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R-11 and R-123 refrigerants are:
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If excessive nitrogen pressure is exerted within a low pressure chiller, what component fail first?
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epa tests
epa 3
| Question | Answer |
|---|---|
| R-11 and R-123 refrigerants are: | 1) oxygen depleting 2) Heavier than air 3) Are class I and II substances as defined by EPA |
| If excessive nitrogen pressure is exerted within a low pressure chiller, what component fail first? | Rupture disk |
| Refrigerant vapor is charged into a low pressure chiller initially to prevent: | water freeze up caused by system vacuum |
| Machine room safely standards have been established by: | ASHRAE 15 |
| Before a low pressure appliance is dismantled and salvaged: | The refrigerant must be recovered |
| The purge unit draws from the: | Top of the condenser |
| The rupture disk of a low pressure chiller is connected to the: | low side |
| Low pressure chillers require purge units because: | 1) They operate below atmospheric pressure 2) They draw non-condensables through gaskets and seals |
| Under ASHRAE Standard 15, what refrigerant requires equipment room sensors? | R-123 |
| Under ASHRAE Standard 15, the following refrigerants require equipment room oxygen deprivation sensors: | 1) R-11 2) R-12 3)R-134a |
| R-123 is classified as a ____ under ASHRAE 34 standard safety group: | B1 |
| R-134a is classified as a _____ under ASHRAE 34 standard safety group: | A1 |
| A low pressure chiller providing comfort cooling that has an annual leak rate of ____% of the total charge must be repaired: | 15 |
| To prevent freezing of the water coils of a low pressure chiller, it is recommended that: | 1) When charging, begin with vapor phase 2) Circulate water through the chiller 3) Do not inject liquid during charging until saturation temperature is above 32 degrees |
| A low pressure chiller generally has the rupture disk set at: | 15 psig |
| The required evacuation level for recovering refrigerant from a low pressure appliance with a recovery machine manufactured after November 15,1993 is: | 1) 25 mm Hg absolute 2) 29 inches Hg |
| The required evacuation level for recovering refrigerant from a low pressure appliance with a recovery machine manufactured before November 15, 1993 is: | 25 inches Hg |
| Water tube leaks in a low pressure chiller are usually found with: | A hydrostatic tube test |
| The short term replacement refrigerant for R-11 chillers is: | R-123 |
| The maximum pressure that should be applied to a low pressure chiller when leak checking with controlled nitrogen is: | 10 psig |
| Type III certification as classified by EPA is for: | Low pressure appliances |
| Which refrigerant is a CFC and has been used with low pressure appliances? | R-11 |
| Recovery cylinders are color coded: | Gray with yellow tops |
| Frost would be best removed from a sight glass by: | Spraying with alcohol |
| Recovery machines using water as the condensing medium would generally use the: | Municipal water supply |
| At room ambient temperature of 80 degree F., the pressure of a cylinder containing R-22 will be approximately: | 143 psig |
| One of the easiest ways to identify the type of refrigerant in a system is to: | Check the name plate data |
| R-134a is a drop replacement refrigerant for: | It is not a drop in replacement |
| Non-condensibles in an air conditioning or refrigeration system will: | 1) Tend to stay in the top of the condenser 2) Increase the high side pressure 3) May be purged with a recovery machine |
| Deep vacuums used for evacuation and dehydration of systems are measured in | Microns |
| The condition and state of refrigerant leaving the accumulator of a system is: | Superheated low pressure vapor |
| The condition and state of refrigerant entering the receiver is: | Subcooled high pressure liquid |
| System-dependent recovery equipment is limited to appliances containing less than ___pounds of refrigerant: | 15 |
| The refrigerant you would expect to find in a split air conditioning system manufactured before 1995 would be: | R-22 |
| The generally accepted rule for maximum liquid filling of cylinders is: | 80% |
| Exceptions to the required evacuation levels for recovery equipment that require an appliance be evacuated to only 0 psig apply to appliances that: | Are filled with water or substances that would damage the recovery equipment |
| A major repair is defined by EPA, as replacing the: | 1) Compressor 2) Evaporator |
| It becomes the owners responsibility to maintain records of all refrigerant added to units that contain more than ___pounds of refrigerant charge | 50 |
| The majority of the liquid to be recovered from a system will be found in the: | Receiver (when applied) |
| Recovery time can be shortened by: | 1) Recovering as much liquid as possible in the initial stages 2) Using short hoses 3) Cooling the recovery tank in ice water |
| Comfort cooling chillers and all other equipment with an annual leak rate of ____% requires repair under EPA regulations: | 15 |
| Industrial process and commercial refrigeration equipment with an annual leak rate of ____% requires repair under EPA regulations: | 35 |
| The required level of evacuation for recovery equipment manufactured after November 15, 1993, on a system containing less than 200 pounds of R-12 refrigerant is: | 10 inches Hg |
| The required level of evacuation for recovery equipment manufactured after November 15, 1993, on a system containing less than 200 pounds of R-22 refrigerant is: | 0 inches Hg |
| The required level of evacuation for recovery equipment manufactured before November 15, 1993, on a system with an R-22 charge of less than 200 pounds is: | 0 inches Hg |
| Front seating the three-way suction service valve close the: | Suction inlet to the valve |
| Type II classification, as identified by EPA, applies to what equipment? | Split air conditioning equipment with five (5) pounds of refrigerant and greater |
| A condition of excessive superheat at the evaporator outlet and compressor inlet of an air conditioning system could be an indication of | Low on refrigerant charge |
