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HelioScope

Milidzani Vikani 9 questions

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Questions in this quiz (9)

  1. 1With the PV array rack mounted at ground level, which would normally be of greatest concern?
    1. AOverheating of the modules
    2. BElectrical hazards from exposed (conductors) open circuit voltages
    3. CEarthquake stresses on the modules
    4. DPhysical damage to the array and wiring
  2. 2A concern associated with 12-V PV systems that use large wire sizes to minimize voltage drop is
    1. Athe difficulty in obtaining dc-rated disconnects with adequate current ratings.
    2. Bthe possibility of using junction boxes (terminal blocks) or switch boxes that are too small to house the large wire.
    3. Cthe difficulty in obtaining wire with dc-rated insulation
    4. Dthe possibility of animals chewing on the wires
  3. 3 φ Zenith
    a Azimuth
    ψ Altitude     Image for question 3
    1. ATrue
    2. BFalse
  4. 4If the PV modules, on the roof of the building of the following figure, are installed in the optimum way which is the correct orientation? (The building is sited in the Northern Hemisphere).
    Image for question 4
    1. A1
    2. B2
    3. C3
    4. D4
  5. 5Assume a roof-mounted PV array is to consist of two source circuits of four modules each. Assume the drawings are to scale and that the roof is large enough for any of the configurations shown. Which of the following configurations can be expected to result in the coolest operation of the modules?
    Image for question 5
    1. Aa
    2. Bb
    3. Cc
    4. Dd
  6. 66. If a proposed PV installation site has an unobstructed south-facing roof area of 60 m2
    , and if thin-film modules with six
    watts-per-square-foot power output at STC are to be installed on 50% of the roof, then the maximum available PV
    array output power (based on the sum of module ratings) at STC will be closest to
    1. A4500 watts
    2. B3600 watts
    3. C2250 watts
    4. D1900 watts
  7. 7A typical 4-kW crystalline silicon array is operating at STC in a utility-interactive system with battery backup. The STC maximum power voltage rating of the PV array is 68.4 volts. The system uses a MPT charge controller that has 5% losses. Wiring losses are 3% and inverter losses are 5%. If the batteries are at full charge at a voltage of 52 V, and if all PV output is delivered to the grid (assume that no power is being used to hold the batteries at 52 volts), the inverter output power will be closest to a. 1261 watts b. 2207 watts c. 2522 watts d. 3152 watts
    1. A1261 watts
    2. B2207 watts
    3. C2522 watts
    4. D3152 watts
  8. 8A PV system is to be selected for operating a PV water pumping system. The pump will require 300 W of PV modules
    for proper operation. A 12 -Vdc model and a 48-Vdc model are available. If both pumps operate at the same power
    level, the resistance of the wire to the 48-V pump, compared to the resistance of the wire to the 12-V pump, assuming
    the same percentage voltage drop in the wiring, may be
    1. A1/16th as much
    2. B1/4th as much
    3. C4 times as much
    4. D16 times as much
  9. 9The further north you are, the better it is to
    1. Awash your array
    2. Bincrease your tilt angle
    3. Cdecrease your tilt angle
    4. Ddecrease your azimuth

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PV design tool
Language
English
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