AR SOL Solar Energy Systems Contractor
Exam Practice Questions And Correct
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Rationales 2027 Q&A | Instant
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1. What is the primary function of a photovoltaic (PV) module?
A. Store electrical energy
B. Convert sunlight into electrical energy
C. Convert AC electricity into DC electricity
D. Regulate battery temperature
Answer: B. Convert sunlight into electrical energy
Rationale: PV cells use the photovoltaic effect to convert solar radiation
directly into DC electrical energy.
2. Which component normally converts DC power from a PV array into AC
power?
,A. Combiner box
B. Charge controller
C. Inverter
D. Disconnect switch
Answer: C. Inverter
Rationale: An inverter converts the DC output of the PV array into AC
electricity suitable for loads or grid interconnection.
3. What does STC mean when referring to PV module ratings?
A. Solar Thermal Capacity
B. Standard Test Conditions
C. System Temperature Control
D. Solar Transfer Coefficient
Answer: B. Standard Test Conditions
Rationale: STC is the standard laboratory reference used for PV ratings,
commonly based on 1000 W/m² irradiance, 25°C cell temperature, and an
AM 1.5 spectrum.
,4. What happens to the voltage of identical PV modules when they are
connected in series?
A. Voltage increases
B. Voltage decreases to zero
C. Current doubles automatically
D. Power becomes zero
Answer: A. Voltage increases
Rationale: In a series-connected string, module voltages add while the
current remains approximately equal to the current of the individual
modules.
5. What happens to current when identical PV modules are connected in
parallel?
A. Voltage becomes zero
B. Current increases
C. Current decreases to half
D. Frequency increases
Answer: B. Current increases
, Rationale: Parallel-connected PV sources add their current while
maintaining approximately the same operating voltage.
6. Which condition generally causes PV module voltage to decrease?
A. Lower module temperature
B. Higher module temperature
C. Increased irradiance only
D. Reduced conductor resistance
Answer: B. Higher module temperature
Rationale: Crystalline-silicon PV modules generally have a negative voltage
temperature coefficient, so voltage decreases as cell temperature rises.
7. What is the purpose of a PV combiner box?
A. Convert DC to AC
B. Combine multiple PV string circuits
C. Store solar energy
D. Measure wind speed
Answer: B. Combine multiple PV string circuits
Exam Practice Questions And Correct
Answers (Verified Answers) Plus
Rationales 2027 Q&A | Instant
Download Pdf
1. What is the primary function of a photovoltaic (PV) module?
A. Store electrical energy
B. Convert sunlight into electrical energy
C. Convert AC electricity into DC electricity
D. Regulate battery temperature
Answer: B. Convert sunlight into electrical energy
Rationale: PV cells use the photovoltaic effect to convert solar radiation
directly into DC electrical energy.
2. Which component normally converts DC power from a PV array into AC
power?
,A. Combiner box
B. Charge controller
C. Inverter
D. Disconnect switch
Answer: C. Inverter
Rationale: An inverter converts the DC output of the PV array into AC
electricity suitable for loads or grid interconnection.
3. What does STC mean when referring to PV module ratings?
A. Solar Thermal Capacity
B. Standard Test Conditions
C. System Temperature Control
D. Solar Transfer Coefficient
Answer: B. Standard Test Conditions
Rationale: STC is the standard laboratory reference used for PV ratings,
commonly based on 1000 W/m² irradiance, 25°C cell temperature, and an
AM 1.5 spectrum.
,4. What happens to the voltage of identical PV modules when they are
connected in series?
A. Voltage increases
B. Voltage decreases to zero
C. Current doubles automatically
D. Power becomes zero
Answer: A. Voltage increases
Rationale: In a series-connected string, module voltages add while the
current remains approximately equal to the current of the individual
modules.
5. What happens to current when identical PV modules are connected in
parallel?
A. Voltage becomes zero
B. Current increases
C. Current decreases to half
D. Frequency increases
Answer: B. Current increases
, Rationale: Parallel-connected PV sources add their current while
maintaining approximately the same operating voltage.
6. Which condition generally causes PV module voltage to decrease?
A. Lower module temperature
B. Higher module temperature
C. Increased irradiance only
D. Reduced conductor resistance
Answer: B. Higher module temperature
Rationale: Crystalline-silicon PV modules generally have a negative voltage
temperature coefficient, so voltage decreases as cell temperature rises.
7. What is the purpose of a PV combiner box?
A. Convert DC to AC
B. Combine multiple PV string circuits
C. Store solar energy
D. Measure wind speed
Answer: B. Combine multiple PV string circuits
