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EPA Section 608 Certification Exam: Practice Questions and Answers, Exams of Engineering Chemistry

Virginia State University (VSU)Engineering Chemistry

A comprehensive set of practice questions and answers for the epa section 608 certification exam, which is required for refrigeration technicians. The questions cover a wide range of topics related to refrigerant handling, regulations, and environmental impact. This study guide is designed to help technicians prepare for the exam and ensure they understand the proper procedures for working with refrigerants, promoting environmental responsibility and regulatory compliance. It includes key concepts such as ozone depletion, refrigerant recovery, and safe handling practices, making it a valuable resource for exam preparation and professional development.

Typology: Exams

2025/2026

Available from 10/24/2025

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EPA Section 608 Study Question Pool
1. 1. Refrigeration technicians who violate the Clean Air Act can : A ) lose their EPA
certification . B ) be fined . C ) be required to appear in Federal court . D ) all of the
above: D
2.
2. After 1995 , any supplies of CFC refrigerant to service existing units in the USA
can only come from : A ) recovery and recycling . B ) solvent conversion . C
) European chemical manufacturers . D ) Third World chemical manufacturers
.:
A
3.
3. Refrigerant that is recovered can be returned to : A ) the same system or other
systems owned by the same person without restriction . B ) used in any system
serviced that day C ) Sold as used refrigerant to other customers . D ) Called
Reclaimed if a filter - drier was used during recovery .:
A
4.
4 Refrigerant can not be called " reclaimed " unless it A ) was processed in a
reclaiming machine . B ) has been chemically analyzed and the refrigerant
meets the ARI - 700 purity standard . C ) is recovered from a system less than 1
year old
.. D ) is recovered from a system still under warrantee .: B
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Download EPA Section 608 Certification Exam: Practice Questions and Answers and more Exams Engineering Chemistry in PDF only on Docsity!

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EPA Section 608 Study Question Pool

    1. Refrigeration technicians who violate the Clean Air Act can : A ) lose their EPA certification. B ) be fined. C ) be required to appear in Federal court. D ) all of the above: D
    1. After 1995 , any supplies of CFC refrigerant to service existing units in the USA can only come from : A ) recovery and recycling. B ) solvent conversion. C ) European chemical manufacturers. D ) Third World chemical manufacturers .: A
    1. Refrigerant that is recovered can be returned to : A ) the same system or other systems owned by the same person without restriction. B ) used in any system serviced that day C ) Sold as used refrigerant to other customers. D ) Called Reclaimed if a filter - drier was used during recovery .: A
  4. 4 Refrigerant can not be called " reclaimed " unless it A ) was processed in a reclaiming machine. B ) has been chemically analyzed and the refrigerant meets the ARI - 700 purity standard. C ) is recovered from a system less than 1 year old .. D ) is recovered from a system still under warrantee .: B

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    1. The EPA can require a technician to demonstrate their ability to perform proper procedures for recovering and / or recycling refrigerant. Failure to demonstrate competency can result in : A ) revocation of the technician's certification. B ) seizure of the technician's recovery or recycling equipment. C ) seizure of any refrigerant purchased by the technician which is still in his / her possession. D ) mandatory attendance at a refrigerant training camp .: A
    1. What characteristic ( s ) of CFCs make them more likely to reach the stratosphere than most other compounds containing chlorine? A ) Refrigerants that contain chlorine but not hydrogen are so stable that they do not break down in the lower atmosphere after being released. The chlorine or bromine reacts with ozone , causing it to change back to oxygen , thus destroying the ozone layer. B ) CFCs are lighter than other damaging compounds , making it easier for them to float upward when released. C ) CFCs are attracted to the static in the atmosphere. D ) CFCs are attracted to dust in the atmosphere .: A
    1. A system is considered dehydrated when A ) the vacuum indicator shows you have reached and held the required finished vacuum. B ) the vacuum pump has run at least 7 hours. C ) the manifold suction gauge has held a 30 in. hg./ mm vacuum for 3 hours. D ) you are ready to leave for the day .: A

4 / 31 very high temperatures. C ) as a liquid. D ) the same as any other refrigerant .: C

