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EPA 608 NEC 2023

EPA 608 Core Exam Practice Test 10

Free EPA 608 Core Exam Practice Test 10. 25 questions covering CFC service sources after 1995, atoms that destroy ozone, compressor function, manifold gauge pressure units, disposable cylinder disposal, R-22 pressure classification, electronic leak detector sensitivity, CFC-12 retrofit refrigerant, suction line filter dryers, moisture in refrigerant, dehydration verification, disposable cylinder rules, oxygen prohibition, refrigerant ODP comparison, azeotropic blend charging, R-410A pressure, POE oil, acid testing, filter dryers, triple evacuation, micron gauges, cylinder hydrostatic testing, R-410A retrofit, open flames, and technician certification.

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The EPA 608 certification is required by law for any technician who purchases or handles refrigerants. It covers safe handling, leak detection, recovery, and environmental regulations.

Type I covers small appliances (≤5 lbs refrigerant), Type II covers high-pressure systems, Type III covers low-pressure systems, and Universal covers all three. Most HVAC technicians pursue Universal certification.

You must score at least 70% on each section of the exam. The Universal exam has four parts: core, Type I, Type II, and Type III.

Key facts for this test: R-22 (HCFC-22) IS a high-pressure refrigerant — it saturates at about 121 psig at 70°F and is used in Type II equipment. Among common refrigerants, R-134a has the lowest ODP (zero) because it contains no chlorine. Bromine atoms actually destroy MORE ozone per atom than chlorine atoms. Electronic leak detectors must have a sensitivity of at least 5 grams per year. R-134a is the leading retrofit candidate for R-12 because it is non-toxic, non-flammable, has zero ODP, and has similar operating pressures.

25

Questions

45 min

Time

70%

Pass

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EPA 608 Core Exam Practice Test 10 — Question List

Question 1: To service or refill the existing the CFC refrigeration systems in USA, the CFC should come from ……………… after 1995 onwards

Recovery and recycling
Solvent conversion
From approved chemical laboratories
European chemical manufactures

Question 2: Which atoms can destroy more ozone molecules when they react with them?

Chlorine
Bromine
Nitrogen
Carbon

Question 3: ………….. is responsible for specific flow rates and pressure in the refrigeration circuit.

Compressor
Condenser
Evaporator
Expansion valve

Question 4: The low pressure gauge reads the system pressures above atmospheric pressure in ………….

Pounds per Square Inch (PSIG)
Inches of mercury (in.Hg)
Pounds per Square Inch absolute (PSIA)
Kilo Pascal (Kpa)

Question 5: What should be the typical pressure of disposable recovery cylinder before disposing it?

Zero
Low pressure below 10 psig
Below 20 psig
Below 14.2 psig

Question 6: HCFC-22 is a high pressure refrigerant.

True
False

Question 7: Electronic leak detector must have a sensitivity of …………………

5 g per year
10 g per year
15 g per year
20 g per year

Question 8: Which of the following refrigerant is leading candidate for CFC-12 retrofit?

R-22
R-134a
R-234
R-500

Question 9: What should be placed in the system to prevent any debris that may damage the compressor?

A suction line filter dryer
An accumulator
A regulatory valve
Moisture cleaner

Question 10: What does happen to system if moisture is still left in an operating system?

Moisture mixes with oil and refrigerant and produces the acids
Increases the pressure in condenser and affects heat transfer
Operating compressor with moisture may damage the compressor motor windings
Damages the evaporator coil

Question 11: With what the technician can conclude that the system is fully dehydrated?

When the low pressure gauge reads deep vacuum
When the pressure reading does not rise even after the vacuum pump is turned off
When system pressure reading is normal in low pressure gauge
When the shutoff valves are closed due to low deep vacuum during evacuation

Question 12: In case of recovery cylinders are not available, the disposable cylinders can be used as recovery cylinders after proper testing and approval

True
False

Question 13: When leak checking the refrigeration system never pressurize the system with ………….

Nitrogen
Oxygen
Hydrogen
Helium

Question 14: Which of the following refrigerants has the lowest ozone depletion potential (ODP)?

R -11
R-22
R-134a
R-12

Question 15: Which of the following refrigerant blend can also be charged as vapour?

Alkylbenzene
Zeotropic
Azeotropic
Near-azeotropic

Question 16: R-410A operates at approximately how much higher pressure than R-22?

About the same pressure as R-22
About 60–70% higher pressure than R-22
About 10% higher pressure than R-22
About 200% higher pressure than R-22

Question 17: Which type of compressor oil must be used in systems that use HFC refrigerants such as R-410A or R-134a?

Mineral oil
Polyolester (POE) oil
Alkylbenzene (AB) oil
PAG oil

Question 18: After a compressor burnout in a refrigeration system, what should the technician do to check for acid contamination?

Replace the compressor immediately without testing
Take an oil sample and test it with an acid test kit
Add more refrigerant to dilute any acid
Purge the system with oxygen to remove acid

Question 19: What is the main job of a filter dryer (liquid line drier) in a refrigeration system?

To separate oil from refrigerant
To remove moisture and solid contaminants from the refrigerant
To cool the refrigerant between the compressor and condenser
To store extra refrigerant when the system load is low

Question 20: The triple evacuation method is used to ___________.

Recover refrigerant three times to ensure all is removed
Remove moisture more effectively by breaking vacuum with dry nitrogen between pulls
Test a system three times for leaks before charging
Charge a system in three stages to prevent frost

Question 21: What instrument is used to measure how deep a vacuum has been pulled in a refrigeration system during evacuation?

A compound manifold gauge set
A micron gauge (electronic vacuum gauge)
A digital thermometer
A clamp-on ammeter

Question 22: How often must DOT-approved refrigerant recovery cylinders be hydrostatic tested?

Every year
Every 5 years
Every 10 years
No testing required

Question 23: Can R-410A be used as a direct drop-in replacement for R-22 in an existing R-22 air conditioning system?

Yes — just replace the refrigerant and the system will work fine
No — R-410A requires different equipment, oil, and operates at much higher pressure
Yes — but only in systems made after 1995
Yes — if a new expansion valve is installed first

Question 24: Why should you never use an open flame or lit halide torch detector near HFC refrigerants?

HFCs are highly flammable and will ignite
Burning HFCs produces toxic gases including hydrogen fluoride
The flame will make the refrigerant evaporate too quickly
Open flames are only dangerous with CFCs, not HFCs

Question 25: How long is an EPA Section 608 technician certification valid?

Valid for 1 year, must be renewed annually
It never expires — certification is permanent once earned
Valid for 5 years, then a refresher exam is required
Valid until age 65

Study Tip: The EPA 608 exam is closed book. Memorize: recovery is required before opening any refrigerant system. Venting refrigerant is illegal. Know the ODP and GWP values for R-22, R-410A, R-134a, R-32, and R-454B.

EXAM CARD EPA 608

Questions25

Time limit45 min

Pass score70%

RegulationEPA Section 608

DifficultyIntermediate

Last reviewedJun 2026

Timer starts immediately. Progress is auto-saved.

Source: EPA Section 608 (40 CFR Part 82)