PRACTICE TEST
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| which refrigerants contain the chlorine? | show 🗑
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| As of what date did it become unlawful to intentionally release Class I and Class II refrigerants into the atmosphere | show 🗑
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| Which refrigerants have the lowest ozone depletion potential? (ODP)? | show 🗑
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| The moelcule found in CFC and HCFC refrigerants that destroys ozone in the atmosphere is: | show 🗑
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| Stratospheric ozone consists of | show 🗑
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| Stratospheric ozone depletion is a_____problem. | show 🗑
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| show | ozone
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| Which refrigerant is a CFC? | show 🗑
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| show | R-22
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| show | R-134a
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| show | R-134a
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| The molecule found in the stratosphere that indicates that ozone depletion is taking place is: | show 🗑
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| Which of the following would violate the Clean Air Act (CAA) | show 🗑
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| show | virgin refrigerant
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| The maximum safe fill level of a refrigerant cylinder is _______ % liquid | show 🗑
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| The time it takes to properly evacuate and dehydrated refrigeration system is determined by: | show 🗑
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| show | 1) may contain moisture 2) may have a leak
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| To RECOVER refrigerant is to: | show 🗑
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| show | recycle
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| The synthetic lubricant used with HCFC based ternary blends is | show 🗑
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| show | HFC-134a is not a drop-in refrigerant
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| show | superheated vapor
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| show | subcooled liquid
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| show | compressor
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| Refrigerant cylinders should be shipped: | show 🗑
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| show | Systems manufactured, charged and hermetically sealed with five pounds or less or refrigerant
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| For service and repair and maintenance of small appliances, recovery equipment manufactured after ____ must be certified by an EPA approved organization | show 🗑
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| show | 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
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| The sale of Class I and Class II refrigerants is restricted to technicians certified by a EPA approved program after: | show 🗑
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| show | not be vented and should be recovered
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| show | it will be the technician's responsibility to comply with any changes in the law
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| Containers of HFC-134a are colored | show 🗑
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| System dependent refrigerant recovery of small appliances: | show 🗑
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| show | may be disposed of at owners expense
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| show | recover the refrigerant
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| show | 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
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| A system has been operating with a complete restriction at the capillary tube inlet, what access is required for recovery? | show 🗑
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| Which of the following refrigerants can be mixed? | show 🗑
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| show | they are heavier than air and displace oxygen
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| show | pressure regulator
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| show | may be vented to the atmosphere
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| Line tapping and piercing valves should always be removed from a system after the repairs are completed because: | show 🗑
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| CFCs will not be manufactured in the USA after: | show 🗑
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| show | do not have to be repaired but it is good practice to repair whenever possible
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| show | 1) Type I 2) Universal
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| show | the process stub
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| show | Type I
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| Which refrigerants have a "0" ODP? | show 🗑
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| show | using for a recovery cylinder
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| Which refrigerant is most commonly used today as a replacement for R-12 in newly manufactured small appliances? | show 🗑
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| show | R-22
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| Traces of oil around the sight glass inlet fitting of a refrigeration system might be an indication of: | show 🗑
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| show | low refrigerant charge
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| Type II classification, as identified by the EPA, applies to what equipment? | show 🗑
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| Front seating the suction service valve will close the | show 🗑
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| show | 0" Hg
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| show | 0" Hg
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| 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: | show 🗑
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| Industrial process and commercial refrigeration equipment with an annual leak rate of _______% requires repair under EPA regulations | show 🗑
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| show | 15
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| show | 1) recovering as much liquid as possible in the initial stages 2) using short hoses 3) cooling the recovery tank in ice water
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| The majority of the liquid be recovered from a system will be found in the | show 🗑
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| show | 50
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| A major repair is defined by the EPA as replacing the: | show 🗑
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| show | are filled with water or substances that would damaged the recovery equipment
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| show | 80%
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| show | R-22
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| show | 15
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| show | subcooled high pressure liquid
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| The state and condition of the refrigerant leaving the accumulator is: | show 🗑
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| Deep vacuums used for evacuation and dehydration of refrigeration systems are measured in: | show 🗑
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| show | 1) tend to stay near the top of the condenser 2) increase high side pressure 3) be purged with a recovery machine
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| R-134a is a drop-in replacement for: | show 🗑
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| show | check the name plate data
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| 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: | show 🗑
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| Recovery machines using water as the condensing medium would generally use: | show 🗑
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| Frost is best removed from a sight glass by: | show 🗑
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| Recovery cylinders are color coded: | show 🗑
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| Which refrigerant is a CFC and has been used with low pressure appliances? | show 🗑
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| Type III certification as classified by the EPA is for: | show 🗑
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| The maximum pressure that should be applied to a low pressure chiller when leak checking with controlled nitrogen is ___ PSIG | show 🗑
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| show | R-123
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| Water tube leaks in a low pressure chiller are usually found with | show 🗑
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| show | 25" Hg
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| The required evacuation level for recovering refrigerant from a low pressure appliance with a recovery machine manufactured AFTER November 15, 1993 is: | show 🗑
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| show | 15
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| show | 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
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| show | 15
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| show | A1
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| R-123 is classified as a ___ under ASHRAE 34 Standard Safety Group: | show 🗑
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| show | R-123
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| Under ASHRAE Standard 15, what refrigerant requires equipment room oxygen deprivation sensors? | show 🗑
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| Low pressure chillers require purge units because: | show 🗑
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| The rupture disk of a low pressure chiller is connected to the | show 🗑
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| The purge unit usually draws from the | show 🗑
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| Before a low pressure appliance is dismantled and salvaged | show 🗑
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| show | ASHRAE-15
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| Refrigerant vapor is charged into a low pressure chiller initially to prevent | show 🗑
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| If excessive nitrogen pressure is exerted with a low pressure chiller, what component would fail fist | show 🗑
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| R-11 & R-123 refrigerants are | show 🗑
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Created by:
toolegit