Chlorofluorocarbon (CFC) Refrigeration Practice Exam (100 Questions)
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The topic is Chlorofluorocarbon (CFC) Refrigeration. The following exam is produced to test knowledge of safe refrigerant handling and EPA regulations regarding the HVAC industry. It contains over hundred questions of the topic to make sure your knowledge level gets tested so you can prepare yourself for the final exam.
- 1.__ is a blend of two or more components whose equilibrium vapor phase and liquid phase compositions are the same at a given pressure.
- A.
Azeotrope
- B.
Compound
- C.
Fractionation
- D.
Halocarbon
- 2.__ is a halogenated hydrocarbon containing one or more of the three halogens: fluorine, chlorine, and bromine.
- A.
Azeotrope
- B.
Compound
- C.
Fractionation
- D.
Halocarbon
- 3.Chlorofluorocarbons (CFCs) consist of ___, ___, and __ .
- A.
Chlorine, fluorine, carbon
- B.
.chlorine, fluorine, cesium
- C.
Carbon, fluorine, other chemicals
- D.
Cesium, fluoride, carbon
- E.
Chlorine, fluoride, carbon
- 4.
- A.
Hydrogen
- B.
Bromine
- C.
Chlorine
- D.
.air
- 5.
- A.
Atmospheric
- B.
Stratospheric
- C.
Marine
- D.
Climatic
- 6.Of the three common types of refrigerants __ has the highest high ozone-depletion potential (ODP).
- A.
CFCs
- B.
HCFCs
- C.
HFCs
- D.
LJCs
- 7._ test methods are assumed by the EPA as the most effective methods for locating the general area of small leaks.
- A.
Electronic and Ultrasonic
- B.
Halide torch
- C.
Soap bubble
- D.
Both I and 2
- 8.After evacuation of a system, if the pressure rises ABOVE ambient pressure, then ____.
- A.
Trapped refrigerant is probably boiling-off .
- B.
It could be a leak
- C.
.both 1and 2
- D.
None of the above
- 9.
- A.
Can be legally vented to the atmosphere since it can't be reclaimed
- B.
Must be destroyed by incineration at a approved facility
- C.
Must be used only in Small Appliances
- D.
Must be transferred into a disposable cylinder and discarded at a municipal landfill
- 10.
- A.
Close to the vacuum pump
- B.
As close as possible to the system being evacuated
- C.
In series to avoid EPA problems
- D.
In parallel to avoid EPA problems
- 11.Manufacture of CFCs will be banned after December 31, __ .
- A.
1994
- B.
1995
- C.
2000
- D.
2010
- 12.
- A.
Hydrogen
- B.
Water
- C.
Bromine
- D.
Helium
- E.
Heptane
- 13.Under EPA's regulations, reclaimed refrigerant must meet __ standards for purity before it can be resold. .
- A.
ARI-700
- B.
ARI-740
- C.
SAE 1792
- D.
EPA 1992
- 14.
- A.
System-dependent
- B.
Self-contained
- C.
System-independent
- D.
Approved
- E.
Illegal
- F.
Automatic
- 15.All devices used for refrigerant recovery must meet __ standards.
- A.
EPA
- B.
DOT
- C.
DOE
- D.
EPRI
- 16.List one HCFC:
- A.
R134a
- B.
R12
- C.
R22
- D.
R113
- 17.Refrigerants which contain no chlorine at all are called __ .
- A.
CFCs
- B.
HCFCs
- C.
HFCs
- D.
ODCs
- 18.CHF2CF3 refrigerant is a __ .
- A.
HFC
- B.
HCFC
- C.
HFCF
- D.
HBFC
- 19.Ozone in the stratosphere consists of' molecules containing __ oxygen atom(s).
- A.
1
- B.
2
- C.
3
- D.
4
- 20.__ in refrigerants causes ozone destruction.
- A.
Chlorine
- B.
Fluorine
- C.
Both chlorine and fluorine
- D.
Both fluoride and carbon
- 21.CFCs are able to reach the stratosphere because __ .
- A.
They are chemically very stable
- B.
They are chemically very unstable
- C.
They are lighter than air
- D.
They are very toxic
- 22.The lower case letter following the refrigerant number, as in 134a for example, is the:
- A.
Number of A atoms
- B.
Number of A molecules
- C.
.form of the isomer
- D.
Stands for advanced molecule.
- 23.________ refrigerants are toxic.
- A.
