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EPA 608 NEC 2023

EPA 608 Core Exam Practice Test 13

Free EPA 608 Core Exam Practice Test 13. 25 questions covering the HFC venting prohibition date, HFC ozone depletion potential, pressure changes across refrigeration components, suction line identification, refrigerant temperatures across the cycle, ozone location, manifold gauge color, nitrogen leak testing, chlorine-ozone reaction, blended refrigerant charging, heat release during condensation, recovery before servicing, compound gauge placement, technician certification requirements, R-22 phase-out, halide torch limitations, low charge symptoms, high charge symptoms, safety data sheets, service valve positions, non-condensables, recovery cylinder weighing, nitrogen pressure testing, R-22 vs R-410A pressures, and halide torch colors.

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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: Since November 15, 1995, it is illegal to knowingly vent any refrigerant — CFCs, HCFCs, and HFCs. Only chlorine atoms destroy ozone, which is why HFCs (no chlorine) have zero ODP. Blended refrigerants (zeotropic) must be charged as liquid to maintain the correct blend composition. Before opening or servicing any refrigeration system, the refrigerant must always be recovered first. The low pressure gauge (suction side) is blue; the high pressure gauge (discharge side) is red.

25

Questions

45 min

Time

70%

Pass

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EPA 608 Core Exam Practice Test 13 — Question List

Question 1: Since _____________, knowingly venting any ozone depleting substance OR HFC refrigerant is a violation of the Clean Air Act.

November 15, 1995
December 31, 1995
July 15, 1994
November 14, 1994

Question 2: Why HFC is not having ozone depletion potential (ODP)?

It does not contain carbon
It does not contain chlorine
Its boiling point is not same as CFC
It does not travel up to stratosphere

Question 3: The inlet and outlet pressures of refrigerant is almost same in ………………..

Condenser and evaporator
Compressor and evaporator
Expansion valve and compressor
Condenser and compressor

Question 4: The tubing line connecting evaporator to the intake of compressor is called as ……….

Suction line
Discharge line
Liquid line
Vapor line

Question 5: The refrigerant temperature after the condenser compared to the refrigerant temperature after expansion valve in a vapor compression refrigerant cycle is …………….

Higher
Lower
Same
Reduced to half

Question 6: Ozone gas is located in which of the following earth’s atmosphere?

Stratosphere
Troposphere
Both Stratosphere and troposphere
None

Question 7: What is the color identification of low pressure gauge in manifold gauge set?

Blue
Red
White
Yellow

Question 8: Which of the following should be used to leak check an R-134a refrigeration system?

Pressurised nitrogen
Dry air
Helium
Compressed hydrogen

Question 9: What is the outcome when chlorine atom meets with ozone molecule?

Chlorine monoxide
Carbon dioxide
Chlorine dioxide
Chlorine + oxygen

Question 10: The blended refrigerants should be generally charged ……

as liquid
as vapor
at high temperature
at low pressure

Question 11: A refrigerant in refrigeration system releases heat when ………………….

It is compressed
It evaporates
It condenses
It vaporizes

Question 12: Before opening / servicing a vapor compressor refrigeration system …………

The refrigerant must be released to atmosphere
The refrigerant must be recovered using approved techniques
The refrigerant may be vented if it is HFC
The refrigeration system must be depressurized

Question 13: A compound gauge is connected to …………….

Low side of the system
High side of the system
recovery machine
vacuum pump for evacuation

Question 14: Since November 14, 1994, who is the only person allowed to purchase CFC or HCFC refrigerant in containers larger than 2 pounds?

Any licensed HVAC contractor
A technician certified under EPA Section 608
Anyone who pays for the refrigerant
Only EPA government inspectors

Question 15: After what date was the production and importation of new R-22 (HCFC-22) refrigerant banned in the United States?

July 1, 1992
January 1, 2020
December 31, 1995
January 1, 2010

Question 16: A halide (flame) torch leak detector can ONLY detect which type of refrigerant?

HFCs only (R-134a, R-410A)
Refrigerants that contain chlorine (CFCs and HCFCs only)
All refrigerant types equally
HFCs and HCFCs but not CFCs

Question 17: Which of the following is a symptom of a LOW refrigerant charge (undercharge) in a refrigeration system?

Low suction superheat and high suction pressure
High suction superheat and low suction pressure
High discharge pressure and liquid slugging
Frost on the condenser coil

Question 18: Which of the following is a symptom of an OVERCHARGE (too much refrigerant) in a refrigeration system?

High superheat and low suction pressure
Abnormally high suction pressure and high discharge pressure
Bubbles in the sight glass
Low discharge pressure and high subcooling

Question 19: What document provides health, safety, and handling information for refrigerants and other chemicals used in HVACR service?

Service Diagnostic Sheet (SDS)
Safety Data Sheet (SDS)
System Design Specification (SDS)
Standard Duty Schedule (SDS)

Question 20: A refrigerant service valve that is fully turned clockwise (all the way in) is said to be __________, meaning the compressor port is closed off.

Back-seated
Front-seated
Mid-seated
Cross-seated

Question 21: When non-condensable gases (such as air or nitrogen) are present in a refrigeration system, where do they accumulate?

At the bottom of the evaporator
At the top of the condenser
In the liquid line between condenser and expansion valve
Inside the compressor crankcase

Question 22: What effect do non-condensable gases in a refrigeration system have on the discharge (high-side) pressure?

They cause the discharge pressure to be abnormally LOW
They cause the discharge pressure to be abnormally HIGH
They have no effect on system pressures
They cause both suction and discharge pressures to drop

Question 23: What is the correct method to determine how much refrigerant is in a recovery cylinder?

Check the pressure gauge — higher pressure means more refrigerant
Weigh the cylinder on a scale and subtract the tare weight
Shake the cylinder — a heavy cylinder sounds full
Estimate based on how many systems have been recovered into it

Question 24: Why is it acceptable to use dry nitrogen to pressure-test a refrigeration system for leaks, but NOT acceptable to use oxygen or compressed air?

Oxygen and compressed air are actually the preferred test gases
Oxygen and compressed air can react with refrigerant oil and cause a fire or explosion
Nitrogen is simply cheaper than oxygen or air
Oxygen is acceptable, but compressed air is not

Question 25: What is the AHRI standard color code for R-410A refrigerant cylinders?

Light green
Pink (light rose)
Light blue
Orange

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)