EPA 1
After reaching the required recovery vacuum on an appliance you should a) immediately disconnect the recovery or recycling equipment and open the system for service b) wait for at least a few minutes to see if the system pressure rises indicating that there is still refrigerant in the liquid form or in the oil c) immediately break the vacuum with nitrogen and open the system for service d) immediately pressurize the system with nitrogen and perform a leak check
b
EPA regulations require that all appliances containing more than 50 lbs of refrigerant (except for commercial and industrial process refrigeration) be repaired when the leak rate exceeds ______ percent of the charge per year a) 0 b) 15 c) 25 d) 35
b
EPA rules require capture of 80% of the refrigerant from a small appliance sealed system with a non-operating compressor if technicians are using a) a system dependent (passive) process b) a self-contained (active) process c) Either recovery process d) neither recovery process
b
For accurate readings during evacuation, the system vacuum gauge should be connected a) at the pump discharge b) as far from the vacuum pump as possible c) directly to the pump suction d) anywhere in the evacuation service hose
b
If EPA regulations change after a technician becomes certified a) The technician certification is grandfathered for one year to allow time to recertify b) It will be the technicians responsibility to comply with any future changes in the law c) a new certification test must be taken to be recertified d) Both A and C
b
Many refrigeration units use an open compressor. Which part of the compressor is most likely to leak if a unit is not used for several months a) The suction service valve b) The rotating shaft seal c) The oil drain plug d) The discharge service valve
b
Recovering refrigerant from a system in vapor phase will minimize loss of a) water b) oil c) refrigerant d) all the above
b
Removing refrigerant in any condition from a system and storing it in an external container without any necessarily testing or processing it in any way defines a) recycling b) recovering c) reclaiming d) restoring
b
When a new system has been assembled (built up) and is ready for testing the first thing to do is a) pull a vacuum b) pressurize with an inert gas and leak check c) Pressurize with the refrigerant to be used in the system d) Introduce an initial charge of refrigerant and start the compressor
b
When recovering refrigerant, it is important not to mix different refrigerants in the same container because a) the mixture would explode b) The mixture may be impossible to reclaim c) the refrigerant mixture is toxic d) it is a violation of EPA environmental regulations
b
When transporting cylinders containing used refrigerant, DOT requires that you a) Use OSHA approved containers b) attach DOT classification tags c) Ship by EPA certified carrier d) Do all the above
b
When using recovery and recycling equipment manufactured before November 15 1993 technicians must evacuate an appliance containing 10 lbs of CFC-500 to the following level before disposing of the appliance a) o psig b) 4 in Hg vacuum c) 10 inches of Hg vacuum d) 15 inches of Hg vacuum
b
You are going to service a residential split system providing comfort air conditioning. You would expect to find what type of refrigerant a) R-502 b) R-22 c) R-11 d) R-12
b
Refrigerants (i.e. R-12, R-22, R-500 etc.) in large quantities can cause suffocation because a) They smell strong and make breathing difficult b) They are lighter than air and cause dizziness c) They are heavier than air and displace oxygen d) They sting the nose and cause sneezing
c
The ozone layer protects the earth from a) nuclear radiation b) meteorites c) ultraviolet radiation from the sun d) infrared radiation from the sun
c
When checking for non-condensables inside recovery cylinder, why should the technician allow the temperature of the cylinder to stabilize to room temperature before taking a pressure reading a) To prevent safety valves from puging refrigerant b) It is a quick method of determining a refrigerant level inside the tank c) Comparisons to a pressure temperature chart are only valid if both the pressure and temperature of the refrigerant are stable and known d) A temperature reading alone is enough to determine refrigerant quality
c