Group 1
- B.
Group 2
- C.
Group 3
- D.
Group 4
- 24.__ refrigerants are nonflammable mixtures of group 1 and 3 refrigerants, which are nonflammable as formulated but whose composition can become flammable due to fractionation under some leakage situations.
- A.
Group 1
- B.
Group 2
- C.
Group 3
- D.
Group 4
- 25.__ refrigerants are flammable but not toxic.
- A.
Group 1
- B.
Group 2
- C.
Group 3
- D.
Group 4
- 26.__ refrigerants do not show flame propagation.
- A.
Group 1
- B.
Group 2
- C.
Group 3
- D.
Group 4
- 27.R-134a tanks are __________.
- A.
Light blue
- B.
Green
- C.
Orange
- D.
Yellow
- 28.Disposable cylinders are manufactured to specifications established by the_.
- A.
EPA
- B.
DOT
- C.
IRA
- D.
DOD
- E.
NASA
- 29.Every refrigerant cylinder is equipped with a device that will automatically vent pressure from the cylinder before it reaches the rupture point. What is this devise called?
- A.
Safety (pressure) relief valve
- B.
Hand valve
- C.
Needle valve
- D.
Shraeder Valve
- 30.Refillable cylinders are regulated in their design, fabrication and testing by the _________ for use in the transportation of refrigerants-
- A.
EPA
- B.
DOT
- C.
DOD
- D.
EPRI
- 31.Capturing and ultimately eliminating the use of chlorofluorocarbons is being done in the United States to stop damage to the __ ozone layer.
- A.
Stratospheric
- B.
Ground
- C.
Ultra violet
- D.
Infrared
- 32.State and local governments may establish laws that contain __ regulations than Clean Air Act/EPA regulations.
- A.
Stricter
- B.
Less restrictive
- C.
Either 1 or 2
- D.
Neither 1 or 2
- 33.The Clean Air Act __ .
- A.
Calls for the phase-out of CFC/HCFC production
- B.
Prohibits CFC/HCFC venting as of July 1, 1992
- C.
Requires the EPA to set standards for equipment and technicians
- D.
All the above
- 34.Before you dispose of any appliance containing refrigerant, you must recover the refrigerant.
- A.
CFC
- B.
HFC
- C.
HCFC
- D.
All three
- E.
Both 1 and 2
- F.
Both 1 and 3
- 35.CFCs can no longer be manufactured or imported into the United States after _____
- A.
July 1, 1992
- B.
November 14, 1994
- C.
January 1, 1995
- D.
December 31, 1995
- 36.Recovery cylinders are painted __ in the shoulder area and twelve inches down the side.
- A.
Red
- B.
Green
- C.
Yellow
- D.
Blue
- 37.Refrigerant cylinders must bere-tested at ______ intervals.
- A.
Five-year
- B.
Monthly
- C.
Ten-year
- D.
Thirty-year
- 38.Chemically, oxygen is 02, and ozone is _____.
- A.
O1
- B.
O2
- C.
O3
- D.
O4
- E.
O5
- 39.After __ individuals servicing and disposing of air conditioning and refrigeration equipment are prohibited from knowingly venting refrigerant into the atmosphere.
- A.
Novernber 1, 1995
- B.
July 1, 1992
- C.
January 1, 1993
- D.
January 1, 2000
- E.
January 1, 2015
- F.
July 1, 1993
- 40.Under the EPA equipment certification requirement, mandatory equipment certification would go into effect on __ .
- A.
November 15, 1993
- B.
January 1, 1993
- C.
July 1, 1992
- D.
November 14, 1994
- E.
January 1,2015
- F.
July 1, 1993
- 41.Under the EPA Final Rule, technician certification requirements would go into effect on
- A.
November 1, 1995
- B.
July 1, 1992
- C.
November 14, 1994
- D.
January 1, 2000
- E.
January 1, 2015
- F.
July 1, 1993
- 42.______ means to clean refrigerant for reuse by oil separation and single or multiple passes through devices, such as replaceable core filter-driers, which reduce moisture, acidity and particulate matter.
- A.
Recovery
- B.
Recycling
- C.
Reclamation
- D.
Recirculate
- 43.__ requires chemical analysis of the refrigerant to verify that the ARI 700 Purity Specifications are met.
- A.
Recovery
- B.
Recycling
- C.
Reclamation
- D.
