CO Solar Photovoltaic Contractor Exam
Practice Questions And Correct
Answers (Verified Answers) Plus
Rationale 2027 Q&A| Instant
Download Pdf.
1. A Colorado contractor is planning the installation of a grid-
connected rooftop photovoltaic system on a commercial building.
Before beginning construction, which approach best reflects sound
professional practice regarding permits, plans, and code
compliance?
A. Begin installing modules immediately and submit permit documents
after the system passes an internal inspection.
B. Install only the DC portion first because photovoltaic modules are not
regulated until connected to an inverter.
C. Prepare and submit the required plans and permit documentation,
obtain approval from the authority having jurisdiction, and perform the
installation in accordance with applicable adopted codes and
manufacturer instructions.
D. Obtain approval only from the utility because utility permission
automatically replaces local permitting requirements.
,Rationale: Photovoltaic installations generally require compliance with
locally adopted building, electrical, fire, and other applicable
requirements, and work should proceed under required permits and
approvals from the authority having jurisdiction.
2. What is the primary purpose of a photovoltaic module's nameplate
electrical ratings, including open-circuit voltage, short-circuit
current, maximum power voltage, and maximum power current?
A. To determine the physical dimensions of the roof attachment system
only.
B. To provide essential electrical characteristics used in system design,
conductor sizing, overcurrent protection, inverter compatibility, and
equipment evaluation.
C. To establish the utility's monthly billing rate for exported energy.
D. To determine the manufacturer's recommended cleaning schedule.
Rationale: Module nameplate ratings provide fundamental electrical
information needed to design a safe and compatible PV system and
must be considered together with applicable code requirements and
environmental correction factors.
3. A PV contractor is evaluating several possible roof areas for a solar
array. Which condition is generally most important when estimating
the long-term energy production of each location?
A. The color of the roofing membrane.
B. The distance between the building entrance and the inverter.
C. The amount of solar irradiance available throughout the year after
,considering orientation, tilt, shading, and local environmental
conditions.
D. Whether the roof is visible from a public roadway.
Rationale: Energy production depends heavily on solar resource
availability and losses caused by shading, orientation, tilt, temperature,
soiling, and other site-specific conditions.
4. Why can partial shading of a photovoltaic array significantly reduce
system output even when only a small portion of the array is
shaded?
A. Shading permanently increases the voltage rating of unaffected
modules.
B. Because cells and modules connected electrically may experience
reduced current production, mismatch losses, and activation of bypass
diodes depending on the system configuration.
C. Because sunlight reflected from shaded modules damages the inverter.
D. Because shaded modules automatically disconnect all AC circuits in the
building.
Rationale: Partial shading can reduce current and cause electrical
mismatch within modules or strings, resulting in disproportionate
production losses depending on module and system architecture.
5. A contractor is selecting an inverter for a grid-connected PV system.
Which factor is most critical to confirm before installation?
, A. The inverter enclosure color matches the module frame finish.
B. The inverter is listed and suitable for the intended application and is
electrically compatible with the PV array, utility interconnection
requirements, and the installation environment.
C. The inverter weighs less than the heaviest PV module.
D. The inverter has a display screen larger than the service disconnect.
Rationale: Inverters must be appropriate for the electrical characteristics
and intended environment of the PV system and must satisfy applicable
listing, installation, and interconnection requirements.
6. What is the principal function of a maximum power point tracking
system within many modern photovoltaic inverters?
A. To physically rotate modules toward the sun throughout the day.
B. To increase utility voltage whenever solar production declines.
C. To operate the PV array at an electrical voltage and current
combination that maximizes available power under changing conditions.
D. To eliminate the need for overcurrent protection on DC conductors.
Rationale: Maximum power point tracking continuously adjusts the
operating point of the PV source so that available power can be
harvested efficiently as irradiance and temperature change.
7. A series-connected PV string contains identical modules. Compared
with a single module, what generally happens to the string voltage
and current under uniform operating conditions?
