Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
EPA 2
PRACTICE TEST
| Question | Answer |
|---|---|
| which refrigerants contain the chlorine? | CFCs |
| As of what date did it become unlawful to intentionally release Class I and Class II refrigerants into the atmosphere | July 1, 1992 |
| Which refrigerants have the lowest ozone depletion potential? (ODP)? | HFCs |
| The moelcule found in CFC and HCFC refrigerants that destroys ozone in the atmosphere is: | chlorine |
| Stratospheric ozone consists of | three oxygen atoms |
| Stratospheric ozone depletion is a_____problem. | global |
| The gas in the stratosphere that protects the earth from ultraviolet radiation is: | ozone |
| Which refrigerant is a CFC? | R-12 |
| Which refrigerant is a HCFC? | R-22 |
| Which refrigerant is an HFC? | R-134a |
| Which refrigerant contains no chlorine? | R-134a |
| The molecule found in the stratosphere that indicates that ozone depletion is taking place is: | chlorine monoxide |
| Which of the following would violate the Clean Air Act (CAA) | 1) knowingly releasing Class I or Class II substances 2) failing to keep or falsifying records 3) failing to reach required evacuation levels before opening a system a system for service |
| One time (disposable) refrigerant cylinders are used for | virgin refrigerant |
| The maximum safe fill level of a refrigerant cylinder is _______ % liquid | 80 |
| The time it takes to properly evacuate and dehydrated refrigeration system is determined by: | 1) the total volume of the system 2) the amount of non-condensables in the system 3) the ambient temperature |
| A system that fails to hold a vacuum after the evacuation process: | 1) may contain moisture 2) may have a leak |
| To RECOVER refrigerant is to: | remove the refrigerant from a system in any condition and store it in an external container without necessarily processing or testing |
| The process that reduces contaminants in used refrigerant by oil separation and single or multiple passes through devices such as replaceable filter core driers which reduce moisture, acidity and particulate matter is called: | recycle |
| The synthetic lubricant used with HCFC based ternary blends is | alkyl-benzene |
| HFC-134a is a drop-in replacement for | HFC-134a is not a drop-in refrigerant |
| The state and condition of the refrigerant entering the condenser is a: | superheated vapor |
| The state and condition of the refrigerant leaving the condenser is a: | subcooled liquid |
| The component of a refrigeration system that changes a low pressure vapor into a high pressure vapor is the: | compressor |
| Refrigerant cylinders should be shipped: | in the vertical, upright position |
| Which best describes the definition of Type I "Small Appliance" as defined by the EPA? | Systems manufactured, charged and hermetically sealed with five pounds or less or refrigerant |
| For service and repair and maintenance of small appliances, recovery equipment manufactured after ____ must be certified by an EPA approved organization | November 14, 1993 |
| For small appliance use, the recovery unit manufactured after November 15, 1993 must be capable of recovering: | 1) 80% of the refrigerant when the compressor is not operating 2) 90% of the refrigerant when the compressor is operating or achieve a 4" vacuum under ARI 740-1993 |
| The sale of Class I and Class II refrigerants is restricted to technicians certified by a EPA approved program after: | November 14, 1994 |
| The release of vapor from the top of a charging cylinder when filling should: | not be vented and should be recovered |
| Should the regulations of the Clean Air Act (CAA) change after a technician becomes certified: | it will be the technician's responsibility to comply with any changes in the law |
| Containers of HFC-134a are colored | light blue |
| System dependent refrigerant recovery of small appliances: | 1) does not require an operating compressor 2) requires 80% of the charge to be recovered 3) recovers refrigerant into a non-pressurized container |
| Mixed refrigerant sent to reclaim centers: | may be disposed of at owners expense |
| Before disposing of a small appliance containing CFC-12, it is necessary to: | recover the refrigerant |
| Hydrochloric and hydroflouric 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 compressors 3) to be avoided when handling with bare hands |
| 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 |
| Which of the following refrigerants can be mixed? | None of them (R-12 & R-134a,R-12 & R-11, R-22 & R-502 |
| CFC and HCFC refrigerants cause suffocation because: | they are heavier than air and displace oxygen |
| A nitrogen tank should always be equipped with a(n): | pressure regulator |
| Nitrogen used for brazing purposes, holding charges, or leak checking: | may be vented to the atmosphere |
| Line tapping and piercing valves should always be removed from a system after the repairs are completed because: | the neoprene gasket will eventually fail and cause a leak |
| CFCs will not be manufactured in the USA after: | 1995 |
| The law states that leaks in small appliances: | do not have to be repaired but it is good practice to repair whenever possible |
| To work on small appliances after November 14,1993, a technician must be certified as | 1) Type I 2) Universal |
| The required service aperture usually found on small appliance is: | the process stub |
| Package terminal heat pumps with less than five (5) pounds of refrigerant must be serviced by technicians with a _____ certification | Type I |
| Which refrigerants have a "0" ODP? | HFCs |
| Disposable refrigerant cylinders should be disposed of by: | using for a recovery cylinder |
| Which refrigerant is most commonly used today as a replacement for R-12 in newly manufactured small appliances? | R-134a |
