Five bulbs of 20 W each are connected to the electrical system of a room. If only three bulbs are being used at a time, determine the demand factor.

If a power system has a total demand of 1000 MW and a required spinning reserve of 10%, what should be the total available generation capacity?

A power system network with a base capacity of 100 MVA has a source impedance of 10% (0.1 p.u.) at a given point. The short-circuit fault level at that point is: