SSC JE Electrical 16 Nov 2022 Shift 3 Paper

When a rated load with 0.8 lagging power factor is supplied, the terminal voltage of a three phase star connected alternator with a certain interference is 6600 V (line-to-line value). With the same interference, the voltage developed in the open circuit is 7154 V (phase value). What will be the value of voltage regulation of the alternator?