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Free Practice Quiz Question List

2 Service Preparation and System Isolation Online Quiz Questions

Use this free practice quiz with 20 questions to review 2 Service Preparation and System Isolation, test your knowledge, and prepare for your next test or exam.

20 questions
01
True or false
1 point

An orderly shutdown by itself proves that all hazardous energy has been eliminated. True or false?

  1. A

    True

  2. B

    False

02
Choose one
1 point

A technician needs to isolate an appliance's electrical supply before servicing it. Which action follows the material's electrical-isolation guidance?

  1. A

    Use the equipment's control switch and begin work once the display goes dark.

  2. B

    Use the designated disconnect or another energy-isolating device, then follow the energy-control procedure.

  3. C

    Close the service valve and rely on it to isolate both electrical and refrigerant energy.

  4. D

    Ask an affected worker to confirm that the appliance appears to be off.

03
Choose one
1 point

A technician is staging equipment for a high-pressure refrigeration service job. Which selection best meets the material's tool and recovery-equipment requirements?

  1. A

    Choose tools based on whether they fit the connections; pressure rating is not relevant if the appliance is shut down.

  2. B

    Use any recovery cylinder if it is empty and has enough capacity.

  3. C

    Use compatible, serviceable equipment rated for the pressures involved, and confirm recovery equipment and cylinders suit the refrigerant and intended use.

  4. D

    Use tools rated for the pressure but disregard refrigerant compatibility.

04
True or false
1 point

A closed service valve alone proves that the downstream section is safe to open. True or false?

  1. A

    True

  2. B

    False

05
Written response
1 point

In the relevant service circumstances, EPA specifies evacuation to what gauge pressure before opening a high- or very-high-pressure appliance?

06
Fill in the blank
1 point

In the United States, technicians performing covered refrigerant work are subject to requirements.

07
Written response
1 point

After identifying energy sources, what must a technician apply personally, as required by the employer's energy-control procedure?

08
Choose all
1 point

When assessing a refrigeration service job, which factors should be considered as potential hazards? Select all that apply.

  1. A

    Electrical energy

  2. B

    Pressure

  3. C

    Hot or cold surfaces

  4. D

    Refrigerant exposure

  5. E

    Restricted ventilation

  6. F

    Ignition hazards when refrigerant properties or site conditions make them relevant

  7. G

    The color of the appliance's exterior

  8. H

    The number of labels on the work-area boundary

09
Fill in the blank
1 point

If leakage prevents the required evacuation, follow EPA's applicable and the employer's safe-work procedure.

10
Choose one
1 point

A technician is preparing a work area. When does the material call for keeping ignition sources away?

  1. A

    Keep ignition sources away from every refrigeration job, regardless of refrigerant properties or instructions.

  2. B

    Keep ignition sources away when the refrigerant's properties or the applicable instructions require it.

  3. C

    Keep ignition sources away only after the refrigerant circuit has been opened.

  4. D

    Ignore ignition sources if the work area has been cleared of trip hazards.

11
Choose all
1 point

Testing requires temporary re-energization during service. Which actions are part of the required sequence? Select all that apply.

  1. A

    Clear people and tools before temporary re-energization.

  2. B

    Follow the prescribed testing sequence.

  3. C

    Leave the appliance energized after testing so the technician can continue service.

  4. D

    De-energize and reapply isolation before resuming service.

12
Choose one
1 point

During preparation, a technician cannot identify the refrigerant or determine whether the hazards can be controlled. What should the technician do?

  1. A

    Continue with extra caution because a low-pressure reading will resolve any unknown hazard.

  2. B

    Open the appliance briefly to identify the refrigerant from its smell.

  3. C

    Stop and get qualified assistance.

  4. D

    Rely on the appliance's control switch and proceed with the planned work.

13
Written response
1 point

Where should a technician look, where possible, to identify the appliance's valves and other isolation points?

14
Open ended
1 point

A technician is assigned to open a section of a high-pressure refrigeration circuit. Describe a safe preparation and isolation plan, including the applicable evacuation target, what that target does and does not establish, how to verify conditions at the section before opening, and how to maintain isolation during the work.

15
Choose one
1 point

A technician is staging equipment for service on a refrigeration circuit. Which approach best reduces equipment-related hazards?

  1. A

    Use any available equipment if the appliance is shut down.

  2. B

    Use equipment compatible with the refrigerant and rated for the pressures involved, after checking it for damage.

  3. C

    Use equipment rated for the average operating pressure, even if it is not compatible with the refrigerant.

  4. D

    Use damaged equipment if its fittings appear to connect securely.

16
Choose one
1 point

When preparing a work area for refrigeration service, which plan best reflects the required precautions?

  1. A

    Keep the work area closed to all ventilation so refrigerant cannot escape.

  2. B

    Allow access to the work zone and leave ignition sources in place unless a hazard has already occurred.

  3. C

    Keep the work zone clear and accessible, provide suitable ventilation, and control ignition sources when required.

  4. D

    Stage tools in walkways so they remain close to the appliance.

17
Choose one
1 point

A technician cannot identify the refrigerant or determine how to control a suspected hazard. What should the technician do?

  1. A

    Proceed with ordinary precautions because the appliance is shut down.

  2. B

    Stop and get qualified assistance until the refrigerant and hazards can be identified or controlled.

  3. C

    Open the circuit briefly to identify the refrigerant from its smell.

  4. D

    Continue if the work area has been cleared, even if the refrigerant is unknown.

18
True or false
1 point

A service valve is closed, so the section downstream of it can be assumed safe to open.

  1. A

    True

  2. B

    False

19
Choose one
1 point

A technician must electrically isolate an appliance before service. Which action is appropriate?

  1. A

    Turn the appliance's control switch off and begin work.

  2. B

    Ask another worker to watch the controls while service is underway.

  3. C

    Use the designated disconnect or another energy-isolating device, following the energy-control procedure.

  4. D

    Close a refrigerant service valve and treat that as electrical isolation.

20
Written response
1 point

In the applicable service circumstances, what gauge-pressure reading does EPA specify as the evacuation target before opening a high- or very-high-pressure appliance? Enter the value in psig.