Recirculate
- 44.__ means, to remove refrigerant in any condition from a system and store it in an external container without necessarily testing or processing it in any way.
- A.
Recovery
- B.
Recycling
- C.
Reclamation
- D.
Recirculate
- 45.Used disposable refrigerant cylinders can be _____. '
- A.
Recycled with other scrap metal after they are emptied and rendered useless
- B.
Filled with compressed air to fix flats
- C.
Re-certified as Recovery Tanks after painting
- D.
Refilled twice before discarding
- 46.The internal pressure of a cylinder with one pound of liquid refrigerant is __ the internal pressure of a full 50-pound cylinder.
- A.
1/50
- B.
Half
- C.
A quarter
- D.
The same as
- 47.
- A.
DOT
- B.
DOE
- C.
ARI
- D.
SAE
- 48.Approved refillable tanks should never be filled to more than __ of their total capacity.
- A.
97%
- B.
95%
- C.
80%
- D.
70%
- 49.The ozone layer absorbs and scatters __ light from the sun, which prevents harmful amounts from reaching the earth.
- A.
Ultraviolet
- B.
Infrared
- C.
Visible
- D.
Moon
- 50.Ozone at ground level is __ .
- A.
A harmful pollutant
- B.
A protective shield
- C.
The same as oxygen
- D.
Never found
- 51.When ozone depletion occurs, ______UV radiation penetrates to the Earth's surface.
- A.
More
- B.
Less
- C.
Alpha
- D.
Zama
- 52.______ containing compounds, which are contained in typical Halon fire extinguishers, also destroy the ozone.
- A.
Bromine
- B.
Carbon
- C.
Water
- D.
Hydrogen
- 53.The Environmental Protection Agency is authorized to pay awards of up to _____ to any person who furnishes information which leads to a criminal conviction of another person for violation of the Clean Air Act
- A.
$1,000
- B.
$2,000
- C.
$10,000
- D.
$25,000
- 54.) The excise tax rate on refrigeration applies to _________refrigerants.
- A.
New
- B.
Reclaimed
- C.
Recycled
- D.
All
- 55.Mixtures of __ that are used as holding charges or as leak test gases are not subject to the July 1, 1992 prohibition.
- A.
Nitrogen and R-22
- B.
Nitrogen and R-12
- C.
Nitrogen and R-l1
- D.
Both 1 and 2
- 56.Under EPA regulations, equipment manufactured on or after __ has to be certified to meet certain standards.
- A.
January 1, 1993
- B.
November 15, 1993
- C.
November 14, 1994
- D.
July 1, 1992
- 57.Under the Clean Air Act, the EPA is authorized to assess fines of up to __ per day per violation for any violation of the Clean Air Act.
- A.
$1,000
- B.
$5,000
- C.
$10,000
- D.
$27,500
- 58.Hydrochlorofluorocarbon (HCFC) refrigerants contain __ .
- A.
Hydrogen, chlorine, fluorine, and carbon
- B.
Hydrogen, chlorine, fluorine, and calcium
- C.
Helium, chlorine, fluorine, and carbon
- D.
Hydrogen, chlorine, fluorine, and calcium
- 59.Hydrofluorocarbon (HFC) refrigerants contain __ .
- A.
Hydrogen, fluorine, and carbon
- B.
Hydrogen, fluorine and calcium.
- C.
Helium. fluorine, and carbon
- D.
Hydrogen, chlorine, fluorine, and carbon
- 60.HFC fluorocarbon refrigerants cause no harm to the stratospheric ozone, they have
- A.
Zero ODP
- B.
Low ODP
- C.
High ODP
- D.
Zero GHE
- 61.__ are a result of damage to the Earth's ozone layer.
- A.
Skin cancers
- B.
Cataracts
- C.
Reduced crop yields
- D.
All three
- 62.The existence of __ in the upper stratosphere indicates that the ozone layer is being destroyed.
- A.
Chlorine monoxide
- B.
Water
- C.
Ozone
- D.
Both 1 and 3
- 63.Since __ it has been illegal to knowingly release CFC and HCFC refrigerants during the service, maintenance, repair or disposal of appliances.
- A.
July I, 1992
- B.
November 14, 1994
- C.
December 31, 1995
- D.
January 1, 1995
- 64.Since it has been illegal to knowingly release HFC refrigerants during the service, maintenance, repair or disposal of appliances.
- A.
July 1, 1992
- B.
November 15, 1995
- C.
