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EPA 608 NEC 2023

EPA 608 Core Exam Practice Test 9

Free EPA 608 Core Exam Practice Test 9. 25 questions covering oxygen explosion danger, CFC density, ozone destruction, refrigeration cycle basics, manifold gauge colors, reclaiming vs recycling, recovery equipment certification, leak detection, drop-in substitutes, evacuation speed, cylinder disposal, suction line icing, recovered refrigerant ownership, Montreal Protocol, CFC phase-out date, recovery cylinder colors, equipment types, leak rate thresholds, Section 608 scope, de minimis exemption, and civil penalties.

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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: Never use oxygen or compressed air to pressurize a refrigeration system — mixing with oil can cause an explosion. One chlorine atom destroys more than 100,000 ozone molecules through a chain reaction. Reclaiming is the highest level of refrigerant processing — it restores refrigerant to AHRI 700 purity standards through chemical testing. Recovery equipment manufactured after November 15, 1993 must be certified by an EPA-approved testing organization. The Montreal Protocol, signed in 1987, led to the global phase-out of CFCs.

25

Questions

45 min

Time

70%

Pass

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EPA 608 Core Exam Practice Test 9 — Question List

Question 1: What will happen if the system is pressurized with oxygen or compressed air?

When mixed with oil or refrigerant they can cause an explosion
When mixed with refrigerant, the pressure in the system will increase unusually
The compressed air can damage the suction line filter placed before the compressor
The oxygen mixture with oil will damage compressor

Question 2: CFC’s are lighter than air.

True
False

Question 3: One chlorine atom can destroy more than ___________ ozone molecules.

1,00,000
10,00,000
10,000
1000

Question 4: The compressor is located in …………… part of the refrigeration circuit?

Vapour
Liquid

Question 5: The liquid boiling point in the closed loop system can be controlled by changing …………… above it.

Vapour temperature
Vapour pressure
Vapour volume
Vapour flow

Question 6: A high pressure gauge in manifold gauge set is usually ………… in color.

red
blue
yellow
white

Question 7: When the air present inside the refrigeration circuit …

The pressure at high pressure side reads unusually high
The pressure at high pressure side reads unusually low
The pressure at Low pressure side reads unusually high
The pressure at low pressure side reads unusually low

Question 8: The process which removes the moisture and oil from and the refrigerant and chemically tests the refrigerant is

Recycling
Reclaiming
Recovery
Disposal

Question 9: Refrigerant recovery equipment manufactured after ……………… must be certified and labeled by the EPA approved equipment testing agency to meet EPA standards

November 15, 1993
July 2, 1987
November 14, 1994
June 16, 1989

Question 10: HFC refrigerant leak cannot be detected by following detector?

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

Question 11: Which of the following refrigerant is drop-in substitute of R-12?

R-22
R-134a
R-234
none

Question 12: The speed of the evacuation depends on

Size of the system
Ambient temperature
Quality of the moisture
All

Question 13: For maximum security what should be done to the cylinder before disposal?

Recovery the remaining refrigerant
Heat with the open flame to check for any refrigerant leaks
Cylinder should be punctured

Question 14: The suction line up to the compressor is iced up in air conditioning unit, what would be the indication?

A clean evaporator coil
An improper function of expansion valve
Under charge of refrigerant
Over charge of refrigerant

Question 15: The refrigerant recovered from refrigeration system …………….

without any restriction it can be returned to same or other system owned by same person
can be returned to another system if it is charged with same refrigerant
can be sold to another costumer
can be said it is reclaimed if the oil is filtered

Question 16: The Montreal Protocol — the international agreement to phase out ozone-depleting substances — was signed in what year?

1992
1987
1995
1980

Question 17: CFC refrigerant production in the United States ended on ___________.

November 14, 1994
December 31, 1995
January 1, 2000
July 1, 1992

Question 18: What is the standard color for a DOT-approved refrigerant recovery cylinder?

All yellow
Gray body with a yellow top
All gray
Green body with a white top

Question 19: Under EPA Section 608, Type I equipment refers to ___________.

Large commercial chillers using low-pressure refrigerant
Small appliances containing 5 pounds or less of refrigerant
Any equipment using high-pressure refrigerant above 5 lbs
Motor vehicle air conditioning systems

Question 20: Type III equipment under EPA Section 608 uses low-pressure refrigerants such as ___________.

R-410A or R-404A
R-11 or R-123
R-22 or R-134a
R-32 or R-125

Question 21: For comfort cooling (HVAC) equipment containing 50 or more pounds of refrigerant, the EPA requires leaks to be repaired when the annual leak rate exceeds ___________.

35% per year
15% per year
10% per year
25% per year

Question 22: For commercial refrigeration equipment containing 50 or more pounds of refrigerant, leaks must be repaired when the annual leak rate exceeds ___________.

15% per year
35% per year
25% per year
50% per year

Question 23: EPA Section 608 of the Clean Air Act covers ___________.

Motor vehicle air conditioning (MVAC) systems only
Stationary refrigeration and air conditioning equipment
Both stationary and motor vehicle systems equally
Only commercial refrigeration systems above 50 lbs

Question 24: Under EPA Section 608, which of the following refrigerant releases is allowed as "de minimis"?

Opening a service valve slightly to release pressure before opening the system
Small amounts released when connecting and disconnecting service hoses
Releasing refrigerant when the recovery machine is too slow
Venting HFCs because they have zero ODP

Question 25: Under EPA Section 608, what is the maximum civil penalty for knowingly venting refrigerant?

$1,000 per day per violation
Up to $44,539 per day per violation
$5,000 total maximum
A written warning only — no fine for a first offence

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)