Engineering

Question 1

1The national electricity grid

Easy

A. carries gas B. stores all electricity C. transmits power from generating stations to consumers D. produces water

Question 2

2The three main parts of a power supply system are generation, transmission and

Easy

A. metering only B. consumption tax C. storage only D. distribution

Question 3

3Electricity is transmitted at high voltage to

Easy

A. make it safer at home B. increase current C. reduce energy losses in the cables D. make it brighter

Question 4

4Electricity is transmitted over long distances at very high voltage mainly to

Medium

A. change it into DC B. make it more dangerous C. reduce power losses in the cables D. increase the current

Question 5

5A mini-grid supplies electricity to

Easy

A. the whole country B. a local community not connected to the national grid C. satellites D. only factories abroad

Question 6

6Transmitting 1 MW at 100 kV instead of 10 kV reduces I²R losses by a factor of

Hard

A. 2 B. 10 C. 1,000 D. 100

Question 7

7Energy storage systems such as batteries help to

Easy

A. waste energy B. increase demand C. balance supply when generation is low D. reduce efficiency always

Question 8

8The company that distributes electricity in southern Ghana is

Easy

A. ECG B. GNPC C. GWCL D. VRA only

Question 9

9A thermal power plant generates electricity by

Easy

A. using wind B. using sunlight directly C. burning fuel to make steam that drives turbines D. using tides