November 14,1993
- D.
December 31, 1995
- 65.__ are controlled by the Montreal Protocol
- A.
Chlorofluorocarbons, Hydrochlorofluorocarbons, and Halons
- B.
Chlorofluorocarbons, Hydrochlorofluorocarbons, Halons, and Hydrofluorocarbons
- C.
Chlorofluorocarbons, Halons, and Hydrofluorocarbons
- D.
Chlorofluorocarbons and Halons
- 66.The equipment covered by EPA regulations includes all air conditioning and refrigeration equipment containing and using ______refrigerants.
- A.
CFC
- B.
HCFC
- C.
Any toxic
- D.
HFC
- E.
All
- F.
Both 1 and 2
- G.
Both 1 and 3
- 67.__ recovery devices can capture liquid and/or vapor refrigerant without the assistance of components in the air conditioning or refrigeration equipment
- A.
System-dependent
- B.
Self -contained
- C.
System-independent
- D.
Approved
- E.
Illegal
- F.
Automatic
- 68.Hygroscopic means affinity for __ .
- A.
Ozone
- B.
Refrigerant
- C.
Water
- D.
Air and other non-condensebles
- 69.The oils that will be employed with most of the HFC-134a refrigeration applications are:
- A.
Organic mixtures
- B.
Synthetic-esters
- C.
Alkylbenzene
- D.
All of these
- 70.The synthetic lubricant presently used with ternary blends is __ .
- A.
Organic mixtures
- B.
Synthetic-esters
- C.
Alkylbenzene
- D.
All of these
- 71.A __ refrigerant has a range of boiling points or condensing points throughout the evaporator and condenser, respectively. The term used to describe this is temperature glide" or "gliding-temperature."
- A.
Non-azeotropic
- B.
Azeotropic
- C.
Pure
- D.
Reclaimed
- 72.A __ blend is a two-part mixture.
- A.
Binary
- B.
Ternary
- C.
Unitary
- D.
Both 1 and 2
- 73.The __ changes a high-pressure vapor to a high-pressure liquid.
- A.
Evaporator
- B.
Condenser
- C.
Compressor
- D.
Expansion device or TXV
- 74.The component which changes a low-pressure vapor to a high-pressure vapor is the
- A.
Evaporator
- B.
Condenser
- C.
Compressor
- D.
Expansion device or TXV
- 75.__ is the cleaning of refrigerant for reuse by oil separation and single or multiple passes through moisture absorption devices.
- A.
Recirculation
- B.
Recycling
- C.
Recovery
- D.
Reclamation
- 76.__ is defined as processing refrigerant to a level equal to new product specifications as determined by chemical analysis.
- A.
Recirculation
- B.
Recycling
- C.
Recovery
- D.
Reclamation
- 77._______ is the transfer of refrigerant, in any condition, from a system to a storage container, without testing or purifying the refrigerant in any way.
- A.
Recirculation
- B.
Recycling
- C.
Recovery
- D.
Reclamation
- 78.During dehydration of a refrigeration system, the refrigeration system can be___________ to decrease dehydration time
- A.
Heated
- B.
Cooled
- C.
Either 1 or 2
- D.
Neither 1 or 2 will affect dehydration time
- 79.When recharging an R-11 system, the first step is to charge the unit with refrigerant vapor __ .
- A.
To avoid liquid evaporation
- B.
To reduce non-condensable formation
- C.
To avoid evaporator water freezing problems
- D.
Both 1 and 3
- E.
All of the above
- 80.
- A.
Very high-pressure appliance
- B.
High-pressure appliance
- C.
Low-pressure appliance
- D.
Very low-pressure appliance
- 81.System vacuum level is measured with the __
- A.
1) system isolated
- B.
2) vacuum pump running
- C.
3) system compressor running
- D.
4) recovery system running
- 82.When leak testing a low pressure centrifugal with nitrogen, the maximum test pressure is______ psig.
- A.
10
- B.
100
- C.
350
- D.
400
- 83.The EPA defines __ as any service, maintenance, or repair on an appliance that could reasonably be expected to release refrigerant from the appliance to the atmosphere unless the refrigerant was previously recovered from the appliance.
- A.
Opening an appliance
- B.
Minor service
- C.
Service
- D.
None of these
- 84.The EPA defines __ as the length of tubing that provides access to the refrigerant inside a small appliance or room air conditioner and that can be resealed at the conclusion of repair or service.
- A.
