Q. 34.5( 45 Votes )

Answer question numbers 3(a) - 3(d) on the basis of your understanding of the following paragraph and the related studied concepts.

Renewable energy sources such as wind energy are vital for the Indian economy, not only from the point of view of supply, but also from the perspective of environmental and social benefits.

India is the world’s fifth largest wind-power producer and the largest

windmill facilities in India are installed in Tamil Nadu. Muppandal is a small village of Tamil Nadu and one of the most important sites of wind-farm in the state.



It uses wind from the Arabian Sea to produce renewable energy. The suitability of Muppandal as a site for wind farms stems from its geographical location as it has access to the seasonal monsoon winds.

The electrical generators used on wind turbines in sites like Muppandal, produce an output AC of 240 V and a frequency of 50 Hz even when the wind speed is fluctuating. A transformer may be required to increase or decrease the voltage so it is compatible with

the end usage, distribution or transmission voltage, depending on the type of interconnection.

(a) State the principle behind electric generator.

(b) The output frequency of wind turbine is 50 Hz. What is meant by this statement?

(c) Why do you think Muppandal is at an advantageous position for this project?

(d) Based on the data represented in the graph below, which of the two cities A or B would be an ideal location for establishing a wind-farm and why?



Answer :

(a) Generators generate electrical power based on the principle of Faraday's law of electromagnetic induction.


This law states that-


When a conductor moves in a magnetic field it cuts magnetic lines of force, which induces an electromagnetic force (EMF) in the conductor which cuts the magnetic field lines.


(b) Output frequency of wind turbine is 50Hz which means that the frequency of voltage generated by the wind turbine is 50Hz even when the wind is of fluctuating form.


(c) Muppandal in Tamil Nadu has access to Monsoon winds which is a good source to drive wind turbines, and hence its suitable for this project.


(d) Here city B has maximum wind speed up to 140Km/H, but it’s of highly fluctuating in nature.


On the other hand, the fluctuation in wind speed of city A is less, the average is maintained near 100Km/H


Hence, city A is suitable for this project.


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