EPA 608 Exam Test Free Online Quiz 2026 Technician Certification Core Practice Test

Last Updated on February 9, 2026

EPA 608 Exam Test 2026: Technician Certification Core Practice Test Prep Guide: Enhance your readiness for the EPA (Environmental Protection Agency) 608 Technician Certification with our targeted practice test prep guide. This comprehensive resource features 50 sample multiple-choice questions drawn from the Section 608 Certification Exam Preparatory Manual, 9th Edition, Version 2.

Our guide is meticulously designed to cover all the core areas of the EPA 608 certification exam, ensuring you have the knowledge and skills necessary to excel. Dive into our practice test to assess your understanding and identify areas where further study may be needed before taking the actual certification exam.

EPA 608 Exam Test Prep

EPA stands for	Environmental Protection Agency
Test Name	EPA Certification Test Prep
Section Name	608
Type of test	sample test
Type of question	multiple-choice
Answers availability	Yes
Total question	45
Time limit	N/A
Topics	EPA 608 Core
See also	EPA 608 Certification Exam Practice Test And Study Guide

Technician Certification Core Practice Test 2026

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EPA 608 Exam Core Practice Test 2

EPA 608 Exam Core Practice Test 2

1 / 45

1) Will refrigerant migrate to the crank case in a compressor?

A) Refrigerant seeks the lowest point in the system, the compressor crankcase.

B) Refrigerant vaporizes and does not collect in the compressor.

C) Oil migrates to the compressor crankcase.

D) Refrigerant will migrate towards the compressor crank case while the oil will not

Refrigerant tends to migrate to the lowest point in the system, which is usually the compressor crankcase.

2 / 45

2) What things should you look for in equipment and systems to help limit refrigerant emissions?

A) Equipment used is approved by the EPA

B) Leak check, repairing leaks

C) Making sure that all fittings are tight during service and recovery

D) All the above

To limit refrigerant emissions, ensure equipment is EPA-approved, check and repair leaks, and ensure all fittings are tight during service and recovery.

3 / 45

3) What is the most effective method for checking for small leaks?

A) Leak noise

B) Refrigerant dye

C) Pressurize with nitrogen

D) Halide torch

Using a halide torch is an effective method for checking small leaks as it changes color in the presence of refrigerant.

4 / 45

4) R-134A is a “drop in” refrigerant for?

A) R-12

B) R-22

C) R-11

D) R-134A is not a drop-in refrigerant

R-134A is not considered a "drop-in" replacement for other refrigerants because it requires different oils and system modifications.

5 / 45

5) Will the gases in a ternary blend leak at the same rate and why or why not?

A) They leak at different rates because they retain their different vapor pressures.

B) They leak at the same rate. A leak is a leak.

C) Ternary blends have the same vapor pressure.

D) All the above

The gases in a ternary blend leak at different rates due to their varying vapor pressures.

6 / 45

6) How is recycling different from reclaiming?

A) Recycling must be performed by a recycling plant

B) Recycle is to clean

C) Reclaim is to process refrigerant to the level of new product specifications

D) b and c

Recycling cleans the refrigerant for reuse, while reclaiming processes it to meet new product specifications.

7 / 45

7) What do the letters in “HCFC” stand for?

A) High Carbon Fluorine Chlorine

B) hydrochlorofluorocarbons

C) Harmful Carbon Fluorine Chlorine

D) highchlorinefluorocarbon

HCFC stands for hydrochlorofluorocarbons, which are a group of chemicals used in refrigerants that contain hydrogen, chlorine, fluorine, and carbon.

8 / 45

8) Who can purchase refrigerants and what size cylinders can be purchased?

A) Only certified technicians may purchase refrigerants as of November 14, 1994

B) The smallest cylinder a 608 certified technician may purchase is 20 lbs

C) A certified technician can purchase HCFC

D) All the above

Only certified technicians can purchase refrigerants, and this regulation has been in effect since November 14, 1994.

9 / 45

9) Where do CFC refrigerants come from for equipment servicing of older systems?

A) DuPont

B) Government warehouse

C) Recovery and recycling

D) Imported from South America

CFC refrigerants for older systems are obtained through recovery and recycling.

10 / 45

10) To recover refrigerant is to?

A) Remove a 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

B) Reduce contaminants in used refrigerant by oil separation through filter dryers.

C) Reprocess refrigerant to new product specifications

D) Remove refrigerant and change ownership.

Recovering refrigerant involves removing it from a system and storing it in an external container without processing it.

11 / 45

11) What incentive do others have to turn you in for violating the CAA?

A) An award of up to $10,000 is offered by the EPA

B) An award of up to $100,000 is offered by the EPA

C) An award of up to $1,000 is offered by the EPA

D) None of the above

The EPA offers a reward of up to $10,000 to individuals who report violations of the CAA.

12 / 45

12) What characteristics make it easy for CFCs to reach the stratosphere and how do they get there?

A) CFCs are lighter than air atoms and rise into the Stratosphere.

B) CFCs will not dissolve in water or break down into compounds that dissolve in water. Wind moves them into the Stratosphere

C) Heating of the CFCs makes them lighter than air.