When is it essential to take measures to help release trapped refrigerant from the compressor oil during refrigerant recovery a) When using self contained (active) recovery devices b) When using system dependent (passive) recovery devices c) When using (passive) recovery devices on small appliances with non-operating compressors d) when the refrigerant has a low side leak
c
When servicing a small appliance for leak repair a) it is mandatory to repair the leak within 30 days b) It is mandatory to repair the leak only when 35% of the charge escapes within a 12 month period c) It is not mandatory to repair the leak but do so whenever possible d) Both a and b
c
When using a system dependent (passive) recovery process on operating compressors, technicians should a) run the appliances compressor on 240 V while recovering the refrigerant from the capillary tube b) Run the appliances compressor for several minutes shutting it off and then recovering the refrigerant from the high side c) run the appliances compressor and recover the refrigerant from the high side d) Run the appliances compressor for several minutes shutting it off and then recovering the refrigerant from the low side
c
Which of the following is an indicator of a leak in a high pressure system a) high head pressure b) low water temperature c) excessive superheat d) frequent purging
c
Which of the following refrigerant will not damage stratospheric ozone a) CFCs b) HCFCs c) HFCs d) Both a and b
c
With an air cooled condenser on the roof of a building and the evaporator on the first floor, recovery should first occur a) from the vapor line entering the condenser b) from the discharge of the compressor c) from the liquid line entering the evaporator d) on the suction side of the compressor
c
A hermetic compressor must never be operated when a) the system is under full load b) the system is drawing full load amperes c) the outdoor temperature is above 105 F d) there is a dehydration vacuum in the system
d
A storage cylinder of recovered R-22 at normal room temperature (about 75 F) in the absence of non-condensables will be pressurized to a) 250 psig b) 200 psig c) 175 psig d) 130 psig
d
All devices used for refrigerant recovery must a) be portable b) contain a heavy duty shield c) have a 20,000 BTU/hr rating d) meet EPA standards
d
EPA regulations include which of the following in the definition of a "small appliance" a) Products manufactured, charged and hermetically sealed in a factory b) Products having 5 pounds or less of refrigerant c) Products with compressors under 1/2 horsepower d) Both a and b
d
EPA regulations require that leaking commercial and industrial process refrigeration be repaired when the leak rate exceeds _____ percent of the charge per year a) 0 b) 15 c) 25 d) 35
d
Hydrofluorcarbon (HFC) refrigerants contain a) Chlorine Fluorine and Carbon b) Chlorine Fluorine and Carbon c) Hydrogen Chlorine and Carbon d) Hydrogen, Fluorine and Carbon
d
If a reclamation facility receives a tank of mixed refrigerant, they may a) refuse to process the refrigerant and return it at the owners expense b) agree to destroy the refrigerant but typically a substantial fee is charged c) resell the refrigerant for reuse in its current state d) both a and b
d
Ozone depletion in the stratosphere is what type of problem a) Local b) Regional c) National d) Global
d
Recovered refrigerant may contain which of the following a) acids b) moisture c) oils d) All the above
d
Service technicians who violate Clean Air Act Provisions a) may be fined b) may lose certification c) may be required to appear in federal court d) All the above
d
Some state and local governments may establish laws that a) Follow the Clean Air Act/EPA regulations b) Are not as strict as the Clean Air Act/EPA regulations c) Contain stricter regulations than the Clean Air Act/EPA regulations d) Both A and C
d
The component of a refrigeration system which changes a high pressure vapor to a high pressure liquid is a) receiver b) metering device c) accumulator d) condenser
d
The sale of CFC and HCFC refrigerants is a) Banned b) limited by law to equipment owners c) Allowed only if there is proof of need d) restricted to technicians who are EPA certified in refrigerant recovery
d
The system dependent (passive) recovery process for small appliances a) never needs the use of a pump or heat to recover refrigerant b) must use a pressure relief device when recovering refrigerant c) Captures refrigerant in a non-pressurized container d) can only be performed on a system with an operating compressor
d