    1. Blended refrigerants leak from a system : A ) faster than other refriger- ants. B ) in uneven amounts due to different vapor pressures. C ) slower than other refrigerants. D ) only if the joint fails completely .: B
    1. Which of the following gases help form the earth's protective shield? A ) Chorine B ) Chlorides C ) Carbon Monoxide D ) Stratospheric Ozone: D
    1. In a refrigeration system , the device that changes a low pressure vapor to a high pressure vapor is the : A ) evaporator. B ) expansion device. C ) compressor. D ) condenser .: C
    1. Data shows that chlorine in the stratosphere comes mainly from CFCs rather than from natural sources such as volcanoes because : A ) The rise in the amount of chlorine in the stratosphere matches the rise in the amount of fluorine , which has different natural sources than chlorine. B ) The rise in the amount of chlorine in the stratosphere matches the rise in CFC emissions . C ) Air samples taken from the stratosphere over erupting volcanoes show that volcanoes contribute a small quantity of chlorine to the stratosphere when compared to CFCs. D) All of the above: D

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    1. Which atom of the CFC molecule causes ozone depletion? A ) fluorine B ) chlorine C ) sodium D ) helium: B
    1. The ozone layer protects the earth from : A ) nuclear radiation. B ) infrared radiation C ) ultraviolet radiation from the sun. D ) bacteria from space .: C
    1. When using with any solvent , cleaner , chemical or refrigerant , you should review A ) moisture solubility information. B ) chemical compound reference sheets. C ) material safety data sheets. D ) chemical composition reference sheets .: C
    1. 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 ) $ 27,000 D ) $ 37,000: B
    1. The Montreal Protocol is : A ) an energy efficiency test developed by the Canadian government. B ) a test procedure for measuring the level of chlorine in the stratosphere. C ) a procedure or protocol to test for ozone concentration in the atmosphere D ) a treaty among nations that controls production of CFC's and HCFC's .: D
    1. Which refrigerant is an HCFC? A ) R - 123 B ) R - 134a C ) R - 410A D ) R - 12: A

7 / 31 downstream line from the pressure regulator. D ) No refrigerant lines can leak .: C

    1. During servicing of a refrigeration system containing R - 12 , the refrig- erant must be : A ) recovered. B ) recovered and replaced with R - 134a , no exceptions! C ) vented. D ) destroyed .: A
    1. Which safety precaution ( s ) should always be followed : A ) Never apply an open flame to a refrigerant cylinder. B ) Never cut or weld any refrigerant line when refrigerant is in the line. C ) Never use oxygen to purge lines or to pressurize a system. D ) all of the above: D
    1. In a vapor compression refrigeration system , cooling occurs when : ( A ) refrigerant liquid turns to a vapor. B ) refrigerant vapor turns to a liquid. C ) the refrigerant is under maximum pressure. D ) the refrigerant gives off heat .: A
    1. The evacuation of a system is a method of A ) pinpointing the location of leaks B ) acid removal. C ) dehydration. D ) all of the above: C

Each chlorine atom in the stratosphere can destroy ozone molecules A ) 100 B ) 1,000 C ) 10,000 D ) 100,000: D

    1. An example of a HFC refrigerant is : A ) R - 11 B ) R - 124 C ) R - 142b D ) R

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- 410A: D

    1. Which gas ( es ) would cause the LEAST damage to the environment during a leak check? A ) dry nitrogen and R - 22 B ) dry nitrogen and R - 12 C ) compressed air and R - 12 D ) dry nitrogen: D
    1. Refrigerant migrates to the compressor crankcase because of a differ- ence in between the refrigerant and the oil. A ) vapor pressure B ) acidity C ) volume D ) density: A
    1. Which refrigerant is an HCFC? A ) R - 22 B ) R - 134a C ) R - 410A D ) R
  • 12: A
    1. It is important not to mix R - 22 and R - 410A refrigerants in the same container because A ) the mixture may be impossible to reclaim B ) the mixture will explode. C ) the mixture is corrosive. D ) they use different oils ,: A
    1. When using recovery unit , the fill level of the recovery tank can be controlled by A ) a mechanical float switch. B ) an electronic shut - off device. C ) weight. D ) all of the above .: D
    1. Which of the following refrigerant releases is a violation of the EPA prohibition on venting? A ) release of " de minimis " quantities in the course of making good faith attempts to recover refrigerant B ) release of mixtures of