D) a and c

CFCs are stable and do not dissolve in water, allowing them to remain in the atmosphere and be carried to the stratosphere by wind.

13 / 45

13) Name reasons recovery is important?

A) To have adequate supplies of refrigerant for service after production bans

B) Prevent venting to the atmosphere

C) Prevent stratospheric ozone depletion

D) All the above

Recovery is crucial for maintaining refrigerant supplies, preventing atmospheric venting, and protecting the ozone layer.

14 / 45

14) The component of an air conditioning system that changes a low pressure vapor to a high pressure vapor is the?

A) Condenser

B) Metering device

C) Evaporator

D) Compressor

The compressor increases the pressure of the refrigerant vapor from low to high.

15 / 45

15) What is the Montreal Protocol?

A) Treaty between Canada and the US to limit use of refrigerants

B) Treaty among nations designed to protect the stratospheric ozone layer.

C) Method to clean the air developed in Montreal

D) Carbon regulation

The Montreal Protocol is an international treaty designed to protect the ozone layer by phasing out the production of numerous substances responsible for ozone depletion.

16 / 45

16) What evidence do we have that CFCs and HCFCs are depleting the ozone?

A) The rise in the amount of chlorine measured in the stratosphere over the past two decades matches the rise in the amount of fluorine.

B) The rise in the amount of chlorine measured in the stratosphere over the past two decades matches the rise in CFC emissions over the same period.

C) Samples of air taken from the stratosphere over erupting volcanoes show that volcanoes contribute a small quantity of chlorine to the stratosphere compared to CFCs.

D) All the above

The correlation between the rise in chlorine in the stratosphere and the increase in CFC emissions provides evidence of ozone depletion.

17 / 45

17) The condition and state of the refrigerant leaving a receiver is?

A) Subcooled liquid

B) Subcooled vapor

C) Superheated vapor

D) Superheated liquid.

The refrigerant leaving a receiver is in a subcooled liquid state, meaning it is a liquid at a temperature lower than its boiling point.

18 / 45

18) What will need to happen if the oil has been contaminated by a burnout?

A) Triple evacuate the system

B) Install a permanent filter-drier

C) Conduct a deep vacuum before recharging

D) All the above

If oil is contaminated by a burnout, triple evacuation, installing a permanent filter-drier, and conducting a deep vacuum are necessary.

19 / 45

19) How is recovery different from recycling?

A) Recycle is to clean refrigerant for immediate reuse

B) Recover is to remove refrigerant in any condition from a system and store it in an external container

C) There is no difference

D) a and b

Recovery involves removing refrigerant from a system and storing it, while recycling involves cleaning the refrigerant for immediate reuse.

20 / 45

20) Explain how cooling of a space occurs in a refrigeration cycle

A) The indoor air is cooled

B) Heat is removed from inside the building and is deposited outside the building

C) Liquid refrigerant absorbs the heat and transfers it to the exterior.

D) Cold liquid refrigerant cools the indoor air.

Cooling occurs by removing heat from inside the building and depositing it outside.

21 / 45

21) What is the purpose of the CAA?

A) Regulate California Air quality

B) Clean the air in the US

C) Limit how much of a pollutant can be in the air in the US

D) Regulate Civil Aeronautics

The Clean Air Act (CAA) aims to limit the amount of pollutants in the air in the United States.

22 / 45

22) What three things can happen if you violate the CAA?

A) Fine up to $27,500 per day, per violation

B) May lose your certification to handle refrigerants

C) May need to appear in US Federal Court for the charges

D) All the above

Violating the CAA can result in significant fines, loss of certification, and legal consequences.

23 / 45

23) What chemicals does the Montreal Protocol control?

A) chlorofluorocarbons (CFCs), halons

B) carbon tetrachloride

C) methyl chloroform

D) All the above

The Montreal Protocol controls the production and use of CFCs, halons, carbon tetrachloride, and methyl chloroform.

24 / 45

24) Why do we now use R-134a refrigerant?

A) It costs less

B) HFCs do not contain any chlorine

C) It is a drop in replacement for R-22

D) It is a drop in replacement for R-11

R-134a is used because it is an HFC refrigerant that does not contain chlorine, making it less harmful to the ozone layer.

25 / 45

25) How can you test a system for leaks?

A) Evacuate the system and pull a vacuum on it

B) Use a hydrostatic test

C) Pressurize with oxygen

D) Use water pressure

Evacuating the system and pulling a vacuum can help test for leaks.

26 / 45

26) What are types of recovery equipment used?

A) System dependent

B) Self-contained

C) Container less

D) a and b

Both system-dependent and self-contained types of recovery equipment are used.

27 / 45

27) What type of oil is used in R-134a and what oils will mix with it?

A) Ester based oils

B) Ester based oils do not mix with other oils.

C) Synthetic alkylbenzene lubricant

D) a and b

Ester-based oils are used with R-134a refrigerants and do not mix with other oils.

28 / 45

28) What are three things the center hose is used for and what color is it usually?