Using the system dependent (passive) recovery process, which condition requires the accessing both the high and low side of the system for refrigerant recovery a) When there is a leak in the system b) When the compressor operates normally c) When the compressor only runs at half speed d) When the compressor does not run
d
What chemical in the upper stratosphere indicates that the upper ozone layer is being destroyed a) Carbon Monoxide b) Nitrous Oxide c) Trioxide d) Chlorine Monoxide
d
When R-500 is recovered from an appliance it a) Can be mixed with either R-22 or R-12 during the recovery process, since R-500 is actually a mixture of the two refrigerants b) Can be mixed with R-12 but not R-22 during the recovery process c) need not be recovered since R-500 is not one of the refrigerants covered by the Clean Air Act d) Must be recovered into its own recovery vessel that is clearly marked to ensure that mixing of refrigerants does not occur
d
When a household refrigerator compressor does not run, it is recommended that low and high side access valves be installed when recovering refrigerant from the system because a) It can enhance the speed of recovery b) It may be necessary to achieve required recovery efficiency c) otherwise the refrigerators compressor may be damaged d) both a and b
d
When operating refrigerant recovery or recycling equipment, the following precautions should be followed a) Wear safety glasses b) Wear protective gloves c) Follow all safety precautions for the equipment d) all the above
d
When using recovery and recycling equipment manufactured after November 15 1993 technicians must evacuate an appliance component containing more than 200 lbs of CFC 12 to the following level before making a major repair a) 0 psig b) 4 inches of Hg vacuum c) 10 inches of Hg vacuum d) 15 inches of Hg vacuum
d
When using recovery cylinders and equipment with schraeder valves, it is critical to a) Inspect the schraeder valve core for bends and breakage b) Replace the schraeder valve core to prevent leakage c) Cap the schraeder ports to prevent accidental depression of the valve core d) all the above
d
When using vapor recovery, the fill level of the cylinder can be controlled by a) mechanical float devices b) electronic shut off devices c) weight d) All the above
d
Which of the following statements is not true of recycling and recovery equipment manufactured after November 15 1993 a) It must be tested by an EPA approved 3rd party b) It must meet vacuum standards more stringent than those met by equipment manufactured before November 15, 1993 c) it must be equipped with low loss fittings d) it must have an oil separator
d
Which refrigerant can be mixed a) R11 and R12 b) R12 and R134a c) R12 and R22 d) none of the above
d
Which refrigerant(s) must be recovered before opening or disposing of appliances a) R-12 b) R-22 c) R-500 d) all the above
d
Your recovery/recycling machine has R502 refrigerant in it. You now have to recover refrigerant from a unit with R22. What must be done before the R22 refrigerant can be recovered/recycled a) Nothing, as long as the recovery machine is not full b) change the expansion valve on the recovery machine c) change the filter and expansion valve on the recovery machine d) Recover as much of the of the R502 from the recovery unit as possible, change filter and evacuate
d
what effects can ozone depletion have on the environment a) reduced crop yields b) Reduced marine life c) Increased ground level ozone d) All the above
d
After 1995 supplies of CFC refrigerant for equipment servicing will come from a) recovery and recycling b) solvent conversion c) european chemical manufacturers d) Third world chemical manufacturers
a
Any person who opens an appliance for maintenance service or repair must have at least one self-contained recovery machine available at their place of business. The exception to this rule are persons working on a) small appliances b) low pressure appliances c) high pressure appliances d) very high pressure appliances
a
Chlorofluorcarbons (CFCs) and hydrochlorfluorocarbons (HCFCS) have which of the following in common a) they have the same ozone depletion potential b) They both contain hydrogen c) They must be recovered before opening or disposing of appliances d) They have the same saturation pressure at 70 F
a
Every refrigerating system shall be protected by a) a pressure relief valve b) a properly located stop valve c) a low pressure control d) a refrigerant receiver
a
If a system is opened for servicing which of the following should be replaced a) Filter drier b) thermostat c) metering device d) crankcase heater
