Question

A large coal-fired power station producers 2000 MW of electrical energy. A wind turbine with 33 m blades can produces 300 kW.; (a) How many turbines would be needed to replace the power station?; (b) Why, in actual practice, this number of turbines could not replace the coal-fired power station?

Answer 1

Explanation:

As per the question,

GIven data are:

Electrical energy produced by power station = 2000 MW

(As we know $1 \ MW = 10^{6} \ W$ )

∴ Electrical energy produced = $2000 \times 10^{6} \ W$

Power = 300 kW = $300 \times 10^{3} \ W$

(1 kW = 1000 W)

Number of turbines blade = 33

(a) Number of turbines needed to replace the power station:

$Number \ of \ turbines \ =\frac {2000 \times 10^{6}}{300 \times 10^{3}}$

                                               = 6666.66

∴ Number of turbines needed to replace the power station = 6667

(b) In actual practice, this no. of wind turbines could not replace the coal-fired power plant because the efficiency of wind turbines keeps changing due to changes in wind speed but the efficiency of steam turbines used in coal-fired power stations remains the same.

Answer 2

Answer:

6667

Explanation:

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