| Traces of oil around the sight glass inlet fitting of a refrigeration system might be the indication of | A leak |
| Which refrigerant can be used for leak detection as a trace gas and pressurized with nitrogen | R-22 |
| Which refrigerant is considered a long-term replacement for CFC (R-12) in small appliance? | R-134a |
| Disposable refrigerant cylinders should be disposed of by: | Rendering useless and sent to salvage |
| Which refrigerant have a "0" ODP? | HFCs |
| Packaged terminal heat pumps with less than five (5) pounds of refrigerant must be serviced by certified: | Technicians with Type I |
| The required aperture typically found on small appliance systems is: | The process stub |
| To work on small appliances after November 14, 1993, a technician must be certified as: | Type I and Universal |
| The law states that leaks in small appliances: | Do not have to repaired, but should be repaired |
| CFCs have been manufactured in the United States since: | 1995 |
| Line tapping and piercing valves should always be removed from systems after the repairs are completed because: | The Neoprene gaskets will eventually fail causing a leak |
| Nitrogen used for brazing processes, holding charges, or leak checking: | May be vented to the atmosphere |
| A nitrogen tank should always be equipped with a: | Pressure regualtor |
| CFC and HCFC refrigerants can cause suffocation because: | They are heavier than air and displace oxygen |
| Which of the following refrigerants can be mixed? | None of refrigerants can be mixed |
| A system has been operating with a complete restriction at the capillary tube inlet, what access is required for recovery? | One access valve on the high side of the system |
| Hydrochloric and hydrofluoric acids are | 1) Caused from CFCs or HCFCs in the presence of moisture being exposed to high heat 2) Damaging to the windings found in hermetic refrigeration and air conditioning systems 3) To be avoided when handling with bare hands |
| Before disposing of a small appliance containing R-12, it is necessary to: | Recover the refrigerant |
| Mixed refrigerants that are sent to reclaim centers: | Will be disposed of at the owners expense |
| System depend (passive) refrigerant recovery of small appliances: | 1) Do not require operating compressor 2) Requires 80% of the refrigerant to be recovered 3) Recovers refrigerant in a non-pressurized container |
| Containers of refrigerant r-134a are color coded: | Light blue |
| Should regulations of the Clean Air Act (CAA) change after a technician certified: | It will be the technician's responsibility to learn and comply with future changes in the law |
| The release of vapor from the top of a graduated charging cylinder, when filling, may: | Not be vented and must be recovered |
| The sale of class I and Class II refrigerants have been restricted to technicians certified by an EPA approved program since: | November 14, 1993 |
| For small appliance use, the recovery equipment manufactured after November 15, 1993 must be capable of recovering: | 1) 80% of the refrigerant when the compressor is not operating or achieve a 4 inch vacuum under ARI 740-1993 2) 90% of the refrigerant when the compressor is operating or achieve a 4 inch vacuum under ARI 740-1993 |
| Which best describes the definition of Type I "small appliance" as defined by EPA? | Systems manufactured, charge and hermetically sealed with five (5) pounds or less of refrigerant |
| For the maintenance, service or repair of small appliances, recovery equipment manufactured after _____must be certified by an EPA approved organization. | November 15, 1993 |
| Refrigerant cylinders should be shipped: | In the vertical upright position |
| The component of an air conditioning system that changes a low pressure vapor to a high pressure vapor is the: | compressor |
| The condition and state of the refrigeration leaving a receiver is: | Subcooled liquid |
| The refrigerant condition and state entering the condenser of a air condition | Superheated vapor |
| R-134a is "drop-in" refrigerant for: | R-134a in not a drop-in refrigerant |
| The synthetic lubricant used with most HCFC based blends is: | Alkylbenzene |
| The process that reduces contaminants in used refrigerant by oil separation with single and multiple passes through devices such as replaceable filter core driers, which reduce moisture, acidity, and particulate matter is: | Recycling |
| To RECOVER refrigerant is to: | Remove refrigerant in any condition from a system in either an active or passive manner, and store it in an external container without necessarily testing or processing |
| A system that fails to hold a vacuum after t____nation process: | May contain moisture and May have leak |
| The time it takes to properly evacuate and dehydrate a system prior to charging with refrigerant is determined by the: | 1) Total volume of the system 2) Amount on non-condesibles (moisture) in the system 3) Ambient temperature |
| The rule of thumb for refilling approved cylinders is a maximum of ____percent liquid? | 80% |
| One time (disposable) refrigerant cylinders are used for: | Virgin refrigerant |
| The following actions would violate the Clean Air Act (CAA) | 1) Knowing releasing Class I and Class II substances 2) Failing to keep or falsifying required records 3) Failing to reach the required evacuation levels before opening a system to the atmosphere for service |
| The molecule that indicates stratospheric ozone depletion is taking place is: | Chlorine monoxide |
| Which refrigerant contain no chlorine | R-134a |
| Which refrigerants is a HFCs? | R-134a |
| Which refrigerants is a HCFCs? | R-123 and R-22 |
| Which refrigerant is a CFCs? | R-12 |
| The gas in the stratosphere that protects us from ultraviolet radiation is: | ozone |
| Stratospheric ozone depletion is a ______ problem: | Global |
| Stratospheric ozone consists of: | Three oxygen |
| The molecule found in CFC and HCFC refrigerants that destroys ozone in the stratosphere is: | Chlorine |
| Which refrigerants have the lowest ozone depletion potential (ODP)? | HFCs |
| As of what date did it become unlawful to release Class I and Class II refrigerants to the atmosphere? | July 1, 1992 |
| Which refrigerants contain the most chlorine | CFCs |
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