Section B Answer ANY THREE questions in this section. Each question carries 20 marks. B1. An electrical engineer tested

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Section B Answer Any Three Questions In This Section Each Question Carries 20 Marks B1 An Electrical Engineer Tested 1 (119.03 KiB) Viewed 18 times

Section B Answer ANY THREE questions in this section. Each question carries 20 marks. B1. An electrical engineer tested a 2 kVA, 230/115 V single-phase transformer, and the test results are given in Table B1. Voltage Current Power 230 V 0.45 A 30 W Open circuit test (Low voltage side open-circuited) Short circuit test (Low voltage side short-circuited) 13.2 V 6.0 A 20.1 W Table B1 By using an approximate equivalent circuit, evaluate (a) the equivalent circuit of the transformer referred to high voltage side, (7 marks) (b) the equivalent circuit of the transformer referred to low voltage side, (4 marks) (0) the voltage regulation at rated load and power factor of 0.8 lagging. (6 marks) and (d) the efficiency of the transformer in part (c). (3 marks)