Self-test questions: Chapter 06

Self-test questions: Chapter 06

. Fish ladders have been installed at some of the Galloway hydro dams to allow which fish to reach their spawning grounds?

. China's electricity consumption in 2016 was 6200 terawatt-hours, mainly generated using coal. Given the data in Table 6.4 on page 246, estimate roughly what proportion might be supplied if the country's technical hydro potential were fully developed.

. As described on page 250, the potential energy stored by raising water in a pumped storage plant is given by:

. The power output from a hydroelectric plant is given on page 253 by the equation P(kW) = 10 x η x Q x H, where η is the efficiency, Q the water flow rate in cubic metres per second and H the effective head. A small 8.5 kW plant installed in a river in south London has an efficiency of 70% and an effective head of 1.2 metres. What is the approximate design flow rate?

. The Hoover Dam, when full, has a head of 220 metres. What is the water pressure in the turbine house at the base of the dam?

. Different types of turbine are used according to the water head and flow rate. Which type is used for high heads?

. What important greenhouse gas can be produced from rotting vegetation in hydro reservoirs?

. Roughly how many people were displaced by the construction of the Three Gorges Dam in China?

. Hydro schemes are capital intensive. Which of the below discount rate options used on borrowed money will give the lowest electricity cost per kilowatt-hour?

. In 2016 Africa had a total installed hydro capacity of about 34 GW. By how much would this be increased if the Inga 3 scheme on the River Congo were constructed?

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