Practice Questions And Correct
Answers (Verified Answers) Plus
Rationale 2027 Q&A| Instant
Download Pdf.
1. A Colorado contractor is planning the installation of a grid-
connected rooftop photovoltaic system on a commercial building.
Before beginning construction, which approach best reflects sound
professional practice regarding permits, plans, and code
compliance?
A. Begin installing modules immediately and submit permit documents
after the system passes an internal inspection.
B. Install only the DC portion first because photovoltaic modules are not
regulated until connected to an inverter.
C. Prepare and submit the required plans and permit documentation,
obtain approval from the authority having jurisdiction, and perform the
installation in accordance with applicable adopted codes and
manufacturer instructions.
D. Obtain approval only from the utility because utility permission
automatically replaces local permitting requirements.
,Rationale: Photovoltaic installations generally require compliance with
locally adopted building, electrical, fire, and other applicable
requirements, and work should proceed under required permits and
approvals from the authority having jurisdiction.
2. What is the primary purpose of a photovoltaic module's nameplate
electrical ratings, including open-circuit voltage, short-circuit
current, maximum power voltage, and maximum power current?
A. To determine the physical dimensions of the roof attachment system
only.
B. To provide essential electrical characteristics used in system design,
conductor sizing, overcurrent protection, inverter compatibility, and
equipment evaluation.
C. To establish the utility's monthly billing rate for exported energy.
D. To determine the manufacturer's recommended cleaning schedule.
Rationale: Module nameplate ratings provide fundamental electrical
information needed to design a safe and compatible PV system and
must be considered together with applicable code requirements and
environmental correction factors.
3. A PV contractor is evaluating several possible roof areas for a solar
array. Which condition is generally most important when estimating
the long-term energy production of each location?
A. The color of the roofing membrane.
B. The distance between the building entrance and the inverter.
C. The amount of solar irradiance available throughout the year after
,considering orientation, tilt, shading, and local environmental
conditions.
D. Whether the roof is visible from a public roadway.
Rationale: Energy production depends heavily on solar resource
availability and losses caused by shading, orientation, tilt, temperature,
soiling, and other site-specific conditions.
4. Why can partial shading of a photovoltaic array significantly reduce
system output even when only a small portion of the array is
shaded?
A. Shading permanently increases the voltage rating of unaffected
modules.
B. Because cells and modules connected electrically may experience
reduced current production, mismatch losses, and activation of bypass
diodes depending on the system configuration.
C. Because sunlight reflected from shaded modules damages the inverter.
D. Because shaded modules automatically disconnect all AC circuits in the
building.
Rationale: Partial shading can reduce current and cause electrical
mismatch within modules or strings, resulting in disproportionate
production losses depending on module and system architecture.
5. A contractor is selecting an inverter for a grid-connected PV system.
Which factor is most critical to confirm before installation?
, A. The inverter enclosure color matches the module frame finish.
B. The inverter is listed and suitable for the intended application and is
electrically compatible with the PV array, utility interconnection
requirements, and the installation environment.
C. The inverter weighs less than the heaviest PV module.
D. The inverter has a display screen larger than the service disconnect.
Rationale: Inverters must be appropriate for the electrical characteristics
and intended environment of the PV system and must satisfy applicable
listing, installation, and interconnection requirements.
6. What is the principal function of a maximum power point tracking
system within many modern photovoltaic inverters?
A. To physically rotate modules toward the sun throughout the day.
B. To increase utility voltage whenever solar production declines.
C. To operate the PV array at an electrical voltage and current
combination that maximizes available power under changing conditions.
D. To eliminate the need for overcurrent protection on DC conductors.
Rationale: Maximum power point tracking continuously adjusts the
operating point of the PV source so that available power can be
harvested efficiently as irradiance and temperature change.
7. A series-connected PV string contains identical modules. Compared
with a single module, what generally happens to the string voltage
and current under uniform operating conditions?
