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EPA 608 NEC 2023

EPA 608 Core Exam Practice Test 2

Free Online EPA 608 Practice Test( Core Exam)-2

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How this test works

Read each question carefully

Look for absolute words like always / never — they often distinguish the right answer.

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Frequently Asked Questions

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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.

How to Use This Practice Test

This EPA 608 Core Exam Practice Test 2 has 14 questions with detailed answers and NEC references. Take the full test, review every wrong answer, and look up the NEC article it references before moving on.

Tip: The EPA 608 exam is NOT open book — memorize refrigerant ODP/GWP values and recovery rules before the exam.

Topics covered: Refrigerant regulations, recovery procedures, leak detection, and refrigerant properties.
Passing score: 70% required on each section. Universal certification requires passing all four sections.
Questions: 14 multiple-choice, one correct answer each

14

Questions

21 min

Time

70%

Pass

Timer starts immediately. Progress is auto-saved.

EPA 608 Core Exam Practice Test 2 — Question List

Question 1: In a refrigerant system the function of compressor is to change ………………….

Low pressure vapor to high pressure vapor
High pressure vapor to low pressure vapor
Low pressure liquid to high pressure liquid
High pressure liquid to low pressure liquid

Question 2: .................. refrigerant has highest global warming potential

R-11
R-22
R-123
R-134a

Question 3: Which of the refrigerant has no 'drop-in' replacement gas?

R-12
R-134a
R-234
R-22

Question 4: The temperature difference of refrigerant is across condenser is almost constant.

True
False

Question 5: Which of the following oil used for use with R-22 refrigerant system?

Mineral oil
Alkylbenzene
Polyoester
polyethylene

Question 6: Charging a blend refrigerant should be done as a ...............

vapor
liquid
two phase vapor and liquid

Question 7: Which of the following refrigeration system component converts high pressure liquid in to low pressure liquid?

Expansion valve
Evaporator
condenser
compressor

Question 8: Which of the following compressor should not be operated when there is a vacuum in the system?

Hermetic compressor
Screw compressor
Rotary compressor
Scroll compressor

Question 9: The refrigerant storage tanks are painted .......................

yellow with grey tops
yellow with red tops
grey with yellow tops
red with yellow tops

Question 10: HFC's have no ozone depletion potential because ................................

It does not contain carbon atom
it does not contain chlorine atom
it does not contain oxygen atom

Question 11: Even for small appliances EPA requires to repair leaks with in 10 days.

True
False

Question 12: A DOT classification tag should be there on refrigerant cylinder for ................

transportation purpose
reusable purpose
recyclable purpose
recovery purpose

Question 13: Ozone molecule in stratosphere consists of ........................ atoms.

Three oxygen atoms
Two oxygen atoms
Two carbon atoms
Three carbon atoms

Question 14: What is approximate oxygen percentage in atmosphere?

21 %
28 %
32 %
49 %

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

Questions14

Time limit21 min

Pass score70%

Code editionNEC 2023

DifficultyIntermediate

Last reviewedJun 2026

Timer starts immediately. Progress is auto-saved.

Source: EPA Section 608 (40 CFR Part 82)