California Solar Contractor Examination (C-46)
Questions With Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A | Instant
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1. What is the primary function of a photovoltaic (PV) system?
A. Convert sunlight into heat
B. Convert sunlight into electricity
C. Store wind energy
D. Convert electricity into light
Answer: B. Convert sunlight into electricity
Rationale: Photovoltaic systems use semiconductor materials
(typically silicon cells) to directly convert solar radiation into electrical
energy through the photovoltaic effect.
2. Which component converts DC electricity into AC electricity in a
solar system?
A. Charge controller
B. Combiner box
, C. Inverter
D. PV module
Answer: C. Inverter
Rationale: The inverter changes direct current (DC) produced by solar
panels into alternating current (AC), which is used by most household
and commercial appliances.
3. What is the purpose of a charge controller in a PV system?
A. Increase voltage output
B. Prevent battery overcharging
C. Convert AC to DC
D. Store electrical energy
Answer: B. Prevent battery overcharging
Rationale: A charge controller regulates voltage and current going
into batteries, protecting them from overcharging and extending their
lifespan.
4. Which factor most directly affects solar panel output?
A. Panel color
B. Ambient noise
, C. Sunlight intensity
D. Wire insulation type
Answer: C. Sunlight intensity
Rationale: The amount of irradiance (sunlight intensity) directly
impacts the electrical output of photovoltaic modules.
5. What does “VOC” stand for in solar terminology?
A. Voltage over current
B. Volt output capacity
C. Open circuit voltage
D. Variable operating current
Answer: C. Open circuit voltage
Rationale: VOC is the maximum voltage a solar panel produces when
not connected to a load.
6. Which device combines multiple PV string outputs into one
circuit?
A. Inverter
B. Combiner box
, C. Junction diode
D. Meter base
Answer: B. Combiner box
Rationale: A combiner box aggregates multiple string inputs into a
single output, simplifying system wiring.
7. What is the main purpose of grounding a PV system?
A. Increase power output
B. Prevent lightning formation
C. Provide a safe path for fault current
D. Reduce panel temperature
Answer: C. Provide a safe path for fault current
Rationale: Grounding ensures that fault currents are safely directed to
earth, reducing shock and fire hazards.
8. Which unit measures electrical power?
A. Volt
B. Ampere
C. Watt
D. Ohm
Questions With Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A | Instant
Download Pdf
1. What is the primary function of a photovoltaic (PV) system?
A. Convert sunlight into heat
B. Convert sunlight into electricity
C. Store wind energy
D. Convert electricity into light
Answer: B. Convert sunlight into electricity
Rationale: Photovoltaic systems use semiconductor materials
(typically silicon cells) to directly convert solar radiation into electrical
energy through the photovoltaic effect.
2. Which component converts DC electricity into AC electricity in a
solar system?
A. Charge controller
B. Combiner box
, C. Inverter
D. PV module
Answer: C. Inverter
Rationale: The inverter changes direct current (DC) produced by solar
panels into alternating current (AC), which is used by most household
and commercial appliances.
3. What is the purpose of a charge controller in a PV system?
A. Increase voltage output
B. Prevent battery overcharging
C. Convert AC to DC
D. Store electrical energy
Answer: B. Prevent battery overcharging
Rationale: A charge controller regulates voltage and current going
into batteries, protecting them from overcharging and extending their
lifespan.
4. Which factor most directly affects solar panel output?
A. Panel color
B. Ambient noise
, C. Sunlight intensity
D. Wire insulation type
Answer: C. Sunlight intensity
Rationale: The amount of irradiance (sunlight intensity) directly
impacts the electrical output of photovoltaic modules.
5. What does “VOC” stand for in solar terminology?
A. Voltage over current
B. Volt output capacity
C. Open circuit voltage
D. Variable operating current
Answer: C. Open circuit voltage
Rationale: VOC is the maximum voltage a solar panel produces when
not connected to a load.
6. Which device combines multiple PV string outputs into one
circuit?
A. Inverter
B. Combiner box
, C. Junction diode
D. Meter base
Answer: B. Combiner box
Rationale: A combiner box aggregates multiple string inputs into a
single output, simplifying system wiring.
7. What is the main purpose of grounding a PV system?
A. Increase power output
B. Prevent lightning formation
C. Provide a safe path for fault current
D. Reduce panel temperature
Answer: C. Provide a safe path for fault current
Rationale: Grounding ensures that fault currents are safely directed to
earth, reducing shock and fire hazards.
8. Which unit measures electrical power?
A. Volt
B. Ampere
C. Watt
D. Ohm
