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Return to Energy Science 4e Student Resources
Chapter 6 Multiple Choice Questions
*
not completed
1)
The percentage of global electricity production due to hydropower in 2018 was…
1.2%.
correct
incorrect
5%.
correct
incorrect
12%.
correct
incorrect
16%.
correct
incorrect
21%.
correct
incorrect
*
not completed
2)
The power per metre width in a typical ocean wave is about…
1 kW m
^{-}
^{1}
.
correct
incorrect
10 kW m
^{-}
^{1}
.
correct
incorrect
50 kW m
^{-}
^{1}
.
correct
incorrect
200 kW m
^{-}
^{1}
.
correct
incorrect
400 kW m
^{-}
^{1}
.
correct
incorrect
*
not completed
3)
Which one of the following statements is correct about a Fourneyron turbine?
It employs fixed guide vanes and fixed runner blades.
correct
incorrect
It employs fixed
guide vanes and moving runner blades.
correct
incorrect
It employs moving guide vanes and fixed runner blades.
correct
incorrect
It employs moving
guide vanes and moving runner blades.
correct
incorrect
*
not completed
4)
The country with the largest hydropower capacity in 2019 was…
Brazil.
correct
incorrect
Canada.
correct
incorrect
China.
correct
incorrect
Norway.
correct
incorrect
USA.
correct
incorrect
*
not completed
5)
The power output of a dam is given by…
$\eta \rho ghQ$
correct
incorrect
$\eta \rho Q\sqrt{gh}$
correct
incorrect
$\eta \rho g{h}^{2}Q$
correct
incorrect
$\eta \rho g{h}^{2}{Q}^{2}$
correct
incorrect
$\eta \rho gh{Q}^{3}$
correct
incorrect
*
not completed
6)
The maximum power output of a Pelton wheel is given by…
$\rho Qu$
correct
incorrect
$\frac{1}{2}\rho Q{u}^{3}$
correct
incorrect
$\frac{1}{2}\rho Q{u}^{\frac{1}{2}}$
correct
incorrect
$\frac{1}{2}\rho Q{u}^{2}$
correct
incorrect
$\sqrt{\rho Qu}$
correct
incorrect
*
not completed
7)
The maximum efficiency of a reaction turbine is given by…
${u}_{1}^{2}{q}_{1}\text{cos}{\beta}_{1}/gh$
correct
incorrect
${u}_{1}{q}_{1}\text{cos}{\beta}_{1}/\sqrt{gh}$
correct
incorrect
${u}_{1}{q}_{1}{\mathrm{cos}}^{2}{\beta}_{1}/gh$
correct
incorrect
${u}_{1}{q}_{1}\text{cos}{\beta}_{1}/2gh$
correct
incorrect
${u}_{1}{q}_{1}\text{cos}{\beta}_{1}/gh$
correct
incorrect
*
not completed
8)
Euler's equation provides a formula for the power output from a turbine. Does the fact that the derivation takes no account of the details of the flow inside the turbine (where the blades do work on the fluid) invalidate the formula?
Yes
correct
incorrect
No
correct
incorrect
*
not completed
9)
Which of the following statements are true?
Please select all that apply.
Dams with high carbon emissions tend to occur in low-lying areas, while those with low carbon emissions are mainly in mountainous regions.
correct
incorrect
It has been estimated that 300,000 to 600,000 people worldwide have had to be relocated because of hydropower.
correct
incorrect
In 2019 pumped storage provided about 95% of global electricity storage.
correct
incorrect
Impulse turbines are suited for fast-moving mountain streams. Francis turbines are suitable for run-of-river sites and Kaplan turbines for large dams.
correct
incorrect
Hydropower was the largest source of renewable energy in 2019, providing about twice the electricity as solar plus wind power.
correct
incorrect
*
not completed
10)
The typical capacity factor of a dam is of order…
1%.
correct
incorrect
10%.
