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EPA 608 NEC 2023

EPA 608 Core Exam Practice Test 11

Free EPA 608 Core Exam Practice Test 11. 25 questions covering azeotropic blend characteristics, corroded relief valves, post-evacuation pressure rise, system-dependent vs self-contained recovery, evaporator frost, accumulators, discharge pressure, compound gauge vacuum reading, nitrogen in charged systems, refrigerant purchase certification, leak detection, mixed refrigerant handling, evacuation time factors, recovery cylinder ports, recovered oil disposal, AHRI 700 purity, record-keeping requirements, recovery levels, refrigerant density, phosgene from CFC combustion, UV radiation effects, global warming potential, R-22 vs CFC ozone impact, and purge units.

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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: Only certified technicians may purchase CFC and HCFC refrigerant (as of November 14, 1994). After evacuation, if pressure rises, the system has a leak. Self-contained recovery equipment has its own compressor and does not depend on system pressure. Refrigerant vapors are heavier than air and settle in low areas — always ventilate the work area. Burning CFCs or HCFCs in an open flame creates phosgene gas (COCl₂), which is highly toxic. GWP measures a gas's heat-trapping ability over 100 years compared to CO₂ (baseline = 1).

25

Questions

45 min

Time

70%

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EPA 608 Core Exam Practice Test 11 — Question List

Question 1: …………… blend refrigerant does not exhibit temperature glide and acts as a single refrigerant.

Alkylbenzene
Zeotropic
Azeotropic
Near-azeotropic

Question 2: If corrosion found on the relief valve body then immediately ………

It needs to be replaced
It needs to repaired
It needs to be cleaned
It needs to be reconditioned

Question 3: When a system pressure increases even after the evacuation then ………

The system is ready to be charged
An expansion valve is clogged
They system may be leaking
A mal operation in compressor motor

Question 4: The recovery equipment that depends on the pressure in the refrigeration system is ……….

System-dependant
Self dependant
Self contained
Illegal to use

Question 5: The frost formed on evaporator fins will acts as …………….. between evaporator heat exchanger and surrounding air.

Insulator
Conductor
Semi conductor

Question 6: The accumulator placed in the refrigeration circuit to …………………… directly passing in to the compressor

remove the moisture from the refrigerant
prevent the slug of the refrigerant
control the refrigerant
filter the refrigerant

Question 7: The pressure of the refrigerant at the compressor discharge compared to refrigerant pressure at evaporator outlet is …………….

Higher
Lower
Same
None

Question 8: The compound gauge reads the vacuum in the system in ……….

Pounds per Square Inch (PSIG)
Inches of mercury (in.Hg)
Pounds per Square Inch absolute (PSIA)
Kilo Pascal (Kpa)

Question 9: The nitrogen should not be added to a fully charged system for the purpose of leak detection.

True
False

Question 10: From which year on wards the sale of CFC and HCFC refrigerants is restricted to certified technicians.

November 14, 1994
November 15, 1993
October 21, 1995
July 2, 1992

Question 11: If you cannot find a leak with any leak detector then

charge more refrigerant and increase the pressure which makes the leak sensible by the detector
recover the refrigerant and purge with pressurised dry nitrogen to find the leak
purge the charged system with dry nitrogen to find the leak
add more oil to the system to find the leak.

Question 12: If a technician finds that the refrigerant is mixed

he should recover mixture into a separate container
he should filter the refrigerant and separate them
he should recycle the mixture refrigerant
he should separate and reclaim the refrigerant which can later be charged into system.

Question 13: What happens to the time of evacuation if the refrigerant system capacity and gauge set hose size is large?

Increases
Reduces
Does not effect
None

Question 14: What are the two ports of recovery cylinders?

Liquid and vapour port
Low pressure and high pressure liquid ports
Low pressure and high pressure vapour ports
None

Question 15: The oil is that is recovered during refrigerant recovery

It must send to the recovery agency to clean and make it reusable
The oil can be recovered to separate cylinder for reuse it
The oil cannot be reusable and it should sent for disposable
Recover the oil and refrigerant in the same tank which can be reused

Question 16: Reclaimed refrigerant must meet __________ purity standards before it can be resold or used in another owner's equipment.

ASHRAE Standard 15
AHRI Standard 700
DOT Standard 4BA
EPA Standard 608

Question 17: Under EPA Section 608 regulations, which appliance owners are required to keep records of refrigerant service?

All appliance owners regardless of charge size
Owners of appliances with a refrigerant charge of 50 pounds or more
Only owners of commercial refrigeration equipment
Record-keeping is voluntary, not required

Question 18: What is the required refrigerant recovery level for a high-pressure system manufactured BEFORE November 15, 1993, with a charge LESS than 200 pounds?

15 in.Hg vacuum
0 psig (recover to atmospheric pressure)
10 in.Hg vacuum
4 in.Hg vacuum

Question 19: What is the key feature of self-contained refrigerant recovery equipment that makes it different from system-dependent recovery equipment?

It uses the system's compressor to push refrigerant out
It has its own motor and compressor
It filters and reclaims refrigerant to AHRI 700 standards
It works only on low-pressure systems

Question 20: Refrigerant vapor is heavier than air. What safety risk does this create?

Refrigerant floats to the ceiling and is harmless
Refrigerant accumulates at floor level and can displace oxygen, causing asphyxiation
Refrigerant ignites more easily when mixed with air
Refrigerant becomes more toxic when near the floor

Question 21: What dangerous gas is produced when CFC or HCFC refrigerant contacts an open flame?

Carbon monoxide (CO)
Phosgene gas (COCl₂)
Hydrogen fluoride (HF)
Chlorine gas (Cl₂)

Question 22: Depletion of the stratospheric ozone layer leads to increased UV radiation reaching Earth's surface. Which health effects are linked to increased UV exposure?

Increased respiratory disease and acid rain
Increased rates of skin cancer and cataracts
Greenhouse effect and global warming only
No significant health effects — UV-B is harmless

Question 23: What does GWP (Global Warming Potential) measure?

How fast a gas destroys ozone compared to R-11
How much heat a gas traps in the atmosphere over 100 years compared to CO₂
The flammability rating of a refrigerant gas
The toxicity level of a refrigerant at normal concentrations

Question 24: R-22 (HCFC-22) has a LOWER ozone depletion potential (ODP) than CFC refrigerants like R-11 and R-12. Why is R-22 still being phased out?

R-22 is not being phased out — only CFCs are regulated
Because R-22 still depletes ozone (ODP = 0.055) and has significant GWP
Because R-22 is highly flammable
Because R-22 contains hydrogen which is harmful

Question 25: What is the purpose of a purge unit on a Type III (low-pressure) refrigeration system such as a centrifugal chiller using R-11 or R-123?

To recover refrigerant when the system is opened for service
To remove non-condensable gases (air, nitrogen) that leak into the system
To filter oil out of the refrigerant
To control the refrigerant flow rate through the expansion valve

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)