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Free Practice Quiz Question List

3 Leak Detection and Repair Online Quiz Questions

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

20 questions
01
True or false
1 point

True or false: If no oil residue is visible on a refrigerant circuit, that proves the circuit is leak-free.

  1. A

    True

  2. B

    False

02
Choose one
1 point

A pressure-hold test on an isolated refrigerant circuit shows a pressure change. What can this result establish by itself?

  1. A

    It identifies the exact joint or component that is leaking.

  2. B

    It can indicate a possible leak but does not identify its position.

  3. C

    It proves that the refrigerant charge is correct.

  4. D

    It replaces the need to inspect repaired joints.

03
Written response
1 point

On what date did the separate AIM Act requirements described in the material begin for certain appliances containing HFCs or specified substitutes?

04
Fill in the blank
1 point

Before using an electronic refrigerant detector, check the detector's .

05
Choose one
1 point

An initial inspection and suitable leak-detection methods have not revealed the leak. What is the recommended next diagnostic step?

  1. A

    Increase the test pressure beyond the equipment limit until the leak becomes obvious.

  2. B

    Add stop-leak additive and assume the source has been corrected.

  3. C

    Divide the system into sections using approved isolation points and test each section in turn.

  4. D

    Replace every component in the circuit without further testing.

06
True or false
1 point

True or false: Dry nitrogen should be used for pressure testing a refrigeration system; oxygen and compressed air should not be used.

  1. A

    True

  2. B

    False

07
Choose all
1 point

When preparing to service equipment containing a flammable refrigerant, which precautions are specifically identified? Select all that apply.

  1. A

    Provide suitable ventilation.

  2. B

    Ignore ignition sources if the leak detector is operating.

  3. C

    Follow equipment-specific precautions for ignition sources.

  4. D

    Follow equipment-specific precautions for leak detection and electrical equipment.

08
Fill in the blank
1 point

During a pressure test, never exceed the manufacturer's specified test pressure or the allowable limit of the component in the section.

09
Choose one
1 point

A pressure-containing component is found to be damaged. Which repair approach best follows the guidance?

  1. A

    Apply stop-leak additive instead of locating and correcting the leak.

  2. B

    Braze every damaged component, regardless of its condition or the manufacturer's instructions.

  3. C

    Use an approved method and qualified personnel to choose between a permitted brazed repair and appropriate section or component replacement.

  4. D

    Tighten all joints as much as possible, even if that could damage the connection.

10
Choose all
1 point

Which actions are appropriate when pressure-testing a repaired refrigerant section? Select all that apply.

  1. A

    Use dry nitrogen with a suitable regulator and pressure-control equipment.

  2. B

    Raise pressure in controlled steps without exceeding the specified limit.

  3. C

    Tighten or adjust the repaired joint while it is pressurized.

  4. D

    Check repaired joints with an appropriate detector or bubble solution.

11
Open ended
1 point

After a repaired section passes its leak test, describe the remaining steps needed to return the appliance to service, verify the repair under operating conditions, and document the work.

12
Choose one
1 point

A technician confirms that a service-port core is defective. Which corrective action is appropriate?

  1. A

    Leave the core in place and rely on the system pressure test alone.

  2. B

    Replace the defective core with a compatible part and install or replace the cap as specified.

  3. C

    Use any available core, even if it is incompatible with the system.

  4. D

    Remove the cap permanently so the port can be inspected more easily.

13
Choose one
1 point

An inspection finds no oil residue on the accessible refrigerant circuit. What is the most appropriate conclusion?

  1. A

    It confirms the system is tight if no oil is visible.

  2. B

    It can be a clue, but a leak may still be present.

  3. C

    It proves that the leak is inside the compressor.

  4. D

    It means a pressure-decay test is unnecessary.

14
True or false
1 point

A pressure-hold test can show that a system may be leaking, but it does not by itself identify the leak’s location.

  1. A

    True

  2. B

    False

15
Choose one
1 point

When using an electronic refrigerant detector to check a suspected joint, which approach is most appropriate?

  1. A

    Move the probe quickly across the whole appliance so the test takes less time.

  2. B

    Hold the probe far from joints so refrigerant cannot contaminate it.

  3. C

    Move the probe slowly near likely leak points and avoid drafts that could disperse refrigerant.

  4. D

    Use any detector regardless of the refrigerant, provided the system is running.

16
Written response
1 point

Which gas should be used to pressure-test a refrigeration system after a repair?

17
Choose one
1 point

A suitable leak-detection method has not found a leak in an accessible system. What is the recommended next approach?

  1. A

    Increase test pressure beyond the equipment limit until the leak becomes obvious.

  2. B

    Divide the system at approved isolation points and test the sections in turn.

  3. C

    Add stop-leak additive and return the appliance to service.

  4. D

    Repeat the same pressure-decay test without changing the test setup.

18
Written response
1 point

After a successful leak test and removal of nitrogen as required, what two actions should be completed before charging the system?

19
Choose one
1 point

A technician must braze a leaking section of refrigerant tubing. Which preparation is appropriate before the hot work begins?

  1. A

    Recover refrigerant from the affected section, isolate it, and follow required hot-work precautions.

  2. B

    Leave refrigerant in the section and use compressed air to clear it before brazing.

  3. C

    Begin brazing once the system pressure starts falling.

  4. D

    Use oxygen as a purge gas so the joint stays clean.

20
Written response
1 point

A technician suspects a leak at an accessible joint and needs a method that can show escaping gas at that location by producing growing bubbles. What leak-detection method should the technician use?