Building Services Engineering 5th Edition Handbook

Heating 123
46. What does stoichiometric ratio mean?
1. Optimum efficiency.
2. Maximum oxygen in flue gas.
3. Maximum carbon dioxide in flue gas.
4. Poor combustion.
5. 100% excess air provided.
47. Which is not correct about combined heat and power plant?
1. Reject steam from turbine at higher pressure and temperature than in conventional
plant.
2. About 30% efficient at converting fuel energy into electricity.
3. Must always be gas-turbine-driven generation.
4. Can be gas-turbine-driven generation.
5. Plant overall thermal efficiency around 50%.
48. Which is correct about conventional power generation?
1. Steam boilers work at the lowest practical pressure.
2. Boilers generate steam at the highest practical pressure.
3. Wet steam leaves the boilers.
4. Modern power plant does not use steam.
5. Steam is an out of date heating method.
49. Which is correct about nuclear-sourced conventional power generation?
1. Nuclear power stations never create any greenhouse gases.
2. They will become the sole means of generating electricity.
3. They are too dangerous to build.
4. Spent nuclear fuel rods are safe to handle.
5. Spent nuclear fuel rods remain radioactive for thousands of years.
50. Which is correct about nuclear-sourced conventional power generation?
1. Uranium is combusted to produce steam.
2. Uranium fusion releases heat.
3. Fission of Uranium releases heat.
4. Uranium corrodes into lead in releasing heat.
5. Radiation from Uranium releases heat.
51. Which is correct about nuclear-sourced conventional power generation?
1. Pressurized water nuclear reactor uses water to drive the electricity generator.
2. Pressurized water nuclear reactor generates steam to drive turbines.
3. Sodium gas-cooled nuclear reactors are the most popular type.
4. Carbon dioxide gas-cooled nuclear reactors are the most popular type.
5. Oil-cooled nuclear reactors are the most popular type.
52. Which is correct for district heating?
1. Heat supplied is charged to the consumer on a flat rate such as £/m 2 floor area.
2. Heat supplied is charged at an annual fixed price to consumer.
3. Heat supplied is charged at an annual fixed price irrespective of how much is
consumed.