| Which refrigerant can be used for leak detection as a trace gas and pressurized with nitrogen | R-22 |
| Traces of oil around the sight glass inlet fitting of a refrigeration system might be an indication of: | a leak |
| A condition of excessive superheat at the evaporator outlet and compressor inlet of an air conditioning system could be an indication of: | low refrigerant charge |
| Type II classification, as identified by the EPA, applies to what equipment? | split air conditioning systems with more than five(5) pounds of refrigerant charge |
| Front seating the suction service valve will close the | valve port to compressor |
| The required level of evacuation for recovery equipment manufactured before November 15, 1993 on a system with an R-22 | 0" Hg |
| The required level of evacuation for recovery equipment manufactured after November 15, 1993 on a system with an R-22 charge of less than 200 pounds is: | 0" Hg |
| The required level of evacuation for recovery equipment manufactured after November 15,1993 on a system with an R-12 charge of less than 200 pound is: | 10" Hg |
| Industrial process and commercial refrigeration equipment with an annual leak rate of _______% requires repair under EPA regulations | 35 |
| Comfort cooling chillers and all other equipment with an annual leak rate of ____% requires repair under EPA regulations. | 15 |
| 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 |
| The majority of the liquid be recovered from a system will be found in the | receiver (when applied) |
| It becomes the owners responsibility to maintain records of all refrigerant added to units that contain more than ___ pounds of refrigerant charge | 50 |
| A major repair is defined by the EPA as replacing the: | 1) compressor 2)evaporator |
| Exceptions to the required evacuation levels for recovery equipment that require an appliance be evacuated to only 0 PSIG apply | are filled with water or substances that would damaged the recovery equipment |
| The generally accepted rule for maximum liquid filling or a recovery cylinder is | 80% |
| The refrigerant you would expect to find in a split system air conditioner manufactured before 1995 would be: | R-22 |
| System dependent recovery equipment is limited to appliances containing less than ____ pounds of refrigerant | 15 |
| The state and condition of the refrigerant entering the receiver is: | subcooled high pressure liquid |
| The state and condition of the refrigerant leaving the accumulator is: | superheated low pressure vapor |
| Deep vacuums used for evacuation and dehydration of refrigeration systems are measured in: | microns |
| Non-condensables in an air conditioning or refrigeration system will: | 1) tend to stay near the top of the condenser 2) increase high side pressure 3) be purged with a recovery machine |
| R-134a is a drop-in replacement for: | it is not a drop-in replacement (R-12,R-11,R-22) |
| One of the easiest way of identify the type of refrigerant in a system is to: | check the name plate data |
| At a room temperature ambient of 80F, the pressure of a cylinder containing enough R-22 to have liquid in it will be approximately ____ PSIG: | 143 |
| Recovery machines using water as the condensing medium would generally use: | municipal water supply |
| Frost is best removed from a sight glass by: | spraying with alcohol |
| Recovery cylinders are color coded: | gray with yellow tops |
| Which refrigerant is a CFC and has been used with low pressure appliances? | R-11 |
| Type III certification as classified by the EPA is for: | low pressure appliances |
| The maximum pressure that should be applied to a low pressure chiller when leak checking with controlled nitrogen is ___ PSIG | 10 |
| The short term replacement for R-11 refrigerant in chillers is: | R-123 |
| Water tube leaks in a low pressure chiller are usually found with | a hydrostatic tube test kit |
| The required evacuations level for recovering refrigerant for a low pressure appliance with a recovery machine manufactured BEFORE November 15, 1993 is: | 25" Hg |
| The required evacuation level for recovering refrigerant from a low pressure appliance with a recovery machine manufactured AFTER November 15, 1993 is: | 25" Hg |
| A low pressure chiller generally has the rupture disk set at ___ PSIG | 15 |
| To prevent freezing of the water coils of a low pressure chiller, it is recommend that: | 1) when charging, begin with vapor 2) circulate water through the chiller when charging 3) do not charge liquid until saturation temperature is above 32F |
| A low pressure chiller that provides comfort cooling that an annual leak rate of ___% of the total charge, must be repaired | 15 |
| R-134a is classified as a ___ under ASHRAE 34 Standard Safety Group: | A1 |
| R-123 is classified as a ___ under ASHRAE 34 Standard Safety Group: | B1 |
| Under ASHRAE Standard 15, what refrigerant requires equipment room sensors? | R-123 |
| Under ASHRAE Standard 15, what refrigerant requires equipment room oxygen deprivation sensors? | 1) R-12 2) R-500 3) R-134a |
| Low pressure chillers require purge units because: | 1) they operate below atmospheric pressure 2) they draw non-condensables through gaskets and seals |
| The rupture disk of a low pressure chiller is connected to the | low side |
| The purge unit usually draws from the | top of the condenser |
| Before a low pressure appliance is dismantled and salvaged | the refrigerant must be recovered |
| Machined room safety standards have been established by | ASHRAE-15 |
| Refrigerant vapor is charged into a low pressure chiller initially to prevent | water freeze up caused by system vacuum |
| If excessive nitrogen pressure is exerted with a low pressure chiller, what component would fail fist | rupture disk |
| R-11 & R-123 refrigerants are | 1) oxygen depleting 2) heavier than air 3) are Class I and II substances as defined by the EPA |
Created by:
toolegit