* not completed

. PV modules are normally sold by their power rating in peak watts (W_p). This is their output under what kind of illumination?

An 'average' cloudy day correct incorrect

'Average' daylight for a whole year correct incorrect

Bright sunlight with an intensity of 1000 W m^-2 correct incorrect

* not completed

. n-type silicon can be produced by doping it with which element?

Carbon correct incorrect

Boron correct incorrect

Phosphorus correct incorrect

Germanium correct incorrect

* not completed

. Which photons of solar radiation have the most energy?

There is no difference correct incorrect

Infra-red radiation correct incorrect

Blue light correct incorrect

* not completed

. A gallium arsenide PV cell has a band-gap of 1.4 eV. It is illuminated with photons of green light with energy of 2 eV. What is likely to happen to them?

All of their energy will be absorbed and converted to electricity. correct incorrect

1.4 eV will be absorbed to produce electricity and the rest wasted as heat correct incorrect

They will have no electrical effect correct incorrect

* not completed

. The Czochralski process is used for producing which of these?

Monocrystalline crystals of pure silicon correct incorrect

Metallurgical grade silicon correct incorrect

Polycrystalline silicon correct incorrect

* not completed

. Which of the following is NOT a semiconductor used in PV applications?

Gallium arsenide correct incorrect

Silver correct incorrect

Titanium dioxide correct incorrect

Copper indium diselenide correct incorrect

Amorphous silicon correct incorrect

Cadmium telluride correct incorrect

* not completed

. The 'maximum power point' on the current-voltage curve for a PV cell is the point at which it produces:

Maximum voltage x current correct incorrect

Maximum current correct incorrect

Maximum voltage correct incorrect

Maximum voltage / current correct incorrect

* not completed

. Figure 4.22 on page 136 shows an array of four modules connected in parallel. Each module contains six cells connected in series. If each individual PV cell produces 500 mA at 0.5 volts what will be the total output of the whole array?

500 mA at 6 volts correct incorrect

1 amp at 6 volts correct incorrect

500 mA at 3 volts correct incorrect

2 amps at 3 volts correct incorrect

* not completed

. Some chemicals used in PV module production are strong greenhouse gases and must not be allowed to be released into the atmosphere. Select one from the list below.

Sulfur hexafluoride correct incorrect

Silicon tetrachloride correct incorrect

Cadmium correct incorrect

* not completed

. How much of the world's electricity did PV provide in 2015?

0.1% correct incorrect

1% correct incorrect

5% correct incorrect