AZ L-94 Solar Photovoltaic Contractor
Exam Practice Questions And Correct
Answers (Verified Answers) Plus
Rationales 2027 Q&A | Instant
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1.
What is the primary function of a photovoltaic (PV) module?
A. Convert AC electricity to DC electricity
B. Convert sunlight directly into DC electrical energy
C. Store electrical energy for nighttime use
D. Convert DC electricity into AC electricity
Answer: B. Convert sunlight directly into DC electrical energy
Rationale: A PV module uses semiconductor cells to convert solar radiation
directly into direct-current electrical energy.
2.
,What happens when PV modules are connected in series?
A. Current increases while voltage remains constant
B. Voltage increases while current remains approximately the same
C. Both voltage and current become zero
D. Voltage decreases while current increases
Answer: B. Voltage increases while current remains approximately the
same
Rationale: In a series string, module voltages add while the current is
limited by the string's operating current.
3.
What happens when identical PV modules are connected in parallel?
A. Voltage increases
B. Current increases while voltage remains approximately the same
C. Voltage and current both decrease
D. The modules become disconnected
Answer: B. Current increases while voltage remains approximately the
same
Rationale: Parallel-connected identical sources maintain approximately
the same voltage while their available currents add.
,4.
What does the term Isc mean on a PV module datasheet?
A. Inverter short-circuit capacity
B. Insulation system current
C. Short-circuit current
D. Maximum operating voltage
Answer: C. Short-circuit current
Rationale: Isc is the current produced by a PV module when its output
terminals are short-circuited under specified test conditions.
5.
What does Voc represent?
A. Voltage at maximum power
B. Open-circuit voltage
C. Operating circuit voltage
D. Overcurrent voltage
Answer: B. Open-circuit voltage
Rationale: Voc is the voltage measured across a PV source when no load is
connected.
, 6.
A PV module produces 40 V at open circuit. Four identical modules are
connected in series. What is the approximate string open-circuit voltage?
A. 10 V
B. 40 V
C. 80 V
D. 160 V
Answer: D. 160 V
Rationale: Series voltages add, so 4 × 40 V = 160 V.
7.
A PV array produces 8 kW at 400 V. Approximately what current is produced
at that operating point?
A. 10 A
B. 20 A
C. 30 A
D. 40 A
Answer: B. 20 A
Rationale: Using P = V × I, I = 8,000 ÷ 400 = 20 A.
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. Convert AC electricity to DC electricity
B. Convert sunlight directly into DC electrical energy
C. Store electrical energy for nighttime use
D. Convert DC electricity into AC electricity
Answer: B. Convert sunlight directly into DC electrical energy
Rationale: A PV module uses semiconductor cells to convert solar radiation
directly into direct-current electrical energy.
2.
,What happens when PV modules are connected in series?
A. Current increases while voltage remains constant
B. Voltage increases while current remains approximately the same
C. Both voltage and current become zero
D. Voltage decreases while current increases
Answer: B. Voltage increases while current remains approximately the
same
Rationale: In a series string, module voltages add while the current is
limited by the string's operating current.
3.
What happens when identical PV modules are connected in parallel?
A. Voltage increases
B. Current increases while voltage remains approximately the same
C. Voltage and current both decrease
D. The modules become disconnected
Answer: B. Current increases while voltage remains approximately the
same
Rationale: Parallel-connected identical sources maintain approximately
the same voltage while their available currents add.
,4.
What does the term Isc mean on a PV module datasheet?
A. Inverter short-circuit capacity
B. Insulation system current
C. Short-circuit current
D. Maximum operating voltage
Answer: C. Short-circuit current
Rationale: Isc is the current produced by a PV module when its output
terminals are short-circuited under specified test conditions.
5.
What does Voc represent?
A. Voltage at maximum power
B. Open-circuit voltage
C. Operating circuit voltage
D. Overcurrent voltage
Answer: B. Open-circuit voltage
Rationale: Voc is the voltage measured across a PV source when no load is
connected.
, 6.
A PV module produces 40 V at open circuit. Four identical modules are
connected in series. What is the approximate string open-circuit voltage?
A. 10 V
B. 40 V
C. 80 V
D. 160 V
Answer: D. 160 V
Rationale: Series voltages add, so 4 × 40 V = 160 V.
7.
A PV array produces 8 kW at 400 V. Approximately what current is produced
at that operating point?
A. 10 A
B. 20 A
C. 30 A
D. 40 A
Answer: B. 20 A
Rationale: Using P = V × I, I = 8,000 ÷ 400 = 20 A.
