimed refrigerant meet before it can be resold? A. AHRI 700 B. EPA 700 C. ASHRAE 700 D. UL 700
A
Under section 608 "safe disposal requirements" Who is responsible for ensuring CFC, HCF, and HFC refrigerant has been removed from household refrigerators before they are disposed of? A. The final person in the disposal chain. B. The service technician who last worked on the equipment. C. The manager/supervisor D. The Environmental Protection Agency field staff.
A
What is the Montreal Protocol? A. An international treaty that addresses ozone-depleting substances and their alternatives. B. A test for energy efficiency adopted by the Canadian government. C. A procedure for measuring levels of CFCS in the atmosphere. D. A test for ozone concentration.
A
When could a reciprocating compressor be damaged if energized? A. When the discharge service valve is closed. B. When the suction service valve is open C. When the discharge service valve is open. D. When the demand for cooling is at a steady state.
A
When should refrigerant be removed from the condenser outlet? A. When the condenser is below the receiver. B. When the condenser is on the roof. C. When the condenser is inoperative. D. When the evaporator has a small leak.
A
Which is the easiest way to check the type of refrigerant used in a 60 ton packaged rooftop unit? A. Look at the unit nameplate. B. Use your service gauge set and a PT chart. C. Ask the owner. D. Measure the condenser pressure.
A
Which of the following refrigerants is an HFO? A. R-1234yf B. R-123 C. R-134a D. All three are HFOS
A
Which of the following repairs would always be considered "major" under EPA's regulations? A. Replacement of an evaporator coil. B. Replacement of a filter-drier. C. Replacement of a Schrader valve core. D. Replacement of a condenser fan motor.
A
Which of the following should be replaced if a system is opened for servicing? A. Filter drier B. Thermostat C. Metering device D. Crankcase heater
A
Which type of refrigerant is the most harmful to stratospheric ozone? A. CFCS B. HCFCS C. HFCS D. HFOS
A
You are chmaging out the compressor of a system containing 40 pounds of R-404A. In addition to isolating the compressor, Which of the following procedures should you follow? A. Simply remove the compressor and The ends B. Evacuate the isolated section of the system to atmospheric pressure then remove the compressor C. Evacuate the isolated section of the system to 5 inches of vacuum and when the systems pressure rises out of the vacuum remove the compressor
A
Which process applies to cleaning refrigerant for immediate reuse by oil separation and single or multiple passes through devices, like replaceable core filter driers, which reduce moisture and acidity? A. Recycling B. Recovering C. Reclaiming D. Restoring
A.
What synthetic lubricant is presently used with ternary blends containing HCFCS? A. Alkylbenzene B. Glycol C. Ester D. Castor Oil
Alkylbenzene
An initial leak verification test failed after repairing a leak in a rack refrigeration system for a supermarket using an HCFC refrigerant. What would be the next steps? A. Immediately retrofit or retire the appliance B. Conduct additional repairs within the 30 day repair window or mothball the appliance. C. Conduct a follow up verification test D. Report the amount of refrigerant added to the system to the EPA
B
For an appliance that uses a CFC, HCFC, or HFC refrigerant, which of the following violates the prohibition on venting? A. Accidental releases associated with timely repair of an appliance. B. Refrigerants emitted when cutting a line without properly evacuating the appliance. C. Refrigerants emitted in a catastrophic failure of an appliance. D. Refrigerants emitted when connecting or disconnecting low loss hoses to charge or service an appliance.
B
How can you speed up the removal of the refrigerant charge from a system? A. Using a smaller recovery vessel. B. Cooling the recovery cylinder to lower its pressure C. Using a two-stage vacuum pump. D. Heating the recovery cylinder to raise its pressure
B
How do refrigerant blends leak from a system? A. At a faster rate than other refrigerants. B. At uneven rates due to different vapor pressures. C. At a slower rate than other refrigerants. D. In exactly the same way as all other refrigerants.
B
How do the global warming potentials of isobutene (R-600a), propane (R-290), and R-441A compare to the GWPS of HFC-134a, R-404A, and R-410A. A. They are significantly higher. B. They are significantly lower. C. They are approximately equal. D. They are just slightly higher.
B
In the event of a large release of CFC, HCFC, or HFC refrigerant in a contained area, which of the following is true? A. Safety goggles and lined butyl gloves are sufficient. B. Self-contained breathing apparatus (SCBA) or leaving the area is required. C. Respiratory protection is not required. D. Dust masks are sufficient.
B
Pressure relief valves can only be installed: A. In series B. in parallel. C. vertically. D. horizontally.