10 / 31 evaporator collapse. B ) damages vacuum gauge sets. C ) causes vacuum pump damage. D ) does not occur .: D

    1. Equipment covered by EPA regulations include : A ) only refrigerators and freezers using CFC's B ) only air - conditioning and refrigeration equipment con- taining and using HCFC refrigerants. C ) all air - conditioning and refrigeration equipment using CFC , HCFC or HFC refrigerants. D ) only commercial air - conditioning and refrigeration equipment made in the USA .: C
    1. Never overfill refrigerant storage cylinders because A ) the cylinder may be too heavy to carry B ) the internal pressure of the cylinders may rise in heated areas and cause an explosion. C ) some refrigerant may be vented as the cylinder valve is closed. D ) the extra space in the cylinder might be needed for the next job .: B
    1. It is important not to mix different refrigerants in the same container be- cause A ) the mixture may be impossible to reclaim. B ) the mixture will explode . C ) the refrigerant mixture might be toxic. D ) it violates EPA environmental regulations .: A
    1. Manifold gauge sets are often color coded , when this is done , the low pressure gauge is color coded : A ) red. B ) white. C ) blue D ) yellow .: C
    1. All devices used for refrigerant recovery must : A ) be portable and weigh

11 / 31 less than 100 pounds. B ) contain a heavy - duty ozone shield. C ) have a 5 Ton

  • refrigeration rating at 100F D ) meet EPA standards: D
    1. Reusable refrigerant containers that are normally under any pressure above 15 psig , must be hydrostatically tested and date stamped every A ) 1 year B ) 2 years C ) 3 years D ) 5 years: D
    1. Which refrigerant ( s ) must be recovered before opening a system or disposing of a system? A ) R - 410A B ) R - 407C C ) R - 134a D ) all refrigerants must be recovered: D
    1. To obtain an accurate vacuum readings during system evacuation , the system vacuum gauge should be located A ) at the pump discharge. B ) as far from the vacuum pump as possible. C ) directly at the pump suction .. D ) anywhere in the evacuation service hose .: B

13 / 31 , usually calibrated to read from : A ) 200 microns to 0 psi. B ) 0 to 250 psi. C ) 0 to 500 psi. D ) 200 psi to 750 psi .: C

    1. is the process that returns refrigerant to new - product specifications and that requires chemical analysis? A ) recovery B ) recycle C ) reclaim D ) reprocess: C
    1. A cylinder with a gray body and a yellow top indicates that the cylinder is designed to hold : A ) nitrogen. B ) inert gas. C ) only R - 12. D ) recovered refrigerant .: D
  3. 64 HCFC refrigerants A ) are more harmful to stratospheric ozone than CFCs . B ) do not damage stratospheric ozone at in any way. C ) are less harmful to stratospheric ozone than CFCs. D ) are more harmful than bromide containing compounds.: C
    1. Which type of refrigerant is the most harmful to stratospheric ozone? A ) Refrigerants containing Bromine B ) Refrigerants containing Chlorine C ) Refrigerants containing Hydrogen D ) Refrigerants containing Fluoride: A
    1. According to the EPA , a leak detection methods is consid- ered to be the most effective for locating the general area of a small leak. A

14 / 31 ) standing vacuum test B ) electronic or ultrasonic tester C ) halide torch D ) audible sound: B

    1. Long hoses between the unit and the recovery machine should not be used because they cause : A ) excessive pressure drop. B ) increased recovery time. C ) increased emissions. D ) all of the above .: D
    1. Recovery equipment that relies upon the compressor in the system would be considered: A ) system - dependent. B ) self - contained. C ) system independent. D ) self - sufficient: A
    1. A hermetic compressor must never be operated when A ) the compressor is operating under light load. B ) the compressor is operating under full load. C ) there is a dehydration vacuum in the system. D ) the outdoor temperature is above 125F .: C
    1. " Self - contained " recovery devices : A ) are evacuated recovery cylinders capable of liquid transfer. B ) can capture liquid and / or vapor refrigerant without the assistance of components in the air - conditioning or refrigeration equipment. C ) have a self - contained power source that requires recharging or battery replacement. D ) can only be used on air - conditioning and refrig- eration equipment containing less than 15 pounds of refrigerant .: B
    1. Systems charged with R - 410A should be leak checked with : A ) CFCs. B

