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EPA 608 NEC 2023

EPA 608 Core Exam Practice Test 8

Free Online EPA 608 Core Exam Practice Test 8This free 25-question practice test covers core EPA 608 topics for refrigerant certification. Topics include atmospheric layers, blended refrigerant fractionation, CFC refrigerant identification, technician certification rules, manifold gauge colors, heat flow, refrigeration cycle pressure components, AHRI 700 purity standard, Section 609 MVAC, system-dependent recovery, electronic leak detectors, recovery speed factors, evacuation hose sizing, recovery cylinder fill limits, and nitrogen pressure regulators. New questions cover azeotropic vs zeotropic blends, subcooling, superheat, EPA 608 exam structure, flash gas, receiver tanks, temperature glide, refrigerant scales, and compressor oil types.

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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: The troposphere is the layer we live in; the ozone layer is in the STRATOSPHERE. Blended refrigerants leak at uneven rates (fractionation) due to different vapor pressures. R-12 is a CFC. Yellow hose = center (utility) port. Heat flows from HOT to COLD always. Condenser and evaporator do NOT change pressure — only the compressor and expansion valve do. AHRI 700 = purity standard for reclaimed refrigerant. Electronic detectors are preferred for small leaks. Recovery cylinders must NOT exceed 80% of water capacity. Always use a pressure regulator with nitrogen.

25

Questions

45 min

Time

70%

Pass

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EPA 608 Core Exam Practice Test 8 — Question List

Question 1: Which of the following layer of earth atmosphere that surrounds us?

Troposphere
Stratosphere
Hemisphere
None

Question 2: A blended refrigerant charged in a system may leak ___________.

Faster than other systems
Slower than other systems
At uneven rates due to different pressures
At the coupling points only

Question 3: Which refrigerant is a CFC?

R-12
R-500
R-124
R-410 A

Question 4: If a technician fails to demonstrate proper recovery and reclaiming procedures when the EPA requires it, ___________.

The technician certificate will be revoked
The recovery equipment and recovery cylinders will be seized
The cylinders recently purchased and still in his possession will be seized
The technician will be advised to attend refrigeration training camp

Question 5: Which of the following is usually central port of the manifold gauge?

Yellow hose
Red hose
Blue hose
White hose

Question 6: Heat flows from a material at _ to a material at _.

higher temperature, lower temperature
lower temperature, higher temperature
higher pressure , lower pressure
lower pressure to higher pressure

Question 7: Which of the following refrigeration circuit components does not modify the pressure of the refrigerant?

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

Question 8: What is the purity standard that the reclaimed refrigerant should meet to be resold or reused in any other system?

ARI 700
ARI 741
EPA 608
EPA 609

Question 9: Only ___________ technicians can purchase CFC-12 refrigerant in small containers for automotive A/C service.

EPA Section 609 certified
EPA Section 608 certified
EPA section 608 type 1 certified
EPA section 608 type 2 certified

Question 10: A recovery device that uses the appliance's own compressor to assist in refrigerant recovery is called a ___________.

Self-contained recovery machine
System dependent recovery machine

Question 11: What is the preferred detector for detecting the small refrigerant leaks?

Electronic detector
Halide leak detector
Ultrasonic leak detector
Fluorescent Dye Leak Detector

Question 12: The speed of refrigerant recovery depends on ___________.

Size of the refrigeration circuit only
Ambient temperature only
Type of refrigerant only
Size of circuit and ambient temperature

Question 13: What should be followed with a gauge set hose to be used in evacuating a system?

Hose length should be smaller
Hose diameter should be equal to vacuum pump inlet or larger
Hoses should be fitted with low loss fittings
Hose diameter should be less than vacuum pump inlet

Question 14: EPA regulations require that refrigerant recovery cylinders must NOT be filled to more than ___________ of their total water capacity.

80%
85%
90%
95%

Question 15: Pressurized nitrogen must always be charged into a refrigerant system through a ___________.

Metering device to monitor the pressure
Pressure regulator to control the pressure
On/Off valve to cut-off when required pressure is reached
Compressor to increase the nitrogen pressure

Question 16: An azeotropic refrigerant blend (such as R-500 or R-502) behaves differently from a zeotropic blend because it ___________.

Requires liquid charging to prevent fractionation
Behaves like a single refrigerant with no temperature glide and no fractionation
Has a wider temperature glide than zeotropic blends
Must always be recovered separately from other refrigerants

Question 17: In a refrigeration system, "subcooling" refers to ___________.

The temperature drop across the expansion valve
Cooling the liquid refrigerant below its saturation temperature before the expansion valve
Adding extra refrigerant to a system to reduce high-side pressure
The difference between suction and discharge temperatures

Question 18: In a refrigeration system, "superheat" refers to ___________.

Overheating the compressor motor windings
The degrees the suction vapor has been heated above its saturation temperature
The temperature increase across the condenser
Adding extra heat to the refrigerant before it enters the evaporator

Question 19: The EPA 608 technician certification examination is divided into how many sections, and what are they?

2 sections — Core and Practical
3 sections — Type I, Type II, and Type III
4 sections — Core, Type I, Type II, and Type III
5 sections — Core, MVAC, Type I, Type II, and Type III

Question 20: "Flash gas" in a refrigeration system is formed at the ___________ and serves what purpose?

Compressor — hot discharge gas that enters the condenser
Condenser — vapor that does not condense to liquid
Expansion valve — a portion vaporizes to instantly cool the remaining liquid
Evaporator — gas that forms when refrigerant absorbs too much heat

Question 21: What is the purpose of a "receiver" (liquid receiver) in a refrigeration system?

To recover refrigerant from the system during service
To store extra liquid refrigerant and ensure a steady, bubble-free supply to the expansion valve
To separate oil from refrigerant before it returns to the compressor
To cool the refrigerant between the compressor and condenser

Question 22: "Temperature glide" in a zeotropic refrigerant blend means that ___________.

The refrigerant temperature rises as it flows through the system
The blend evaporates and condenses over a range of temperatures at constant pressure
The refrigerant glides from the liquid line to the suction line without changing temperature
Different refrigerants in the blend reach the compressor at different times

Question 23: When charging refrigerant into a system by weight, what instrument is required?

A manifold gauge set to monitor pressure while charging
An electronic digital refrigerant charging scale
A thermometer to verify the system is at the correct temperature
A flow meter to measure refrigerant volume

Question 24: Which type of compressor oil is required in systems using HFC refrigerants such as R-410A or R-134a?

Mineral oil
Polyolester (POE) oil
Motor oil (SAE 30)
Polyalkylene Glycol (PAG) oil

Question 25: Under EPA Section 608, who is allowed to purchase refrigerant in containers larger than 2 pounds?

Anyone who is at least 18 years old
Only EPA Section 608 certified technicians
Certified technicians AND licensed HVAC contractors
Only Universal-certified technicians (all four sections passed)

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)