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Economics of Power Generation

Economics of Power Generation
In a 3 phase system, the line losses are W at a p. f. Of 1 . If the power factor becomes 0.8 lagging, the losses will becomes

2 W
1.57 W
0.8 W
1.25 W

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Economics of Power Generation
In which?of the following power plants the maintenance cost is usually high?

Hydro-electric power plants
Diesel engine power plants
Nuclear power plant
Thermal power plants

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Economics of Power Generation
Generators for peak load plants are usually designed for maximum efficiency at

25 to 50 % percent full load
25 percent overload
50 to 75 % percent full load
Full load

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Economics of Power Generation
A consumer has to pay lesser fixed charges in

maximum demand tariff
flat rate tariff
two part tariff
any of the above

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Economics of Power Generation
A 130 MW generator is usually ____ cooled.

Oxygen
Nitrogen
Hydrogen
Air

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Economics of Power Generation
When the power factor is unity, the relation between line currnet I and supply voltage V is

I leads V by 90°
None of the listed here
I is in phase with V
I lags V by 90°

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