GATE Electrical Engineering (EE) 2015 Shift 1 Solved Paper

A 200/400 V, 50 Hz, two – winding transformer is rated at 20 kVA. Its windings are connected as an auto-transformer of rating 200/600 V. A resistance load of 12 Ω is connected to the high voltage (600 V) side of the auto-transformer. The value of equivalent load resistance (in Ohm) as seen from low voltage side is_______