최신NABCEP PV Installation Professional (PVIP) Board Certification - PVIP무료샘플문제
문제1
A PV system's inverter displays a ground-fault error. What is the first troubleshooting step?
A PV system's inverter displays a ground-fault error. What is the first troubleshooting step?
정답: C
문제2
A PV array's tilt is 30° at a latitude of 40°N. What is the winter energy loss compared to optimal tilt?
A PV array's tilt is 30° at a latitude of 40°N. What is the winter energy loss compared to optimal tilt?
정답: A
문제3
A module's Voc is 40V at STC. At -5°C with a coefficient of -0.33%/°C, what is the Voc?
A module's Voc is 40V at STC. At -5°C with a coefficient of -0.33%/°C, what is the Voc?
정답: B
문제4
A PV system is designed for a location with a peak sun hours (PSH) value of 4.5. The daily load is 18 kWh, and the system efficiency is 80%. What is the minimum array size required in kW?
A PV system is designed for a location with a peak sun hours (PSH) value of 4.5. The daily load is 18 kWh, and the system efficiency is 80%. What is the minimum array size required in kW?
정답: D
문제5
A PV module has a temperature coefficient of power of -0.4%/°C and a rated power of 300W at STC (25°C).
What is the expected power output if the module temperature rises to 55°C?
A PV module has a temperature coefficient of power of -0.4%/°C and a rated power of 300W at STC (25°C).
What is the expected power output if the module temperature rises to 55°C?
정답: D
문제6
A PV system has a nameplate capacity of 10 kW DC and operates with a total system derate factor of 0.85.
What is the expected AC output power under standard test conditions (STC)?
A PV system has a nameplate capacity of 10 kW DC and operates with a total system derate factor of 0.85.
What is the expected AC output power under standard test conditions (STC)?
정답: C
문제7
Which of the following should a PV installer do during dc insulation resistance testing?
Which of the following should a PV installer do during dc insulation resistance testing?
정답: A
문제8
A grid-connected PV system on a dwelling is producing 30% less power than expected. The conductors from threes strings of modules enter into a 3-pole fused dc disconnect, and each ungrounded conductor is connected to a separate pole. On the inverter side of the switch terminals, the three strings are combined. The dc disconnect switch is opened. The voltages on the array side of the switch are 440 on string #1, 444V on string #2, and 0V on string #3. The dc disconnect is then closed and the inverter resumes operating, still producing about 30% less power than expected. A clamp-on ammeter is used to measure the dc current of each string of each string of modules where they enter the rooftop junction box. The operating currents of each string are 3.9A for string #1, 3 85A for string #2, and 4.3 A for string #3. What is the MOST likely with the system?
A grid-connected PV system on a dwelling is producing 30% less power than expected. The conductors from threes strings of modules enter into a 3-pole fused dc disconnect, and each ungrounded conductor is connected to a separate pole. On the inverter side of the switch terminals, the three strings are combined. The dc disconnect switch is opened. The voltages on the array side of the switch are 440 on string #1, 444V on string #2, and 0V on string #3. The dc disconnect is then closed and the inverter resumes operating, still producing about 30% less power than expected. A clamp-on ammeter is used to measure the dc current of each string of each string of modules where they enter the rooftop junction box. The operating currents of each string are 3.9A for string #1, 3 85A for string #2, and 4.3 A for string #3. What is the MOST likely with the system?
정답: C
문제9
When running horizontal 1-1/4 in, electrical metallic tubing (EMT) with compression fittings, what is the MAXIMUM permissible distance between condult supports?
When running horizontal 1-1/4 in, electrical metallic tubing (EMT) with compression fittings, what is the MAXIMUM permissible distance between condult supports?
정답: C
문제10
A PV array is located 8 feet from a property line. What is the minimum height above ground for exposed DC conductors per NEC 690.31?
A PV array is located 8 feet from a property line. What is the minimum height above ground for exposed DC conductors per NEC 690.31?
정답: C
문제11
Which is a requirement for designated battery rooms?
Which is a requirement for designated battery rooms?
정답: D