Mr. Morgan HVAC/R Instructor Section 608 Certification Pre-Test
Before you dispose of any appliance containing a CFC or HCFC refrigerant, you must; A: recover the refrigerant. B: purge the appliance with nitrogen. C: flush the appliance with R-11. D: seal the appliance so no refrigerant can escape.
HCFC refrigerants are; A: more harmful to stratospheric ozone than CFCs. B: as harmful to stratospheric ozone as CFCs. C: less harmful to stratospheric ozone than CFCs. D: not harmful to stratospheric ozone.
An award of up to what amount may be paid to a person supplying information that leads to a penalty against a technician who is intentionally venting? A: $5,000. B: $10,000. C: $25,000. D: $50,000.
Ozone in the stratosphere above the earth consists of; A: molecules containing 3 oxygen atoms. B: molecules of 2 oxygen atoms. C: radioactive particles. D: pollutants that have risen from ground level.
Which compounds have the highest ozone depletion potential (ODP)? A: HCFCs. B: HFCs. C: CFCs. D: All are equal.
Each chlorine atom in the stratosphere can destroy ______ ozone molecules. A: 1 B: 3 C: 100,000 D: Chlorine is not the element in refrigerant that harms ozone.
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 of the above.
What effects can ozone depletion have on the environment? A: Reduced crop yields. B: Reduced marine life. C: Increased ground-level ozone. D: All of the above.
Which of the following CFC or HCFC refrigerant releases is considered a violation of the prohibition on venting? A: Release of "de minimis" quantities in the course of making good faith attempts to recapture and recycle or safely dispose of refrigerant. B: Release of mixtures of nitrogen and refrigerant that result from adding nitrogen to a fully charged appliance to leak-check the appliance. C: Refrigerants emitted in the course of normal operation of an appliance. D: Refrigerants emitted when connecting or disconnecting hoses to charge or service an appliance.
What characteristic(s) of CFCs make them more likely to reach the stratosphere than most other compounds containing chlorine? A: CFCs neither dissolve in water nor break down into compounds that dissolve in water, so they do not rain out of the atmosphere. B: CFCs are lighter than other chlorine compounds, making it easier for them to float upward when released. C: CFCs are stored under pressure, causing them to jet upward when released. D: CFCs are attracted to ultraviolet radiation.
The Clean Air Act; A: calls for the phase out of CFC/HCFC production. B: prohibits venting of CFC and HCFC refrigerants and their substitutes. C: requires EPA to set standards for recovery of refrigerants prior to appliance disposal. D: All of the above.
Which atom of the CFC molecule causes ozone depletion? A: Fluorine. B: Chlorine. C: Carbon. D: Hydrogen.
Manufacturers often color code the exterior of gauges. On a typical gauge manifold set, the high pressure gauge is color coded; A: green. B: yellow. C: blue. D: red.
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: an expansion valve is clogged.
The piping connection to the vacuum pump should be; A: as short in length and as large in diameter as possible. B: suitably sized to connect to a gauge manifold. C: coiled and taped together. D: colored red or blue to meet codes.
Refrigerant entering the compressor of a refrigeration system is a; A: liquid B: sub-cooled liquid C: sub-cooled vapor D: superheated vapor
Which of the following is an approved "drop-in" service replacement for R-12? A: HFC-134a. B: HFC-125. C: CFC-502. D: None of the above.
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".
How should refrigerant cylinders be positioned when they are shipped? A: Inverted. B: Upright. C: Horizontally. D: Stacked.
Chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (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
Under what conditions may you use a disposable cylinder to recover refrigerant? A: When the system contains the same refrigerant as the cylinder. B: When the system contains less than 10 lbs. of refrigerant. C: Only in an emergency. D: Never.
Why shouldn't technicians use oxygen or compressed air to pressurize appliances to check for leaks? A: When mixed with compressor oil or some refrigerants, either oxygen or compressed air can cause an explosion. B: Leaking oxygen or compressed air is difficult to detect. C: The pressures produced by either oxygen or compressed air are not acceptable. D: Neither oxygen nor compressed air mix well with refrigerants.
The oils that will be employed with most of the HFC-134a refrigeration applications are; A: esters. B: alkylbenzenes. C: whale oils. D: All oils are compatible with HFC-134a.
Long hoses between the unit and the recovery machine should be avoided as they cause; A: excessive pressure drop. B: increased recovery time. C: increased emissions. D: All of the above.
Removing refrigerant in any condition from a system and storing it in an external container without necessarily testing or processing it in any way defines; A: recycling. B: recovering. C: reclaiming. D: restoring.
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.
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.
Recovery equipment used during maintenance, service or repair of small appliances must be certified by an EPA-approved laboratory if manufactured AFTER: A: July 1, 1992. B: July 1, 1993. C: May 13, 1993. D: November 15, 1993.
When checking for non-condensables inside a 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 purging refrigerant. B: It is a quick method of determining 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.
A standard vacuum pump designed specifically for evacuation and dehydration can; A: be used alone as a self-contained (active) recovery device. B: never be used as a recovery device in combination with a pressurized container. C: be used alone as a substitute for any recovery device. D: be used alone as a system-dependent (passive) recovery device.
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".
When recovering refrigerant into a non-pressurized container from a refrigerator with an in operative compressor; A: It is necessary to heat the compressor and strike it with a rubber mallet. B: It is only necessary to recover as much refrigerant as will naturally flow out of the system. C: It is not necessary to recover since the refrigerant is probably contaminated. D: It is necessary to chase refrigerant from the oil with pressurized dry nitrogen.
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.
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.
Which of the following is NOT a Type I appliance? A: An MVAC-like system that holds three pounds of R-12. 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 seven ounces of R-500.
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".
If EPA regulations change after a technician becomes certified; A: the technician certification is "grand fathered" for one year to allow time for re-certification. B: it will be the technician's responsibility to comply with any future changes in the law. C: a new certification test must be taken to be re-certified. D: Both "A" and "C".
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 PA certified in refrigerant recovery.
A storage cylinder of recovered R-22 at normal room temperature (about 75 degrees F), in the absence of non-condensables, will be pressurized to; A: 250 psig. B: 200 psig. C: 175 psig. D: 130 psig.
Before beginning a refrigerant recovery procedure it is ALWAYS necessary to; A: allow the appliance to stabilize at room temperature. B: know the type of refrigerant that is in the system. C: remove the appliance to an outdoor location. D: disconnect the appliance from its power source.
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.
It is generally recommended that piercing-type valves be used on which of the following tubing materials? A: Copper B: Aluminum C: Steel D: Both "A" and "B"
If a reclamation facility receives a tank of mixed refrigerant, they may; A: refuse to process the refrigerant and return it at the owner's 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".
If a large leak of refrigerant occurs such as from a filled cylinder in an enclosed area, what action should be taken when no self-contained breathing apparatus is available? A: Use butyl lined gloves and try to stop the leak. B: Use a leak detector to locate the leak and try to stop the leak. C: Vacate and ventilate the spill area. D: All of the above.
A storage cylinder of recovered R-500 at normal room temperature (about 75 degrees F), in the absence of nun-condensables, will be pressurized to; A: 30 psig. B: 75 psig. C: 95 psig. D: 120 psig.
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 refrigerator's compressor may be damaged. D: Both "A" and "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.
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 of the above.