correct
incorrect
25%.
correct
incorrect
40%.
correct
incorrect
90%.
correct
incorrect
*
not completed
11)
The interval between high tides is about…
6 hours.
correct
incorrect
9.5 hours.
correct
incorrect
12 hours.
correct
incorrect
12.5 hours.
correct
incorrect
24 hours.
correct
incorrect
*
not completed
12)
The velocity of a tidal wave of wavelength
λ
in a sea of depth
h
is given by…
$\sqrt{gh}$
correct
incorrect
$\sqrt{g\lambda}$
correct
incorrect
$\sqrt{g\lambda /2\pi}$
correct
incorrect
$\sqrt{g/h}$
correct
incorrect
*
not completed
13)
The country with the largest tidal potential in Europe is…
France.
correct
incorrect
Germany.
correct
incorrect
Ireland.
correct
incorrect
Spain.
correct
incorrect
UK.
correct
incorrect
*
not completed
14)
The velocity of a surface wave on deep water is given by…
$g\lambda $
correct
incorrect
$\sqrt{g\lambda}$
correct
incorrect
$\sqrt{g\lambda /2\pi}$
correct
incorrect
$\sqrt{2\pi g/\lambda}$
correct
incorrect
$g/2\pi \lambda $
correct
incorrect
*
not completed
15)
The total energy per unit width per unit length of a surface wave on deep water is given by…
$\frac{1}{2}\rho g{\lambda}^{2}$
correct
incorrect
$\frac{1}{2}\rho g{a}^{2}$
correct
incorrect
$\rho ga$
correct
incorrect
$\frac{1}{4}\rho g{a}^{2}$
correct
incorrect
$\frac{1}{2}\rho ga\lambda $
correct
incorrect
*
not completed
16)
Which of the following statements are true?
Please select all that apply.
A Wells turbine spins in both directions.
correct
incorrect
The maximum efficiency of a Pelton wheel is obtained when the incident jet is not deflected.
correct
incorrect
Hydropower in the EU is quite well exploited, but the potential for growth elsewhere is considerable, particularly in Asia, Latin America, and Africa.
correct
incorrect
The energy of a wave in deep water increases with depth.
correct
incorrect
There would be no tides if the Moon did not exist.
correct
incorrect
*
not completed
17)
Which of the following statements are true?
Please select all that apply.
The turbine in an oscillating water column is submerged in water.
correct
incorrect
Euler's turbine equation can be applied to a Pelton Wheel.
correct
incorrect
Wave energy convertors tend to operate near to the shore.
correct
incorrect
TAPCHAN has no moving parts (excluding the turbine).
correct
incorrect
The speed of a Pelton Wheel is controlled by a spear valve.
correct
incorrect
*
not completed
18)
The maximum power output of a dam with a head of 100 m and a volume flow rate of 1 m
^{3}
s
^{-1}
is about…
1 kW.
correct
incorrect
10 kW.
correct
incorrect
100 kW.
correct
incorrect
1 MW.
correct
incorrect
10 MW.
correct
incorrect
*
not completed
19)
Which of the following statements are true?
Please select all that apply.
Hydropower tends to be state-funded due to its high capital cost.
correct
incorrect
Hydropower has no carbon footprint.
correct
incorrect
The largest tidal range globally is in the River Severn, UK.
correct
incorrect
Water waves on deep water are dispersive.
correct
incorrect
Submerged wave energy convertors, with OWCs where appropriate, are emerging as the preferred technologies.
correct
incorrect
There is a larger global potential for tidal range plants than for tidal stream plants.
correct
incorrect
*
not completed
20)
The accessible potential of hydropower by 2050 is about…
2000 TWh y
^{-1}
.
correct
incorrect
4000 TWh y
^{-1}
.
correct
incorrect
7000 TWh y
^{-1}
.
correct
incorrect
15000 TWh y
^{-1}
.
correct
incorrect
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