A 15 KVA, 2400/240 V, 1-o transformer has an equivalent resistance and reactance, both referred to the primary side, of Req = 2.5 2 and Xeq = 4.5 92, respectively. The core loss is 80 W. The transformer delivers rated kVA to a load at rated secondary voltage and 0.9 power factor lagging. a. Determine the voltage applied to the primary side. b. Determine the percent voltage regulation. C. Find the efficiency of the transformer.