a
Portable refillable tanks or containers used to ship CFC or HCFC refrigerants obtained with recovery equipment must meet what standard(s) a) Department of transportation b) Community Right-to-Know Act c) Underwriters Laboratories d) All the abover
a
Recovery equipment that relies upon the compressor in the appliance and/or the pressure of the refrigerant in the appliance would be considered a) system-dependent b) self-contained c) a packaged terminal unit d) self sufficient
a
Technicians receiving a passing grade on this small appliance examination are certified to recover refrigerant during the maintenance, service or repair of a) packaged terminal air conditioners (PTACs) with 5 pounds or less of refrigerant b) small central air conditioning systems with 10 pounds or less of refrigerant c) low pressure equipment d) motor vehicle air conditioning equipment
a
The refrigerant pressure of an R12 machine at room temperature (72 F) while the machine is idle is a) 75 psig b) 150 psig c) 212 psig d) 300 psig
a
The synthetic lubricant presently used with ternary blends containing HCFCs is a) alkylbenzene b) glycols c) esters d) whale oil
a
When installing any type of access fitting onto a sealed system a) The fitting should be leak tested before proceeding with recovery b) It is not necessary to leak test an access fitting c) The fitting need not be leak tested until the total repair is completed d) The system must be pressurized with dry nitrogen before leak testing can be attempted
a
When using nitrogen in repairing a sealed refrigeration system, the nitrogen tank should always be equipped with a a) regulator b) float sensor c) red top d) hand valve
a
Which of the following is not a type I appliance a) An MVAC like system that holds 3 pounds of R12 b) A water cooler that holds 13 ounces of R-12 c) A food freezer that holds 22 ounces of R-22 d) A dehumidifier with 7 ounces of R-500
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 Dryer c) Replacement of a Schraeder valve core d) Replacement of a Condenser Fan Motor
a
Which refrigerant is a chlorine free refrigerant a) HFC-134a b) CFC-12 c) HCFC-22 d) HCFC-124
a
You are sent out to service a 60 ton packaged roof top unit. The easiest way to check the type of refrigerant it uses is to a) look at the unit name plate b) use your service gauge set and a refrigerant card c) ask the owner d) determine the condenser size
a
A refrigerant oil that is hygroscopic a) is a good lubricant b) is crude and unrefined c) readily absorbs moisture d) can be left open the ambient air
c
A storage cylinder of recovered R-500 at normal room temperature (about 75 F) in the absence of non-condensables will be pressurized to a) 30 psig b) 75 psig c) 95 psig d) 120 psig
c
Appliances containing CFC refrigerants can be evacuated to atmospheric pressure when a) the repair is major b) The repair is followed by an evacuation of the appliance to the environment c) Leaks in the appliance make evacuation to the prescribed level unattainable d) the appliance is being disposed
c
If a system will not hold a vacuum after it has been evacuated then a) the system is ready to be charged b) the system has been adequately evacuated c) The system may be leaking d) The expansion valve is clogged
c
Persons recovering refrigerant during maintenance service of repair of small appliances must be certified as a) Type II technician b) Type III technician c) Type I technician or Universal technician d) All the above
c
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) can probably be charged back in the system b) should probably be replaced with R123 c) must be reclaimed d) must be destroyed
c
You are changing out a compressor of a system containing 40 lbs R502. Your recycling equipment was manufactured after November 15 1993. In addition to isolating the compressor as much as possible, which of the following procedures must you follow a) Simply remove the compressor b) Evacuate the isolate section of the system to atmospheric pressure, then remove the compressor c) Evacuate the isolated section of the system to 10 inches of vacuum and hold. If the system pressure does not rise remove the compressor d)Evacuate the isolated section of the system to 15 inches of vacuum and hold. If the system pressure does not rise remove the compressor
c
You can save time recovering the refrigerant from a system by removing as much as possible in the _________ phase a) final b) initial c) liquid d) vapor
c