16 / 31 tank .: B

    1. CFC refrigerants are so named because they contain the elements : A ) chlorine , fluorine , carbon B ) chlorine , fluorine , calcium C ) carbon , fluoride , calcium D ) chlorine , fluorine , hydrogen: A
    1. Before you dispose of any system containing a refrigerant , you must A ) recover the refrigerant. B ) purge the system with nitrogen. C ) flush the system with R - 11 or R - 113 D ) seal the system so no refrigerant can during disposal .: A
    1. According to EPA regulations , which of the following is procedures is not an approved technique for system cleanup after a burnout? A ) installing a suction - line filter - drier B ) flushing with liquid refrigerant clean tubing C ) triple evacuation D ) deep vacuum evacuation: B
    1. When using nitrogen to pressurize a system , you should always A ) Charge nitrogen as a liquid. B ) Charge through a pressure regulator. C ) Pressurize to above 1000 pounds. D ) Never use nitrogen inside the system .: B
    1. 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: D

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    1. Non - Azeotropic refrigerants leak from a system : A ) faster than other refrigerants. B ) in uneven amounts due to different vapor pressures. C ) slower than other refrigerants. D ) only if the joint fails completely .: B
    1. An example of an HCFC refrigerant is : A ) R - 410A B ) R - 22 C ) R - 114 D ) R - 717: B

19 / 31 ) can cause asphyxia. C ) is a Class I refrigerant. D ) can be detected by its color .: B

    1. A system is dehydrated to : A ) remove oil and oil vapor. B ) remove water and water vapor. C ) remove refrigerant and refrigerant vapor. D ) none of the above: B
    1. According to the EPA , of the refrigerants listed below , which types of refrigerants will not contribute to Global Warming? A ) CFCs B ) HCFCs C ) HFCs D ) They all contribute to Global Warming: D
    1. The type of oil that is most commonly used in stationary air conditioning applications with HFC - 410A refrigerant is : A ) ester oil. B ) alkylbenzene oil. C ) mineral oil. D ) all oils are compatible with HFC - 410A: A
    1. Technicians receiving a passing grade on the Type II ( medium - pressure , high - pressure and very high pressure ) exam are certified to recover refriger- ant during the maintenance , service , or repair of medium- and high - pressure equipment and very high pressure refrigerants. including : A ) CFC - 13. B ) HFC
  • 410A. C ) CFC - 503. D ) With Type II certification , you are certified for all very high pressure refrigerants including CFC- 13 and CFC - 503 .: D
    1. Personal protective equipment ( gloves , safety glasses , safety shoes , etc. ) should always be worn is when : A ) reporting for work. B ) handling and filling

20 / 31 refrigerant cylinders. C ) climbing ladders. D ) lifting .: B

    1. Refrigerant vapors or mist should not be inhaled because : A ) they are addictive. B ) they can lower the body's core temperature. C ) they may cause skin cancer. D ) they may cause heart irregularities and / or unconsciousness .: D
    1. Of the items listed below , which is ( are ) violation ( s ) of the Clean Air Act ? A ) falsifying or failing to keep required records B ) failing to reach required evacuation levels before opening or disposing of appliances C ) knowingly re- leasing CFC or HCFC refrigerants or their substitutes while repairing appliances D ) all of the above: D
    1. HFC refrigerants contain : A ) helium , fluorine , carbon. B ) helium , fluorine , calcium. C ) hydrogen , fluorine , chlorine. D ) hydrogen , fluorine , carbon .: D
    1. Which refrigerant contains an HCFC? A ) R - 12 B ) R - 22 C ) R - 134a D ) R
  • 410A: B
    1. Recovery equipment that relies upon the pressure of the refrigerant in the appliance would be considered : A ) system - dependent. B ) self - contained