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Free Practice Quiz Question List

3 Leak Detection, Repair, and Verification Online Quiz Questions

Use this free practice quiz with 20 questions to review 3 Leak Detection, Repair, and Verification, test your knowledge, and prepare for your next test or exam.

20 questions
01
Choose one
1 point

When pressure-testing a refrigerant system with dry nitrogen, which procedure is appropriate?

  1. A

    Use oxygen at a pressure below the system’s operating pressure.

  2. B

    Use regulated dry nitrogen and do not exceed the lowest applicable rating.

  3. C

    Use compressed air if the refrigerant has been recovered.

  4. D

    Use nitrogen without a regulator if the test is brief.

02
Choose one
1 point

A technician finds damage at a refrigerant line. Which repair goal best meets the material’s guidance?

  1. A

    Cover the suspected leak so refrigerant cannot escape visibly.

  2. B

    Add refrigerant and monitor the system for a short period.

  3. C

    Repair or replace the damaged part so the pressure boundary is restored.

  4. D

    Tighten every fitting, whether or not it is related to the leak.

03
Choose one
1 point

Under the limited EPA exception described for certain non-major repairs on high- or very-high-pressure appliances that are not followed by evacuation to the environment, what condition must be met before opening the appliance?

  1. A

    For the specified limited exception, the appliance must be at 0 psig before opening.

  2. B

    The appliance may be opened at any pressure if the repair is non-major.

  3. C

    The exception applies to every repair on a high-pressure appliance.

  4. D

    The exception permits venting refrigerant to reduce pressure before opening.

04
Choose one
1 point

When should initial verification confirm that the repaired location is leak-free?

  1. A

    After the appliance has completed its follow-up verification.

  2. B

    Only after the system has been recharged and operating for several days.

  3. C

    After the full appliance has passed a system-level pressure check.

  4. D

    After repair and before adding refrigerant back to the appliance or repaired section.

05
Choose all
1 point

Which methods can help identify the location of a refrigerant leak? Select all that apply.

  1. A

    Apply an approved bubble solution to likely leak points and look for growing bubbles.

  2. B

    Move an electronic refrigerant detector’s probe slowly around joints and suspect areas.

  3. C

    Use a pressure-decay test by itself to identify the leak’s location.

  4. D

    Use ultrasonic or gas-imaging equipment where appropriate.

06
Choose all
1 point

Which details belong in the service record for leak detection and repair? Select all that apply.

  1. A

    Leak location

  2. B

    Technician’s preferred future service schedule

  3. C

    Detection method

  4. D

    Repair performed

  5. E

    Test conditions and results

  6. F

    A guarantee that no future leak can occur

07
True or false
1 point

Oil or residue on a system component can indicate a leak, but that finding alone does not confirm that a leak is present.

  1. A

    True

  2. B

    False

08
True or false
1 point

If a system-level pressure test supports integrity, a close inspection of the repaired site is unnecessary.

  1. A

    True

  2. B

    False

09
Written response
1 point

As of 2026, when the applicable leak-rate threshold is exceeded, what is the minimum refrigerant charge for an appliance to fall under the described Section 608 leak-repair requirements for ozone-depleting refrigerant? Enter the value in pounds.

10
Written response
1 point

On what date did the separate EPA leak-repair rule for certain appliances with HFC refrigerant or qualifying substitutes become effective?

11
Written response
1 point

If a leak prevents the required evacuation, what should a technician do with leaking components where possible?

12
Open ended
1 point

A service company is deciding which leak-repair requirements apply to an appliance and who must handle compliance. Explain which appliance and refrigerant facts must be considered, why pressure classification alone is insufficient, and how the material distinguishes owners’ and operators’ duties from technicians’ duties.

13
True or false
1 point

True or false: Oil or residue on a refrigerant system, by itself, confirms the leak’s location.

  1. A

    True

  2. B

    False

14
Written response
1 point

For the separate EPA leak-repair rule, what is the minimum refrigerant charge, in pounds, for certain appliances with HFC refrigerant or qualifying substitutes to be covered?

15
Choose one
1 point

After a repaired section passes its pressure test, what must be done before adding refrigerant, and what follows that check?

  1. A

    Use a suitable locating method to confirm the repaired location is leak-free before adding refrigerant; then evacuate and recharge according to the manufacturer’s specifications.

  2. B

    Add refrigerant immediately because passing a system-level pressure test proves the repaired location is leak-free.

  3. C

    Vent the remaining refrigerant, then recharge without checking the repaired location.

  4. D

    Skip evacuation and recharge the system before verifying the repair.

16
Choose one
1 point

A system loses pressure during a pressure-decay test, but the leak site is unknown. What should the technician do next?

  1. A

    Use the pressure-decay result alone to identify the leak’s exact location.

  2. B

    Treat the pressure loss as proof that the compressor has failed.

  3. C

    Use the result as evidence of pressure loss, then apply a method that locates the leak.

  4. D

    Recharge the system before using any leak-detection method.

17
Choose one
1 point

A technician needs to pressure-test a refrigerant system. Which procedure uses the appropriate test gas and equipment?

  1. A

    Use compressed air with a regulator because it is easy to obtain.

  2. B

    Use dry nitrogen with a regulator and suitable test equipment.

  3. C

    Use oxygen at low pressure to avoid damaging the system.

  4. D

    Use any available gas if the system is isolated.

18
Choose one
1 point

A repaired section contains components with different rated test pressures. What determines the maximum test pressure?

  1. A

    The rating of the strongest component in the system.

  2. B

    The appliance rating, regardless of component ratings.

  3. C

    The lowest applicable rating of the appliance and components.

  4. D

    A standard pressure chosen without checking equipment ratings.

19
Fill in the blank
1 point

A repaired appliance has passed its initial leak check and has been recharged. Complete the follow-up step: recheck the repaired site after the appliance returns to , unless professional judgment indicates an earlier test would be more meaningful.

20
Fill in the blank
1 point

A technician is preparing to open a refrigerant system for repair. Complete the required step: refrigerant must be as required, and applicable evacuation requirements must be followed.