A) Red, high pressure, low pressure and vacuum

B) Yellow hose and can be connected to a recovery device, evacuation vacuum pump or charging device

C) Blue, low pressure, vacuum and recovery

D) Green, recovery, vacuum, low and high pressure

The center hose is usually yellow and is used for recovery, evacuation, and charging.

29 / 45

29) Are there "drop-in" replacements for R-12 systems and if not, why?

A) There is no “drop-in” replacement gas for R-12

B) New refrigerants are incompatible with the oils and lubricants used in R-12

C) 134A uses a different oil than R-12

D) All the above

There are no "drop-in" replacements for R-12 because new refrigerants are not compatible with the oils and lubricants used in R-12 systems.

30 / 45

30) What must be done before scrapping a refrigerant container?

A) Release the refrigerant

B) Recover to (0 psig) or lower and rendered useless

C) Punch a hole in the container

D) Add compressed air.

Before scrapping, refrigerant containers must be recovered to 0 psig or lower and rendered useless.

31 / 45

31) What color is the high pressure gauge?

A) Blue and measures high pressure

B) Red and measures the high side (discharge) pressure

C) Red and measures low side pressure

D) Yellow and measures high pressure.

The high-pressure gauge is red and measures the high side (discharge) pressure.

32 / 45

32) What does a compressor compress?

A) Liquid refrigerant

B) Hot vapor

C) High pressure vapor

D) Low pressure, low temperature vapor

A compressor compresses low-pressure, low-temperature vapor into high-pressure vapor.

33 / 45

33) What should you look for if a compressor burns out?

A) Frayed wires

B) Check paint on compressor body

C) Strong smell in refrigerant

D) Melted tubing

A strong smell in the refrigerant can indicate a compressor burnout.

34 / 45

34) What three things is the CAA doing to control chlorofluorocarbon emissions?

A) Set dates to phase out CFC’s and HCFC’s

B) Prohibit venting of CFC and HCFC

C) Require the EPA to set standards for recovery of refrigerants prior to appliance disposal

D) All the above

The CAA addresses CFC and HCFC emissions by phasing them out, prohibiting venting, and setting recovery standards.

35 / 45

35) The rule of thumb for refilling approved cylinders is a maximum of ___ percent liquid?

A) 60%

B) 79%

C) 80%

D) 90%

Refrigerant cylinders should not be filled beyond 80% to allow for expansion of the liquid refrigerant.

36 / 45

36) Who is responsible for removing refrigerants from a system that is being disposed of?

A) HVACR tech

B) EPA

C) Original owner

D) Final person in the disposal chain

The final person in the disposal chain is responsible for removing the refrigerants.

37 / 45

37) How should you handle recovery of a system that has mixed refrigerants?

A) Recover into a separate tank

B) Vent the refrigerant

C) Call the EPA

D) Call the police

Mixed refrigerants should be recovered into a separate tank to prevent contamination.

38 / 45

38) What should you tell a consumer who complains about the added cost and time of recovering refrigerant?

A) Recovery is the law.

B) Recovery is necessary to protect human health and the environment.

C) All professional service personnel are duty bound to follow the law and protect the environment.

D) All of the above

It is important to inform the consumer that recovery is required by law and is necessary for environmental and health protection.

39 / 45

39) What is ODP?

A) Oxygen Destruction Properties

B) Ozone Depletion Potential

C) Ozone Destruction Properties

D) Oxygen Depletion Potential

ODP stands for Ozone Depletion Potential, a measure of how much a substance can deplete the ozone layer.

40 / 45

40) Name some of the health and environmental effects of ozone depletion.

A) Increased Temperature of the Earth

B) Increased Cases of Skin Cancer

C) Increased numbers of Cataracts in the eyes

D) All the above

Ozone depletion can lead to increased temperatures, higher rates of skin cancer, and more cases of cataracts.

41 / 45

41) What can states do in addition to the CAA?

A) Enforce standards more strict than the CAA laws

B) Nothing

C) States can create their own laws.

D) All of the above

States have the authority to enforce standards that are stricter than those set by the CAA.

42 / 45

42) When was the CFC phase out date?

A) November 31, 2003

B) December 31, 1995

C) November 15, 1990

D) November 15, 1993

The production and import of CFCs were phased out by December 31, 1995, under the Montreal Protocol.

43 / 45

43) What color is the compound gauge and what does the compound gauge measure?

A) Blue and measures low pressure (psig) and vacuum (inches Hg)

B) Red and measures head pressure

C) Yellow and measures vacuum.

D) Green and measures temperature and pressure.

The compound gauge is blue and measures low pressure and vacuum.

44 / 45

44) What must be done before disposing of an appliance containing CFCs or HCFCs?

A) Identify refrigerant by attaching DOE tag.

B) Identify refrigerant by attaching CAA tag

C) Identify refrigerant by attaching EPA tag

D) Refrigerant must be recovered

CFCs or HCFCs must be recovered from appliances before disposal.

45 / 45

45) What standards must refrigerant recovery equipment meet?

A) Certified and labeled by an EPA approved equipment manufacturer

B) None

C) CAA approval

D) DOT standards and labeling

Refrigerant recovery equipment must be certified and labeled by an EPA-approved manufacturer.

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