CT Solar Pv Contractor Exam
Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A| Instant Download Pdf
1. What is the primary purpose of a solar photovoltaic (PV) system?
A. Heat water for domestic use
B. Generate electricity from sunlight
C. Store electrical energy in batteries
D. Reduce greenhouse gases
B. Generate electricity from sunlight
Rationale: The main function of a solar PV system is to convert sunlight
directly into electrical energy using the photovoltaic effect.
2. Which type of solar panel is known for the highest efficiency under
standard conditions?
A. Thin-film
B. Polycrystalline
C. Monocrystalline
D. Amorphous
C. Monocrystalline
Rationale: Monocrystalline panels have the highest efficiency due to their
uniform silicon crystal structure, typically around 18–22%.
3. What is the typical lifespan of a modern solar PV module?
A. 5–10 years
B. 10–15 years
, C. 20–25 years
D. 30–35 years
C. 20–25 years
Rationale: Most solar PV modules are designed to last 20–25 years, with
warranties guaranteeing performance for at least 80% of original capacity
over 25 years.
4. Which device is used to convert DC power generated by solar panels
into AC power for use in homes?
A. Inverter
B. Transformer
C. Charge controller
D. Circuit breaker
A. Inverter
Rationale: Inverters convert the DC electricity produced by PV panels into
AC electricity compatible with household appliances.
5. Which factor most affects the energy output of a solar PV system?
A. Color of panels
B. Ambient humidity
C. Angle and orientation of panels
D. Panel thickness
C. Angle and orientation of panels
Rationale: Proper tilt and orientation towards the sun maximize sunlight
exposure and system efficiency.
6. What is the standard test condition (STC) voltage of a solar panel
measured at?
A. 25°C
B. 50°C
C. 0°C
D. 75°C
, A. 25°C
Rationale: STC refers to a cell temperature of 25°C, solar irradiance of
1000 W/m², and air mass 1.5 for consistent performance comparison.
7. What is the main function of a solar charge controller in an off-grid
system?
A. Convert DC to AC
B. Prevent battery overcharging and deep discharge
C. Store solar energy in panels
D. Increase sunlight absorption
B. Prevent battery overcharging and deep discharge
Rationale: Charge controllers regulate the voltage and current going into
batteries to protect them and extend battery life.
8. Which of the following is an advantage of an off-grid solar PV system?
A. Continuous power during grid outages
B. Lower initial installation cost
C. No need for batteries
D. Unlimited power availability
A. Continuous power during grid outages
Rationale: Off-grid systems operate independently of the utility grid,
ensuring uninterrupted power where no grid exists.
9. What does “kWp” stand for in solar PV terminology?
A. Kilowatt per panel
B. Kilowatt peak
C. Kilowatt production
D. Kilowatt potential
B. Kilowatt peak
Rationale: kWp measures the maximum power a PV system can produce
under standard test conditions.
10. Which type of solar inverter allows grid interaction while
providing backup during outages?
A. String inverter
Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A| Instant Download Pdf
1. What is the primary purpose of a solar photovoltaic (PV) system?
A. Heat water for domestic use
B. Generate electricity from sunlight
C. Store electrical energy in batteries
D. Reduce greenhouse gases
B. Generate electricity from sunlight
Rationale: The main function of a solar PV system is to convert sunlight
directly into electrical energy using the photovoltaic effect.
2. Which type of solar panel is known for the highest efficiency under
standard conditions?
A. Thin-film
B. Polycrystalline
C. Monocrystalline
D. Amorphous
C. Monocrystalline
Rationale: Monocrystalline panels have the highest efficiency due to their
uniform silicon crystal structure, typically around 18–22%.
3. What is the typical lifespan of a modern solar PV module?
A. 5–10 years
B. 10–15 years
, C. 20–25 years
D. 30–35 years
C. 20–25 years
Rationale: Most solar PV modules are designed to last 20–25 years, with
warranties guaranteeing performance for at least 80% of original capacity
over 25 years.
4. Which device is used to convert DC power generated by solar panels
into AC power for use in homes?
A. Inverter
B. Transformer
C. Charge controller
D. Circuit breaker
A. Inverter
Rationale: Inverters convert the DC electricity produced by PV panels into
AC electricity compatible with household appliances.
5. Which factor most affects the energy output of a solar PV system?
A. Color of panels
B. Ambient humidity
C. Angle and orientation of panels
D. Panel thickness
C. Angle and orientation of panels
Rationale: Proper tilt and orientation towards the sun maximize sunlight
exposure and system efficiency.
6. What is the standard test condition (STC) voltage of a solar panel
measured at?
A. 25°C
B. 50°C
C. 0°C
D. 75°C
, A. 25°C
Rationale: STC refers to a cell temperature of 25°C, solar irradiance of
1000 W/m², and air mass 1.5 for consistent performance comparison.
7. What is the main function of a solar charge controller in an off-grid
system?
A. Convert DC to AC
B. Prevent battery overcharging and deep discharge
C. Store solar energy in panels
D. Increase sunlight absorption
B. Prevent battery overcharging and deep discharge
Rationale: Charge controllers regulate the voltage and current going into
batteries to protect them and extend battery life.
8. Which of the following is an advantage of an off-grid solar PV system?
A. Continuous power during grid outages
B. Lower initial installation cost
C. No need for batteries
D. Unlimited power availability
A. Continuous power during grid outages
Rationale: Off-grid systems operate independently of the utility grid,
ensuring uninterrupted power where no grid exists.
9. What does “kWp” stand for in solar PV terminology?
A. Kilowatt per panel
B. Kilowatt peak
C. Kilowatt production
D. Kilowatt potential
B. Kilowatt peak
Rationale: kWp measures the maximum power a PV system can produce
under standard test conditions.
10. Which type of solar inverter allows grid interaction while
providing backup during outages?
A. String inverter
