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EPA 608 NEC 2023

EPA 608 Type II & III Practice Test 3

This test focuses on Type II leak detection methods: electronic leak detectors, UV dye, soap bubble solution, and nitrogen pressure testing. It also compares these methods to the different approach needed on Type III chillers.

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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.

Type II & III Exam Tip: All four common Type II leak detection methods work because the system holds positive pressure. That is not true on a Type III chiller until it is warmed up first.

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25 min

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EPA 608 Type II & III Practice Test 3 — Question List

Question 1: Which leak detection method uses a dye that glows under a special light?

Soap bubble solution
Electronic leak detector
UV dye
Nitrogen pressure test

Question 2: Which leak detection method is simple, inexpensive, and shows leaks as bubbles?

Soap bubble solution
Electronic leak detector
UV dye
Nitrogen pressure test

Question 3: Which leak detection method uses a handheld sensor that reacts to refrigerant in the air?

Electronic leak detector
UV dye
Soap bubble solution
Nitrogen pressure test

Question 4: Why does nitrogen pressure testing work on Type II systems?

Because Type II systems operate below atmospheric pressure
Because nitrogen removes moisture
Because nitrogen is a refrigerant
Because Type II systems already operate above atmospheric pressure, so pressurizing further with nitrogen makes leaks easier to find

Question 5: True or False: Nitrogen pressure testing uses dry nitrogen to pressurize the system above its normal operating pressure.

False
True, but only with wet nitrogen
True
False, nitrogen is never used for leak testing

Question 6: A technician suspects a small leak at a flare fitting on a split system but cannot find it with an electronic detector. What is a low-cost next step to confirm the leak location?

Apply soap bubble solution to the fitting
Add hot water to the fitting
Lower the system pressure to zero
Switch to push-pull recovery

Question 7: Which leak detection method is NOT typically used the same way on Type III low-pressure chillers?

UV dye
Nitrogen pressure testing, the way it is done on Type II systems
Electronic leak detector
Soap bubble solution

Question 8: Which leak detection method relies on a dye that must be added to the system's oil ahead of time?

Electronic leak detector
Soap bubble solution
Nitrogen pressure test
UV dye

Question 9: What is one reason all four common Type II leak detection methods work well on this equipment?

Type II systems run below atmospheric pressure
Type II systems hold positive pressure, so refrigerant or added gas is pushed out at leak points
Type II systems never leak
Type II systems use hot water internally

Question 10: A technician wants to survey an entire rooftop unit quickly for leaks without applying anything to the surface. Which method fits best?

Soap bubble solution
Electronic leak detector
UV dye
Hot water test

Question 11: True or False: UV dye shows leaks immediately, with no need for the system to run first.

True
True, but only on chillers
False
True, but only with nitrogen

Question 12: Which leak detection method typically requires the system to be pressurized with an inert gas separate from the refrigerant?

UV dye
Electronic leak detector
Soap bubble solution
Nitrogen pressure testing

Question 13: Which of these is a Type II leak detection method that a technician can use without any special tools, other than a spray bottle?

Soap bubble solution
Electronic leak detector
UV dye and UV light
Nitrogen tank and gauges

Question 14: A technician needs to leak-test a large chiller that has been sitting in a vacuum. Why can't the technician simply spray soap bubble solution and expect the same result as on a Type II system?

The chiller is below atmospheric pressure, so there is no outward flow of gas to form bubbles at a leak point without first raising pressure
Soap bubbles do not work on metal
Soap bubbles only work on R-410A
Chillers are never checked for leaks

Question 15: Which leak detection method involves looking for bubbles forming at a joint?

Soap bubble solution
Electronic leak detector
UV dye
Nitrogen pressure test

Question 16: A technician pressurizes a Type II system with dry nitrogen to check for leaks after a repair. What should the technician do afterward, before recharging?

Leave the nitrogen in the system permanently
Vent the nitrogen and refrigerant together
Add refrigerant directly on top of the nitrogen
Recover the nitrogen and evacuate the system properly

Question 17: True or False: Electronic leak detectors can lose accuracy if the sensor tip is contaminated or worn out.

False
True
Only with UV dye present
Only on chillers

Question 18: During an inspection, a technician finds old dye stains near a fitting on a rooftop unit but no active leak signal from an electronic detector today. What does this most likely mean?

There was never a leak
The unit is a Type III chiller
There was a leak at some point that left dye residue, and it should still be checked further
The dye is fake

Question 19: Which detection method is described as pressurizing the system with dry nitrogen above normal operating pressure?

UV dye test
Soap bubble test
Nitrogen pressure test
Electronic detector test

Question 20: What do all Type II leak detection methods rely on that makes them different from the main Type III leak testing method?

They all use hot water
They all require a vacuum
They all rely on positive system pressure pushing something out through the leak
They only work on R-32 systems

Question 21: Which method might a technician choose first because it needs no special equipment beyond a spray bottle of solution?

Nitrogen pressure test
Electronic leak detector
UV dye and light
Soap bubble solution

Question 22: A technician is checking a newly brazed joint on a light commercial refrigeration line set. Which combination of methods would give the most thorough check?

UV dye alone
Hot water only
No test is needed after brazing
Nitrogen pressure test followed by an electronic leak detector or soap bubbles at the joint

Question 23: True or False: UV dye and electronic leak detectors can both be used on the same Type II system.

True
False
Only one method may be used per system
They cancel each other out

Question 24: Which statement is TRUE about leak detection on Type II equipment?

All methods require the system to be in a vacuum
All methods take advantage of the system's positive operating pressure
Only UV dye is approved by the EPA
Nitrogen pressure testing is illegal on Type II systems

Question 25: A technician is comparing leak detection on a rooftop unit versus a chiller. Which statement is most accurate?

Both use the same nitrogen pressure test in the same way
The rooftop unit can be tested directly since it holds positive pressure; the chiller needs to be raised to positive pressure first, usually with hot water
Neither can be leak tested
The chiller is tested with soap bubbles only

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 limit25 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)