B
Recovering refrigerant from a system in the vapor phase will minimize the loss of which of the following? A. Water В. Оil C. Refrigerant D. Non-condensables
B
Starting in 2019, what leak rate triggers the EPA requirement that commercial refrigeration systems containing 50 pounds or more of R-22 be repaired? A. 10% В. 20% С. 30% D. 35%
B
What affect will low ambient temperatures have on recovery? A. Shortened recovery time. B. Increase the recovery time. C. Minimize emissions. D. Require frequent drier changes.
B
What are the characteristics of hydrofluoroolefins (HFOS)? A. Non-ozone depleting, and have high global warming potentials. B. Non-ozone depleting, and have a low global warming potentials. C. Ozone depleting, and have high global warming potentials. D. Ozone depleting, and have low global warming potentials.
B
What does ozone in the stratosphere above the earth consist of? A. Molecules containing 2 oxygen atoms. B. Molecules containing 3 oxygen atoms. C. Molecules containing 4 oxygen atoms. D. Molecules containing 5 oxygen atoms.
B
What is being done in the US to stop damage to the stratospheric ozone layer? A. Using natural gas instead of coal to generate electricity. B. Phasing out the use of chlorofluorocarbons and hydrochlorofluorocarbons. C. Enforcing strict emission requirements on incinerators. D. Increasing the energy efficiency of air conditioners.
B
What should a technician do if they lose their Section 608 certification card? A. Request a replacement from the EPA. B. Request a replacement from their certifying organization. C. Remain silent so as not to tell anyone they are not in compliance with that regulation. D. Have your friend vouch for you.
B
What should be done after reaching the required recovery vacuum on an appliance? A. Immediately disconnect the recycling or recovery equipment, and open the system for service. B. Wait for at least a few minutes to see if the system pressure rises. C. Break the vacuum with nitrogen and open the system for service. D. Pressurize the system with the nitrogen and perform a leak check.
B
Which element of a CFC or HCFC molecule causes ozone depletion? A. Fluorine B. Chlorine C. Carbon D. Hydrogen
B
Which if the following factors affect the speed of system dehydration? A. The ambient temperature and the entropy of the refrigerant. B. The ambient temperature and amount of moisture in the system. C. The latent heat content of the refrigerant. D. The system superheat.
B
Which of the following is not a violation of the refrigerant management regulations under the Clean Air Act? A. Failing to recover refrigerant in a system to the required evacuation level. B. Servicing a system that uses CFCS or HCFCS after the phaseout of those refrigerants. C. Failing to recover refrigerant in a leaking system to at least 0 psig D. Adding nitrogen to a fully charged system, then call the mixture a "leak check gas" and venting the mixture to the atmosphere.
B
Which of the following leak detection methods is considered to be the most effective for locating the general area of a small leak? A. Standing vacuum test B. Electronic or ultrasonic tester C. Halide torch D. Audible sound
B
Which of the following refrigerants would be used in a low-pressure appliance? A. R-22 В. R-123 C. R-410A D. R-407A
B
Which of the following statements about recycling and recovery equipment used for stationary refrigeration is FALSE? A. It must be tested by anEPA approved third-party B. Purchases of such a equipment must be reported to the EPA. C. It must be equipped with low-loss fittings. D. Equipment designed to recover flammable refrigerant must meet a specific UL safety standard.
B
Which part of a belt-driven non-hermetic compressor is most likely to leak if the compressor has not been used for several months? A. Suction service valve B. Rotating shaft seal C. One or both of the king valves D. Head gasket on discharge side
B
Why could a recycling or recovery machine that uses a hermetic compressor overheat when drawing deep vacuums? A. It runs faster than other equipment with oil less compressors B. The motor relies on the flow of refrigerant through the compressor for cooling C. It has a higher compression ratio limit than other equipment D. The oils used in hermetic compressors are a lower viscosity than oiles used in other equipment
B
How should disposable cylinders of CFCS, HCFCS, and HFCS be discarded? A. Bleed any remaining refrigerant to ambient air and put the cylinders into a trash dumpster. B. Recover all refrigerant, render the cylinders useless and recycle the metal. C. Refill the cylinders at an approved facility and reuse. D. Reuse the cylinders as recovery tanks.
B.
Refrigerant cylinders should be all of the following EXCEPT: A. Be free of rust and damage. B. Be filled to 95% capacity. C. Be labeled. D. Be secure.
Be filled to 95% capacity.
8. A comfort-cooling appliance containing 50 pounds or more of R-22 is found to be leaking beyond the appliance leak rate threshold. Unless granted additional time, how may days do you have to repair the leak and conduct the initial leak verification test? A. 1 day B. 10 days C. 30 days D. 45days
C
A refrigerant label to identify the type of refrigerant recovered is placed on recovery cylinder for all of the following reasons, EXCEPT to: A. Avoid accidental mixing of recovered refrigerants. B. Allow the recycler to identify the contents. C. Tell if the cylinder is safe. D. Allow the technician's company to determine the amount of refrigerant recovered for recordkeeping purposes.
