Free NABCEP PV Commissioning & Maintenance Specialist (PVCMS) Certification Examination Practice Questions

Sample Practice Questions

Try these 10 sample questions from the NABCEP PV Commissioning & Maintenance Specialist (PVCMS) Certification Examination practice bank. Each includes the answer and explanation. Continue with the interactive practice above to review the full question set.

1. 1When should a project establish its PV commissioning plan and budget?

   1. A. Before project construction begins
   2. B. When the system first produces power
   3. C. After the first year of operation
   4. D. After the initial performance report

   Answer: A

   Explanation: The DOE guidance states, "A commissioning plan and budget should be in place ahead of project construction." Planning at the outset allows the protocol and resources to be set before field work.

   Reference: Life Cycle of Photovoltaic Systems: Install and Commission a Photovoltaic System — Commissioning Best Practices

2. 2During a visual inspection, exposed module-to-combiner wires need special attention for physical damage. Why?

   1. A. They are protected by their open-air location.
   2. B. Their faults are harder to locate than buried faults.
   3. C. They are exposed to more physical damage.
   4. D. They require excavation before damage can be seen.

   Answer: C

   Explanation: NREL states, "These are most subject to damage" That exposure makes physical condition a specific inspection concern.

   Reference: Best Practices for Operation and Maintenance of Photovoltaic and Energy Storage Systems; 3rd Edition — PDF p. 11, §5.1 Electrical System

3. 3For the designated structural connections on a newly commissioned PV array, what should the agent of record verify?

   1. A. Verify only the connection labels against drawings.
   2. B. Verify correct installation of designated structural connections.
   3. C. Verify only the shipping condition of spare fasteners.
   4. D. Verify only the torque wrench's calibration label.

   Answer: B

   Explanation: The source states, "verify the correct installation of all—or a significant subset of—designated structural connections" This is a mechanical installation check of the connections.

   Reference: Operational and Economic Impacts of Extreme Weather on PV Power Plants — PDF p. 18, construction and commissioning

4. 4A combiner fuse has been removed for a continuity check. What measurement is the target across an intact fuse?

   1. A. Infinite resistance
   2. B. Zero ohms
   3. C. Rated DC voltage
   4. D. Rated short-circuit current

   Answer: B

   Explanation: DOE's PV circuit test guidance states, "Ohm-meter - seek zero ohms across removed fuse" A sound fuse gives a low-resistance path.

   Reference: Step 5: Project Operations and Maintenance — PDF slide, Different Tests of PV Circuits

5. 5At initial PV system startup, which procedure should guide the inverter startup sequence?

   1. A. The manufacturer’s instructions
   2. B. The prior owner’s billing record
   3. C. The annual cleaning schedule
   4. D. The expected warranty expiration date

   Answer: A

   Explanation: The source states, "Inverter startup sequence – follow manufacturer’s instructions for initial startup" PDF p. 5, Post Inspection - Performance Testing

   Reference: SERC Solar PV System Field-Inspection Checklist — The equipment-specific procedure controls initial operation.

6. 6At PV project closeout, which record documents the completed commissioning tests and their results?

   1. A. An as-built single-line diagram
   2. B. A commissioning report
   3. C. A signed construction permit
   4. D. An equipment warranty sheet

   Answer: B

   Explanation: The source states, "Finalized documentation (e.g., commission report," This is the closeout record for commissioning evidence.

   Reference: NABCEP PV Specialist JTA — PDF p. 12, PVCMS Task 6

7. 7At owner orientation, which procedure should be demonstrated for normal operation and planned shutdown?

   1. A. The safe startup, operation, and shutdown sequence
   2. B. Only the annual preventive-maintenance schedule
   3. C. Only the inverter performance-ratio calculation
   4. D. Only the emergency contact escalation chart

   Answer: A

   Explanation: The source states, "Safe startup, operation, and shutdown procedures" PDF p. 12, PVCMS Task 7

   Reference: NABCEP PV Specialist JTA — Those are explicit owner-orientation knowledge items.

8. 8A PV monitoring report needs to compare actual production with expected production under the measured resource and temperature. Which indicator fits?

   1. A. Equipment availability
   2. B. Performance ratio
   3. C. Capacity factor from nameplate alone
   4. D. Instantaneous AC voltage

   Answer: B

   Explanation: The source states, "Performance ratio = actual production/model production (%)" Measuring Your System's Solar Photovoltaic Performance

   Reference: Optimizing Solar Photovoltaic Performance for Longevity — The ratio uses measured production and modelled output.

9. 9Two PV sites differ in array size, mounting design, and local dust exposure. How should their preventive-maintenance protocols be set?

   1. A. Use the same fixed checklist at every site.
   2. B. Set protocols by size, design, complexity, and environment.
   3. C. Schedule only after a component fails.
   4. D. Use only the OEM warranty expiration date.

   Answer: B

   Explanation: The source states, "Preventive maintenance protocols depend on system size, design, complexity, and environment." PDF p. 53, §6.6 Preventive/Scheduled Maintenance

   Reference: Best Practices for Operation and Maintenance of Photovoltaic and Energy Storage Systems; 3rd Edition — The schedule should reflect the actual system and site.

10. 10A storm-damaged PV system has exposed conductors and loose modules. What is the first corrective-maintenance priority?

    1. A. Resume energy delivery while repairs are planned.
    2. B. Document the damage before restricting access.
    3. C. Render the site physically and electrically safe.
    4. D. Test damaged live circuits before isolation.

    Answer: C

    Explanation: The source states, "The priority following a damage event is to render the system physically and electrically safe pending inspection, testing, and repairs." Execute a Post-Damage Recovery Plan, How To Render a System Safe

    Reference: Life Cycle of Photovoltaic Systems: Operate and Maintain an Existing Photovoltaic System — Safety precedes diagnosis and repair.