1. Many power stations produce CO2 .Which one of these does not?
2. Which one of these statements about power stations is true?
A. Continuous conversion of thermal energy into work in a cyclical process can be 100% efficient.
B. Degraded thermal energy can be used to produce useful work.
C. The efficiency of a powerstation is typically 70%.
D. Electrical energy is generated by rotating coils in a magnetic field in a generator.
3. 'Energy density' is defined as
A. the fraction of total energy available by combustion
B. the energy per unit volume
C. the energy per unit mass
D. the total energy available per mole
4. Which of these answers correctly describes the uses and properties of the 3 fossil fuels?
Most used worldwide in electricity generation
Highest efficiency in a power station
5. Photovoltaic cells are not in widespread use. Which one of these is not a reason for this?
A. High start-up costs
B. Low output per square meter
D. Lack of available suitable locations worldwide
6. Which of these answers correctly describes the transportation and storage problems associated with fossil fuels?
Easiest to store on site
Easiest to transport
7. The output of a solar panel in Norway is less than that in Egypt because
A. There are less total daylight hours over a year.
B. The intensity of radiation is less.
C. the solar constant is lower in Norway.
D. The albedo of the Earth is greater in Norway.
8. A hydroelectric scheme converts
A. gravitational to kinetic to electrical energy
B. kinetic to electrical energy
C. gravitational to mechanical energy
D. kinetic to gravitational to electrical energy
9. Which of these energy resources has the Sun as the original energy source?
10. A wind generator can never be 100% efficient because
A. some of the air flow will retain some kinetic energy
B. the generator must be switched off in high wind speeds
C. some air will hit the generator support
D. some air will pass underneath the blades
11. A horizontal axis wind turbine of radius r is producing power with a wind speed of velocity v. In theory, if the wind speed AND radius of the turbine are both doubled, the power output will be increased by a factor of