최신NABCEP PV Installation Professional (PVIP) Board Certification - PVIP무료샘플문제
문제1
Which circuits are on the utility side of a service point?
Which circuits are on the utility side of a service point?
정답: C
문제2
A 15 kW array has a PR of 0.88 and 1600 kWh/m²/year insolation. What is the annual output?
A 15 kW array has a PR of 0.88 and 1600 kWh/m²/year insolation. What is the annual output?
정답: C
문제3
How should stratification be eliminated in a set of large, stationary, stationary flooded lead-acid batteries?
How should stratification be eliminated in a set of large, stationary, stationary flooded lead-acid batteries?
정답: C
문제4
According to the NEC, where on a residential PV system MUST the labeling describing the type of rapid shutdown be located?
According to the NEC, where on a residential PV system MUST the labeling describing the type of rapid shutdown be located?
정답: C
문제5
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: B
문제6
A PV module is mounted with a 2-inch standoff from a shingle roof. What is the minimum clearance required for fire access per the International Fire Code (IFC)?
A PV module is mounted with a 2-inch standoff from a shingle roof. What is the minimum clearance required for fire access per the International Fire Code (IFC)?
정답: B
문제7
A commercial 600v carport-mounted PV system is installed with rigid running under the parking lot to an inverter pad located at the edge of the parking lot. At what depth below the parking lot base MUST condult be buried?
A commercial 600v carport-mounted PV system is installed with rigid running under the parking lot to an inverter pad located at the edge of the parking lot. At what depth below the parking lot base MUST condult be buried?
정답: C
문제8
A system's inverter output is 9 kW at 900 W/m² irradiance. What is the expected output at 1000 W/m²?
A system's inverter output is 9 kW at 900 W/m² irradiance. What is the expected output at 1000 W/m²?
정답: A
문제9
When installing an ungrounded PV system with an open-circuit voltage of 450Vdc and a maximum voltage of
3000Vdc which procedures should be followed to establish an electrically safe condition?
When installing an ungrounded PV system with an open-circuit voltage of 450Vdc and a maximum voltage of
3000Vdc which procedures should be followed to establish an electrically safe condition?
정답: A
문제10
A site survey indicates a residential roof with a 4:12 pitch facing 20° east of south. The local latitude is 35°N, and the optimal tilt for maximum annual production is equal to latitude. What adjustment should be made to compensate for the roof's orientation and tilt to achieve near-optimal output?
A site survey indicates a residential roof with a 4:12 pitch facing 20° east of south. The local latitude is 35°N, and the optimal tilt for maximum annual production is equal to latitude. What adjustment should be made to compensate for the roof's orientation and tilt to achieve near-optimal output?
정답: A
문제11
A rooftop PV system is being installed on a residential building with a 30-degree tilt angle. The modules are oriented directly south in a location where the solar noon altitude on December 21st is 30 degrees. What is the minimum distance required between two rows of modules to avoid shading between 9 AM and 3 PM solar time, assuming the module height is 3 feet?
A rooftop PV system is being installed on a residential building with a 30-degree tilt angle. The modules are oriented directly south in a location where the solar noon altitude on December 21st is 30 degrees. What is the minimum distance required between two rows of modules to avoid shading between 9 AM and 3 PM solar time, assuming the module height is 3 feet?
정답: D
문제12
A metal condult containing an array circuit with Vmo of 400Vdc is connected to a metal enclosure at the location where the concentric knockouts have been punched by the manufacturer. Which method of attachment should be used?
A metal condult containing an array circuit with Vmo of 400Vdc is connected to a metal enclosure at the location where the concentric knockouts have been punched by the manufacturer. Which method of attachment should be used?
정답: A
문제13
A racking system is designed for a wind speed of 120 mph. The site's design wind speed increases to 130 mph. What is the percentage increase in wind pressure?
A racking system is designed for a wind speed of 120 mph. The site's design wind speed increases to 130 mph. What is the percentage increase in wind pressure?
정답: C
문제14
A ground-mount PV system is planned for a site with a soil bearing capacity of 2000 psf. The array footing design requires a minimum bearing pressure of 1500 psf. What is the safety factor for this installation?
A ground-mount PV system is planned for a site with a soil bearing capacity of 2000 psf. The array footing design requires a minimum bearing pressure of 1500 psf. What is the safety factor for this installation?
정답: C