Process stub
- B.
Charging stub
- C.
Recovery stub
- 85.
- A.
There is no pressure relief valve on the typical hose and the liquid refrigerant trapped in the hose could build up significant pressure and rupture the hose
- B.
Low-loss fittings are required since January 1992
- C.
There is no reason not to trap liquid refrigerant in the hose since it will avoid venting of refrigerant
- D.
All of the above
- 86.A device that removes air and other non-condensables from the top of the condenser of a centrifugal refrigeration system during operation is called a ____.
- A.
System dependent recirculation unit
- B.
Purge unit
- C.
System dependent recovery unit
- D.
System independent recovery unit
- 87.The EPA defines __ as any of the following products that are fully manufactured, charged, and hermetically sealed in a factory with five pounds or less of refrigerant: refrigerators and freezers designed for home use, room air conditioners (including window air conditioners and packaged terminal air conditioners), packaged terminal heat pumps, dehumidifiers, under-the-counter ice makers, vending machines, and drinking water coolers.
- A.
Home appliance
- B.
Residential appliance
- C.
Small appliance
- D.
Hermetic appliance
- 88.Whenever a technician is working with any _______, the technician should always review the material safety data sheets, which by law should be shipped by the manufacturer with these compounds.
- A.
Unknown solvents
- B.
Unknown refrigerants
- C.
Unknown chemical
- D.
All of these
- 89.When recovering refrigerant from an R-11 system, the service technician should keep the evaporator chiller water flowing to avoid __ .
- A.
Freezing of the water
- B.
Corrosion
- C.
Destruction of the ozone
- D.
Release of toxic fumes
- 90.Refrigerant vapors or mist in high concentrations should not be inhaled since they have been demonstrated to cause_______.
- A.
Heart irregularities
- B.
Unconsciousness
- C.
Oxygen deprivation
- D.
All of these
- 91.Pressure relief valves must never be __ .
- A.
Installed in series
- B.
Used if rusted or corroded
- C.
Tampered with
- D.
All of these
- 92.When pressurizing a refrigeration system with nitrogen, _____.
- A.
A nitrogen regulator is not required since the pressure is low
- B.
Charge with liquid nitrogen whenever possible since it is faster
- C.
Only charge with nitrogen vapor and use a regulator
- D.
Both 1 and 2 above
- 93.Under EPA's regulations it is allowable to use __ to pressurize a R-11 system for the purpose of opening the system for a non-major repair.
- A.
An open flame gently applied to the condenser
- B.
Hot water
- C.
A propane gas or acetylene-air torch but not an oxygen-acetylene torch (since this would be too hot)
- D.
Both 2 and 3
- 94.The EPA defines __ as maintenance, service, or repair that involves removal of the appliance's compressor, condenser, evaporator, or auxiliary heat exchanger oi1.
- A.
Major maintenance
- B.
Minor maintenance
- C.
System maintenance
- D.
Service maintenance
- 95.The EPA defines a ____ as any appliance that is a motor vehicle air conditioner as defined in 40 CFR part 82, subpart B.
- A.
Motor vehicle air conditioner (MVAC)
- B.
Motor vehicle like air conditioner (MVAC-like)
- C.
Automotive cooling system
- D.
Automotive air conditioning system
- 96.The EPA defines __ as the reprocessing of refrigerant to at least the purity specified in ARI Standard 700, Specifications for Fluorocarbon Refrigerants, and to verify this purity using the analytical methodology prescribed in the Standard.
- A.
Recirculating
- B.
Recycling
- C.
Reclamation
- D.
Recovering
- 97.When using recovery and recycling equipment manufactured AFTER November 15, 1993, technicians must evacuate an appliance containing LESS than 200 pounds of R-22 to __ of mercury vacuum before making a major repair.
- A.
0.0"
- B.
10"
- C.
15"
- D.
28.9"
- 98._______ can be used with R-22 to leak check hardware.
- A.
Oxygen
- B.
Compressed air
- C.
Nitrogen
- D.
Any of these
- 99.Approved refrigerant recovery cylinders can be identified by ________.
- A.
Yellow tops and gray bodies
- B.
Gray tops and yellow bodies
- C.
Brown tops and green bodies
- D.
White tops and green bodies
- 100.A major reason why a refrigerant tank should never be heated with an open flame is because it might __________ .
- A.
Explode
- B.
Rust
- C.
Add to global warming
- D.
All of the above
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