Chapter 8 Multiple Choice Questions

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1) The average solar power incident on the Earth's surface is about…

1000 mW cm⁻². correct incorrect

1 kW m⁻². correct incorrect

100 W cm⁻². correct incorrect

1000 W cm⁻². correct incorrect

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2) Full sunlight is falling on a 20% efficiency solar cell of area 2 m² at an angle of incidence of 60 degrees normal to the cell. What is the output power of the cell?

100 W correct incorrect

200 W correct incorrect

400 W correct incorrect

600 W correct incorrect

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3) When a p-type solar cell is illuminated with light, photons with energies greater than the ____ ____ excite electrons in the ___-region from the ____ band to the _____ band. When these electrons come within the ____ ____ ____, they are swept into the ____-type region, producing a ____ _____ that can drive a _____ through an appliance.

Your response

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4) Match the band gaps to the semiconductors.

4a.

Perovskite

Select an answer choice 1.5 eV 1.1 eV 1.7 eV 0.7 eV

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4b.

CdTe

Select an answer choice 0.7 eV 1.5 eV 1.1 eV 1.7 eV

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4c.

Si

Select an answer choice 1.5 eV 0.7 eV 1.7 eV 1.1 eV

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4d.

GaSb

Select an answer choice 1.5 eV 1.7 eV 1.1 eV 0.7 eV

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5) Match the percentage losses in a silicon solar cell to the following:

5a.

Photons with energies less than 1.1 eV

Select an answer choice 10% 55% 23%

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5b.

The voltage factor loss

Select an answer choice 23% 10% 55%

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5c.

Incomplete charge collection

Select an answer choice 10% 23% 55%

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6) A photocell has a short circuit current of 25 mA, an open circuit voltage of 0.6 V, and a maximum power output of 12 mW. What is its fill factor?

50% correct incorrect

65% correct incorrect

80% correct incorrect

95% correct incorrect

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7) A photocell has a short circuit current of 40 mA and an open circuit voltage of 0.6 V. What value of resistor across the cell would dissipate the most power?

6.7 Ω correct incorrect

13.5 Ω correct incorrect

18 Ω correct incorrect

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8) For a multilayer photocell, which of the following statements are true? Please select all that apply.

The layer with the smallest band gap is the first or upper layer. correct incorrect

The current is limited to the smallest current in a layer. correct incorrect

The open circuit voltage is the sum of the open circuit voltages from each layer. correct incorrect

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9) A two-junction solar cell made by adding a perovskite layer on top of a silicon solar cell could have an efficiency of about…

33%. correct incorrect

40%. correct incorrect

50%. correct incorrect

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10) A 100 kWp array of solar panels is located in the south west of the USA. What is the best estimate of the annual output?

19 GWh correct incorrect

220 MWh correct incorrect

19 MWh correct incorrect

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11) The capacity factor of a solar PV farm (without tracking) in southern India is approximately…

15%. correct incorrect

20%. correct incorrect

25%. correct incorrect

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12) The optimum orientation for a panel located at a latitude of 40 degrees north is…

pointing south with its normal at an angle of 40 degrees to the horizontal. correct incorrect

pointing west with its normal at an angle of 40 degrees to the vertical. correct incorrect

pointing north with its normal at an angle of 40 degrees to the horizontal. correct incorrect

pointing south with its normal at an angle of 40 degrees to the vertical. correct incorrect

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13) A factory is in a region where the tilted insolation, GTI, is 2000 kWh m⁻² y⁻¹. What approximate area of solar panels would be required to produce 100,000 kWh of electricity per annum?

50 m² correct incorrect

240 m² correct incorrect

280 m² correct incorrect

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14) Rooftop solar PV gives the owner the opportunity to sell surplus generation back to the grid, called _____ _____, or, if on a ____-grid, to trade electricity using ______ to ensure secure exchange of information.

Your response

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15) During 2006–2018, global module costs fell by a factor X, and during 2009–2018 the price of electricity from PV in the USA fell by a factor of Y to ~Z cents per kWh

X=4; Y= 3; Z = 10.5 correct incorrect

X=7; Y= 8; Z = 8.5 correct incorrect

X=11; Y= 8; Z = 4.5 correct incorrect

X=15; Y= 12; Z = 3.5 correct incorrect

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16) What can be said about solar PV?
Please select all that apply.

It is now cheaper than coal and gas in most major countries. correct incorrect

It requires an electrical grid. correct incorrect

It is can be used to provide fast-reacting backup for a grid. correct incorrect

It could provide with massive investment 40000 TWh per year by 2050. correct incorrect

It can be more efficient when floating on water. correct incorrect

It requires direct radiation. correct incorrect

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17) The associated CO₂ emissions from PV panels compared to gas turbine generated electricity are about…

5%. correct incorrect

10%. correct incorrect

20%. correct incorrect

30%. correct incorrect

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18) What approximate area of a PV farm in Egypt would be required to produce an annual output of 10 TWh?

40 km². correct incorrect

75 km². correct incorrect

200 km². correct incorrect

400 km². correct incorrect

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19) Environmental effects of PV power can include damage from _____ materials, adverse _____ impact, a loss of _____, and degradation of the _____.

Your response

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20) In 2019, the percentage of global electricity from solar photovoltaics was…

2.7%. correct incorrect

4.2%. correct incorrect

6.7%. correct incorrect