C
After a leak repair of a supermarket rack using 3000 lbs of R-22 and a successful initial verification test, when must a follow-up leak verification test be conducted? A. The same day B. The next day C. Within 10 days D. Within 30 days
C
Before making a major repair, technicians must evacuate an appliance or component containing more that 200 pounds of R-410a to which of the following levels? A. O psig B. 25 mm Hg absolute C. 10 inches of Hg vacuum D. 15 inches of Hg vacuum
C
Chlorofluorocarbons (CFCS), hydrochlorofluorocarbons (HCFCS) and hydrofluorocarbons (HFCS) have which of the following in common? A. They deplete the stratospheric ozone layer. B. They contain chlorine. C. They must be recovered before opening or disposing of appliances. D They have the same saturation pressure at 70°F.
C
How should refrigerant blends be charged? A. As a vapor. B. At very high temperatures. C. As a liquid. D. The same as other refrigerants.
C
In what state does the refrigerant leave the condenser? A. Low pressure liquid B. Low pressure vapor C. High pressure liquid D. High pressure vapor
C
What is the primary water source for a water-cooled recovery unit's condensing coil? A. Chilled water from the evaporator B. Condenser water C. Local municipal water supply D. De ionized water
C
What is the state of the refrigerant leaving the receiver in a refrigeration system? A. Low pressure liquid. B. Low pressure vapor C. High pressure liquid D. High pressure vapor
C
What should a technician do if they discover that some R-410A was added to an R-22 system? A. Vent the refrigerant since it cannot be reclaimed. B. Recycle the refrigerant. C. Recover the mixture in a separate recovery tank. D. Recover and use in another system.
C
What units does a compound pressure gauge for the low side of the system measure pressure in? A. Psia B. Torrs and microns C. Psig and inches of mercury D. Psia and microns
C
When a trace gas becomes absolutely necessary, which of the available gases should be used to help locate a leak? A. Nitrogen with HCFC R-22. B. R-22 due to its universal system compatibility and its miscibility with various oils. C. Nitrogen with a trace amount of the system's design refrigerant. D. Nitrogen with HFC R-410A.
C
When is it against EPA regulations to use system-dependent recovery equipment? A. When the compressor of the appliance is operational. B. When the ambient temperature is over 105°F. C. When the appliance contains over 15 pounds of refrigerant. D. When the appliance is leaking. speed up the removal
C
When recovery is first started, at what phase is the refrigerant removed to save recovery time? A. Recovery phase B. Recycle phase C. Liquid phase D. Vapor phase
C
Where must you connect a hose in order to recover liquid refrigerant? A. The compressor suction valve B. The compressor discharge valve C. The liquid line D. The condenser inlet
C
Which of the following is an indicator of a leak in a high-pressure system with a capillary tube? A. High head pressure B. Low water temperature C. Excessive superheat D. Frequent purging
C
Which refrigerant depletes the ozone layer? A. R-717 B. R-744 C. R-22 D. R-32
C
Why are HFO refrigerants less flammable than hydrocarbon refrigerants? A. They contain chlorine, B. They contain bromine. C. They contain fluorine. D. They contain carbon.
C
Why do gauge set hoses used for field service work have self-sealing connectors or hand valves? A. To minimize the chance of an explosion during refrigerant recovery. B. To prevent vapor lock during vapor transfer to recovery cylinder. C. To minimize refrigerant release when hoses are connected and disconnected. D. To prevent vapor lock during liquid transfer to recovery cylinder.
C
You have to leak check a unit which has lost a complete charge which gas(es) would cause the least damage to the environment? A. Dry nitrogen and R-22 B. Compressed air and R-22 C. Dry nitrogen D. Dry nitrogen and R-134a
C
Which type of refrigerant has the highest ozone depletion potential (ODP)? A. HCFCs B. HFCs C. CFCs D. HFOs
CFCS
Which of the following gases is used as the baseline measurement for global warming potential? A. Ammonia B. Carbon dioxide C. CFC-12 D. Propane
Carbon dioxide
After refrigerant liquid has been recovered from the appliance, any remaining vapor is: A. purged to the atmosphere B. isolated in the appliance C. pumped into appliance receiver D. removed by the recovery system
D
For what refrigerant is an equipment room refrigerant detector not required under ASHRAE 15 provided the mechanical ventilation system in the machinery is run continuously? A. R-134a B. R-404A C. R-410A D. R-717
D
HFC refrigerants contain which of the following? A. Chlorine, fluorine, and carbon B. Chlorine, fluorine, and hydrogen C. Hydrogen, chlorine, and carbon D. Hydrogen, fluorine, and carbon
D
How does the global warming potential of R-410A compare to carbon dioxide? A. It is lower. B. They are equal. C. It is hundreds of times greater. D. It is thousands of times greater.
