Solar Thermal Power Plant

Q. Energy can neither be generated nor destroyed. It can only be converted from one form to another.

1. mirrors are used to reflect sunlight on the the cooker thus more heat.

2. mirrors absorb more sunlight falling on the cooker thus more heat.

Q. Explain the functioning of solar water heater. what are it's disadvantages?

Q.

Mention two limitations of making use of solar cell panels to meet our domestic needs.

Q.

Principle of solar cooking

Q. Name the type of mirror used in a solar furnace so that high temperature can be achieved by this device. (Concave, Convex)

Q. State whether true or false :
Water flows in a solar water heater due to the pressure difference between two ends of copper tube.

1. True
2. False

Q. Match the following parts of a solar thermal power plant with their functions.

1. heats the water
2. condenses the steam
3. rotates when steam passes through
4. converts mechanical energy to electricity

Q.

$1$ kWh = ___________ J.

Q. A 2 kW heater, a 200 W TV and three 100 W lamps are all switched on from 6 p.m. to 10 p.m. What is the total cost at Rs. 5.50 per kWh ?

Q. Solar water heater can be used in hospitals for hot water supply.

1. True
2. False
3. Ambiguous
4. Data insufficient

Q.

The domestic use of solar cells is limited due to ________.

Q. Fossil fuels are energy rich compounds of an element X which were originally made by the plants with the help of sun's energy.
(a) Name the clement K
(b) Name another element which is usually found in combination with X in fossil fuels.

Q. How can solar energy be harnessed? Mention any two limitationsin using solar energy. How are these limitations overcome?

Q.

What kind of reflectors are used in solar thermal power plant?

1. Convex

2. Concave

3. Plane

4. Plano convex

Q. Reflectors are used in solar heating devices to concentrate the sun heat.

1. True
2. False

Q. In order to absorb more heat, the outer surface of copper tube of solar water heater is coloured with :

1. Red
2. Yellow
3. Black
4. Green

Q. Two identical immersion heaters are to be used to heat water, in a large container. Which one of the following arrangement would heat the water faster :
Give reasons for your answer.

1. Connecting the heaters in series with the main supply,
2. Connecting the heaters in parallel with the main supply,
3. Connecting the heaters in series and parallel with the main supply,
4. None of the above

Q. Explain with diagram step-by-step energy conversion in a Solar thermal power plant.

Q. Sort the following units according to the process flow in solar thermal power plant to generate electricity:

1. Reflectors
2. Heat absorber
3. Turbine
4. Generator

Q. Observe the figure. Discuss and record how hot water is formed in the tank of solar heater.