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Free Practice Quiz Question List

5 Chiller Service Practice and Verification Online Quiz Questions

Use this free practice quiz with 20 questions to review 5 Chiller Service Practice and Verification, test your knowledge, and prepare for your next test or exam.

20 questions
01
True or false
1 point

True or false: A chiller’s control circuits alone are energy-isolating devices, so they are sufficient for lockout/tagout before servicing.

  1. A

    True

  2. B

    False

02
True or false
1 point

True or false: The 25 mm Hg absolute recovery level listed for low-pressure appliances is a universal target for every chiller.

  1. A

    True

  2. B

    False

03
Choose one
1 point

Which statement correctly distinguishes refrigerant recovery from dehydration evacuation?

  1. A

    Recovery removes air and moisture before charging; dehydration transfers refrigerant into a cylinder.

  2. B

    Recovery removes refrigerant into approved equipment; dehydration removes air and moisture from a repaired circuit before charging.

  3. C

    Recovery and dehydration are two names for reaching the same vacuum target.

  4. D

    Recovery checks for leaks; dehydration is the process of isolating electrical energy.

04
Choose one
1 point

Two instruments give conflicting pressure readings during service. Which response best supports a valid comparison?

  1. A

    Choose whichever gauge reads lower and use that value.

  2. B

    Check instrument range, calibration status, connection location, and whether each reading is gauge or absolute pressure; record the units.

  3. C

    Convert both readings to a dehydration target, regardless of the job.

  4. D

    Ignore the units if both instruments are connected to the same chiller.

05
Choose one
1 point

After service and reassembly, what should happen before energy is restored to the chiller?

  1. A

    Restore energy as soon as the circuit is reassembled, even if tools remain nearby.

  2. B

    Verify personnel and tools are clear, then restore energy and follow the manufacturer’s charging and startup procedure.

  3. C

    Restore energy before reassembly so the technician can check the open circuit.

  4. D

    Restore energy only after refrigerant has been vented from the system.

06
Choose one
1 point

When following the prescribed recovery sequence, which approach is correct for refrigerant in both liquid and vapor form?

  1. A

    Recover vapor only because liquid recovery is not permitted.

  2. B

    Recover liquid first when following the prescribed sequence, then also recover vapor.

  3. C

    Recover liquid first, then vent the remaining vapor.

  4. D

    Recover either liquid or vapor, but not both.

07
Fill in the blank
1 point

During low-pressure chiller recovery, protect the water side by as required by the equipment procedure.

08
Fill in the blank
1 point

For a pressure-rebound check, document the initial reading, .

09
Written response
1 point

What recovery level does EPA’s table give for low-pressure appliances? Enter the numeric value only; the unit suffix is supplied.

10
Written response
1 point

For certain appliances containing ozone-depleting refrigerant, what charge threshold is associated with EPA documentation requirements for leak inspections and verification tests? Enter the numeric threshold only; the unit suffix is supplied.

11
Choose all
1 point

Before recovery begins, which checks belong in the recovery-setup inspection? Select all correct choices.

  1. A

    Confirm the recovery unit is suitable for the refrigerant and appliance.

  2. B

    Use an approved cylinder compatible with the refrigerant.

  3. C

    Check that hoses and fittings are in good condition.

  4. D

    Monitor cylinder capacity and weight as directed by the cylinder manufacturer.

  5. E

    Mix refrigerants in the cylinder to simplify later handling.

  6. F

    Exceed equipment ratings if recovery is slow.

12
Choose all
1 point

A leaking section cannot reach the normal specified evacuation level. Under the limited exception described for leaking equipment, which actions are appropriate? Select all correct choices.

  1. A

    Isolate leaking components from non-leaking components where possible.

  2. B

    Evacuate non-leaking components to the specified level.

  3. C

    Evacuate leaking components to the lowest attainable level without substantially contaminating recovered refrigerant, not exceeding 0 psig.

  4. D

    Assume every leaking component qualifies for the exception without checking the applicable procedure.

  5. E

    Stop documenting readings because the normal target was not reached.

13
Open ended
1 point

A technician is completing a chiller recovery. Explain how the refrigerant must be handled and what equipment should be used.

14
Written response
1 point

When the prescribed recovery sequence recovers liquid refrigerant first, what phase must still be recovered afterward?

15
Written response
1 point

Under the limited exception for leaking equipment, what is the maximum pressure to which leaking components may be evacuated? Enter the value in psig.

16
True or false
1 point

True or false: Refrigerant may be vented during recovery instead of being collected using the prescribed recovery equipment.

  1. A

    True

  2. B

    False

17
Choose one
1 point

A technician is preparing to recover refrigerant from a low-pressure chiller. Which action best protects the water side?

  1. A

    Drain the water side in every case, regardless of the equipment procedure.

  2. B

    Circulate or remove water as the equipment procedure requires to prevent freezing.

  3. C

    Leave the water side unchanged because refrigerant recovery cannot affect it.

  4. D

    Disconnect water-side protection once recovery begins.

18
Choose one
1 point

A technician finds that a recovery setup was last used with a different refrigerant. Which preparation best helps prevent cross-contamination and ensures a suitable setup?

  1. A

    Use any available recovery unit, then identify the refrigerant after recovery.

  2. B

    Combine refrigerants in one cylinder if the cylinder has enough capacity.

  3. C

    Confirm the unit and approved cylinder are compatible with the refrigerant, and keep refrigerants separated.

  4. D

    Choose the cylinder by appearance and estimate its capacity from the hose length.

19
Choose one
1 point

A chiller reaches its specified recovery endpoint, but pressure rises after the required wait. What should the technician do next?

  1. A

    Open the circuit because the gauge reached the target once.

  2. B

    Check the setup and isolation valves, consider refrigerant remaining in the system or oil, and resume the prescribed recovery and verification process.

  3. C

    Assume the rise is harmless and document only the initial reading.

  4. D

    Switch to dehydration evacuation and treat that as a substitute for the recovery check.

20
Choose one
1 point

After a chiller repair, the system reaches its specified dehydration target, but pressure rises during the standing test. Which response is appropriate?

  1. A

    Investigate possible leaks, trapped refrigerant or moisture, valve leakage, and instrument or hose problems; correct the cause and repeat evacuation and verification.

  2. B

    Declare the circuit dry and tight because it reached the target initially.

  3. C

    Continue charging because a standing test is only relevant before recovery.

  4. D

    Use the regulatory recovery endpoint as proof that the dehydration target has been met.