D
How would you remove moisture from refrigerant in a system? A. Purge the condenser B. Drain the oil separator. C. Reduce water flow to the condenser D. Use a filter drier.
D
Identify the best method to charge a system that has both an air-cooled condenser and evaporator with a nameplate charge of 80 pounds. A. Vapor charge through the suction service valve B. Liquid charge through the discharge service valve C. Liquid charge through the suction service valve D. Liquid charge through the liquid-line service valve
D
It is best practice to use dry nitrogen to break the vacuum when dehydrating by the triple evacuation method. However, it: A. often contains moisture. B. requires a minimum of 10 psig C. is toxic when released into the atmosphere. D. requires a pressure regulator.
D
Recovered refrigerant may contain which of the following impurities? A. Ammonia, carbon dioxide, and methyl chloride B. Sodium chloride, potassium nitrate, and silicone oil C. Sulphur dioxide and methane D. Acids, moisture, and oil
D
What evidence demonstrates that chlorine in the stratosphere is primarily from man-made chemicals rather than from natural sources such as volcanoes? which has different natural sources than chlorine, over the same period. A. The rise in the amount of chlorine measured in the stratosphere matches the rise in the amount of fluorine, same period. over erupting volcanoes show that volcanoes contribute a small B. The rise in the amount of chlorine measured in the stratosphere matches the rise in ODS emissions over the quantity of chlorine to the stratosphere C. Samples of air taken from the stratosphere compared to CFCS and HCFCS. D. All of the listed reasons.
D
What is unique about an azeotropic refrigerant mixture? A. It is a mixture of refrigerants that is easily made. B. It has a pressure temperature curve identical to one of its components. C. It may not be charged in the vapor phase and must only be charged in the liquid phase. D. It is a mixture that acts like a single component refrigerant over its entire temperature range.
D
What should be done before transferring refrigerant to an empty cylinder? A. The refrigerant should be chilled. B. The refrigerant should be mixed. C. The cylinder should be heated. D. The cylinder should be evacuated.
D
What steps should be taken before using a recovery unit to remove a charge? A. The refrigerant should be tested for acid. B. The recovery is unit should be purged with nitrogen. C. The recovery unit oil should be changed and recovery cylinder evacuated. D Service valve positions and recovery oil level should be checked, when applicable.
D
When first inspecting a hermetic system known to be leaking, you should look for: A. frost on the tubing B. puddles of refrigerant C. particles of filter drier core D. traces of oil
D
Which factor does NOT affect the speed of evacuation? A. The size of the equipment being evacuated. B. The ambient temperature. C. The amount of moisture in the system. D. The brand of micron gauge used.
D
Which of the following CANNOT be used as a reason to extend the appliance repair deadlines? A. Requirements of federal, state, or local regulations make the repair within 30 days impossible. B. A necessary component is not available C. The appliance is located in an area that is subject to radiological contamination. D. A certified service technician is not available.
D
Which of the following refrigerants has the lowest global warming potential? A. R-134a B. R-407C C. R-410A D. R-600a
D
Your recovery/recycling machine has R-22 refrigerant in it. You now have to recover refrigerant from an R-410A unit. What must be done before recovery? A. Change the recovery cylinder on the recovery machine. B. Change the expansion valve on the recovery machine. C. Change the filter and expansion D. Remove the R-22 from the recovery unit and change the filter.
D
Which type of refrigerant typically has the lowest global warming potential? HCFCs HFOs HFCs All are equal
HFOs
What is the state of the refrigerant entering the compressor of a refrigeration system? A. Low pressure liquid B. Low pressure vapor C. High pressure liquid D. High pressure vapor
Low pressure vapor
What does Section 608 certification allow a technician to do? A. Import R-22 from overseas. B. Purchase or handle controlled refrigerants. C. Service motor vehicle air conditioners. D. Perform any type of work on any type of HVACR equipment.
Purchase or handle controlled refrigerants.
Which word applies to the process that returns refrigerant to new product specifications and that requires chemical analysis? A. Recovery B. Recycle C. Reprocess D. Reclaim
Reclaim
Which of the following is NOT recommended safety practice when operating refrigerant recovery or recycling equipment? A. Wear safety glasses. B. Wear protective gloves. C. Follow all safety precautions for the equipment. D. Remain at least 5 feet away from any operating equipment.
Remain at least 5 feet away from any operating equipment.
Why are HFO refrigerants less flammable than hydrocarbon refrigerants? A. They contain chlorine. B. They contain bromine. C. They contain fluorine. D. They contain carbon.
They contain fluorine.