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EPA 608 NEC 2023

EPA 608 Core Exam Practice Test 10

Free Online Practice Tests: EPA 608 Core Exam Practice Test-10

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

15

Questions

23 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 lower 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

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

Questions15

Time limit23 min

Pass score70%

Code editionNEC 2023

DifficultyIntermediate

Last reviewedJun 2026

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Source: EPA Section 608 (40 CFR Part 82)