Hydro Power Plants

Q.

Name two sources of electricity.

Q.

In a hydroelectric power plant more electrical power can be generated if water falls from a greater height because:

1. the electricity content of water increases with heigh

2. more water molecules dissociate into ions

3. its temperature increases

4. larger amount of potential energy is converted into kinetic energy

Q.

What is the sequence of energy conversions takes place in hydro power plants?

1. Potential Energy - Kinetic Energy - Thermal Energy - Electrical Energy

2. Potential Energy - Kinetic Energy - Mechanical Energy - Electrical Energy

3. Potential Energy- Chemical Energy- Kinetic Energy - Electrical Energy

4. Nuclear Energy - Thermal Energy - Kinetic Energy - Electrical Energy

Q.

(i) What is an AC generator or dynamo used for?

(ii) Name the principle on which it works.

Q.

In an AC generator, a coil wound over a soft iron core is called?

1. slip ring.

2. brush.

3. armature.

4. field magnet.

Q.

Which power plant works on the basis of gravity of Earth?

1. Geothermal
2. Nuclear energy
3. Wind forms
4. Hydropower

Q.

Name two types of generators?

Q. The electricity generation by water turbine is the conversion of:

1. Mechanical Energy to Electrical Energy
2. Electrical Energy to Mechanical Energy
3. Thermal Energy to Mechanical Energy
4. Thermal Energy to Electrical Energy

Q.

How can you convert an AC generator into a DC generator?

Q.

A wind power plant does not cause ___, so it is the cleanest source of energy.

Q.

Choose the correct statement:

1. Waste from a nuclear power plant can be easily disposed off

2. Sun can be taken as an inexhaustible source of energy

3. There is infinite storage of fossil fuel inside the earth

4. Hydro and wind energy plants are non polluting sources of energy

Q.

Which of the following is not a source of bio mass fuel?

1. Gobar gas

2. Coal

3. Wood

4. Nuclear Energy

Q. ___

energy locked in the biomass gets converted into electrical energy, in the process of generating electricity.

1. Chemical

2. Kinetic

3. Nuclear

4. Muscular

Q. Which source of energy would inhabitants of a forest prefer?

1. Nuclear energy
2. Coal
3. Wood
4. Wind energy

Q.

If I place a turbine in a fast flowing stream of the river without building a dam. What will be the energy conversion?

1. wind energy to electrical energy

2. kinetic energy to electrical energy

3. potential energy to electrical energy

4. heat energy to electrical energy

Q.

If you are stuck in a forest which source of energy will you prefer and why?

1. coal

2. wood

3. nuclear energy

4. wind energy

Q.

What energy conversion takes place in hydropower plants?

1. kinetic to potential to electric

2. all of these

3. potential - kinetic- electrical

4. potential to chemical to electric

Q.

what is source of sun

Q. Which of these are the disadvantages of hydropower generation?

1. Dams can be constructed only in limited areas.
2. Large areas of land get submerged within water when dams are constructed.
3. Submerged vegetation rots under anaerobic conditions and produces methane, a greenhouse gas.
4. None of these