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

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Economics of Power Generation
Annual depreciation as per straight line method, is calculated by

increasing a uniform sum of money per annum at stipulated rate of interest
the capital cost minus the salvage value, is divided by the number of years of life
None of these
the capital cost divided by number of year of life

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