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EPA 608 NEC 2023

EPA 608 Core Exam Practice Test 15

Free EPA 608 Practice Test ( CORE Exam)-15

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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 15 has 13 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: 13 multiple-choice, one correct answer each

13

Questions

20 min

Time

70%

Pass

Timer starts immediately. Progress is auto-saved.

EPA 608 Core Exam Practice Test 15 — Question List

Question 1: What is the advantage of heating the system before evacuating it?

Reduces the dehydration time
increases the efficiency of dehydration
increases the pressure in the system
reduces the refrigerant leakage during evacuation

Question 2: Which of the following refrigerant has lowest Global Warming Potential (GWP)?

R-12
R-134
R-22
R-154a

Question 3: In the evaporator of refrigeration circuit, the refrigerant …………….

Absorbs heat from the surrounding medium.
Releases heat to the surrounding medium.
changes from vapor to liquid
pressure increases

Question 4: The effect of using of large vacuum pump in passive refrigerant recovery system is …………………

Freezes the moisture in the system
Freezes the oil in the system
The refrigerant in the system will freeze
The recovery process will speed up.

Question 5: The flow of refrigerant entering in to evaporator is controlled by ………………

Differential pressure across the expansion valve
Differential temperature across the expansion valve
Differential pressure across the compressor
Differential temperature across the compressor

Question 6: The refrigerant leaving the condenser is ……………………………

High pressure liquid
Low pressure liquid
Low pressure vapour
High pressure vapour

Question 7: What is the maximum typical pressure that a high pressure gauge can read?

500 psig
300 psig
800 psig
1000 psig

Question 8: EPA regulations require that the manifold gauge hoses should be equipped with …………….. to minimize the refrigerant loss when disconnecting the hoses.

Low loss fittings
Tightly bonded fittings
Screw fitted fittings
Regulatory fittings

Question 9: When the pressure readings in high and low pressure gauges is high it indicates that

Air is present in the system
Moisture present in system
Over compression of refrigerant
Insufficient Refrigerant

Question 10: Systems charged with more than 300 kg of HFC must …………..

be leak tested once in month
be fitted with permanent fixed leak detector
be leak tested thrice a year
be leak tested annually

Question 11: In refrigeration circuit which indicates that liquid line filter dryer is blocked?

Bubbling in the slight glass
High pressure reading in liquid line
Low pressure reading in liquid line
Oil leak in the system

Question 12: Which is an important factor when choosing a leak detection method?

Type of refrigerant
Charge capacity of the refrigerant
Pressure of the refrigerant
Material of the refrigeration container

Question 13: Lower ambient conditions around a refrigeration system will ……………. recovery time.

Increase
Decrease

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

Questions13

Time limit20 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)