NABCEP PV Associate Solar Photovoltaic
Exam Questions and Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf.
1. What is the primary purpose of a photovoltaic (PV) module?
A. Convert heat into electricity
B. Store electrical energy
C. Convert sunlight directly into electricity
D. Increase utility grid voltage
Rationale: A photovoltaic module converts solar radiation into direct
current (DC) electricity through the photovoltaic effect. Semiconductor
materials, typically silicon, release electrons when exposed to sunlight,
generating electrical current. PV modules do not store energy or convert
heat into electricity.
2. Which semiconductor material is most commonly used in
photovoltaic solar panels?
A. Copper
B. Aluminum
C. Silicon
D. Graphite
,Rationale: Silicon is the dominant semiconductor material used in
modern photovoltaic modules because of its abundance, efficiency,
durability, and well-established manufacturing processes.
Monocrystalline and polycrystalline silicon account for the majority of
commercial PV modules.
3. Which type of current is produced directly by a photovoltaic
module?
A. Alternating Current (AC)
B. Direct Current (DC)
C. Pulsed Current
D. Three-phase Current
Rationale: PV modules naturally generate direct current (DC). Before
electricity can be supplied to most homes or exported to the electrical
grid, an inverter converts DC electricity into alternating current (AC).
4. Which device converts DC electricity from a PV array into AC
electricity suitable for household use?
A. Transformer
B. Charge controller
C. Inverter
D. Disconnect switch
Rationale: An inverter is responsible for converting DC electricity
generated by solar panels into AC electricity compatible with household
,appliances and utility grids. This is one of the most critical components
of a grid-connected PV system.
5. Which factor has the greatest impact on a solar panel's energy
production?
A. Wind speed
B. Solar irradiance
C. Soil moisture
D. Humidity
Rationale: Solar irradiance, or the amount of sunlight striking the
module surface, has the greatest influence on energy production. Higher
irradiance results in greater electrical output, assuming temperature
and other operating conditions remain constant.
6. What is the standard test condition (STC) irradiance used to rate
PV modules?
A. 500 W/m²
B. 750 W/m²
C. 1000 W/m²
D. 1500 W/m²
Rationale: Standard Test Conditions (STC) specify an irradiance of 1000
watts per square meter, a cell temperature of 25°C, and an air mass of
1.5. Manufacturers use these standardized conditions to rate module
performance.
, 7. Which environmental condition generally decreases PV module
efficiency?
A. Cooler temperatures
B. Higher module temperatures
C. Increased sunlight
D. Proper ventilation
Rationale: As PV cell temperature increases, module voltage decreases,
reducing overall efficiency. Cooler operating temperatures generally
improve photovoltaic performance and system output.
8. What is the unit commonly used to measure solar irradiance?
A. Volts
B. Amperes
C. Ohms
D. Watts per square meter (W/m²)
Rationale: Solar irradiance is measured in watts per square meter
(W/m²), representing the amount of solar power received over a given
surface area.
9. Which orientation generally provides the greatest annual energy
production for a fixed PV system in the Northern Hemisphere?
A. North
B. East
C. South
D. West
Exam Questions and Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf.
1. What is the primary purpose of a photovoltaic (PV) module?
A. Convert heat into electricity
B. Store electrical energy
C. Convert sunlight directly into electricity
D. Increase utility grid voltage
Rationale: A photovoltaic module converts solar radiation into direct
current (DC) electricity through the photovoltaic effect. Semiconductor
materials, typically silicon, release electrons when exposed to sunlight,
generating electrical current. PV modules do not store energy or convert
heat into electricity.
2. Which semiconductor material is most commonly used in
photovoltaic solar panels?
A. Copper
B. Aluminum
C. Silicon
D. Graphite
,Rationale: Silicon is the dominant semiconductor material used in
modern photovoltaic modules because of its abundance, efficiency,
durability, and well-established manufacturing processes.
Monocrystalline and polycrystalline silicon account for the majority of
commercial PV modules.
3. Which type of current is produced directly by a photovoltaic
module?
A. Alternating Current (AC)
B. Direct Current (DC)
C. Pulsed Current
D. Three-phase Current
Rationale: PV modules naturally generate direct current (DC). Before
electricity can be supplied to most homes or exported to the electrical
grid, an inverter converts DC electricity into alternating current (AC).
4. Which device converts DC electricity from a PV array into AC
electricity suitable for household use?
A. Transformer
B. Charge controller
C. Inverter
D. Disconnect switch
Rationale: An inverter is responsible for converting DC electricity
generated by solar panels into AC electricity compatible with household
,appliances and utility grids. This is one of the most critical components
of a grid-connected PV system.
5. Which factor has the greatest impact on a solar panel's energy
production?
A. Wind speed
B. Solar irradiance
C. Soil moisture
D. Humidity
Rationale: Solar irradiance, or the amount of sunlight striking the
module surface, has the greatest influence on energy production. Higher
irradiance results in greater electrical output, assuming temperature
and other operating conditions remain constant.
6. What is the standard test condition (STC) irradiance used to rate
PV modules?
A. 500 W/m²
B. 750 W/m²
C. 1000 W/m²
D. 1500 W/m²
Rationale: Standard Test Conditions (STC) specify an irradiance of 1000
watts per square meter, a cell temperature of 25°C, and an air mass of
1.5. Manufacturers use these standardized conditions to rate module
performance.
, 7. Which environmental condition generally decreases PV module
efficiency?
A. Cooler temperatures
B. Higher module temperatures
C. Increased sunlight
D. Proper ventilation
Rationale: As PV cell temperature increases, module voltage decreases,
reducing overall efficiency. Cooler operating temperatures generally
improve photovoltaic performance and system output.
8. What is the unit commonly used to measure solar irradiance?
A. Volts
B. Amperes
C. Ohms
D. Watts per square meter (W/m²)
Rationale: Solar irradiance is measured in watts per square meter
(W/m²), representing the amount of solar power received over a given
surface area.
9. Which orientation generally provides the greatest annual energy
production for a fixed PV system in the Northern Hemisphere?
A. North
B. East
C. South
D. West
