Question

A single-phase 400V/200V transformer is supplying a load of 4 kW at 200 volts, 0.9 power factor lagging. Considering the transformer to be ideal, answer the following questions

The output (secondary) current of this transformer

20.00/_25.84 A

20.00/_-25.84 A

22.22/_-25.84 A

22.22/_25.84 A

12.83/_-25.84 A

12.83/_23.28 A

Load impedance in ohms.

8.10+j3.92

9.00-j4.36

3.62-j1.47

9.00+j4.36

4.50+j2.18

8.10-j3.92

The primary current

10.00/_25.84 A

10.00/_-25.84 A

40.00/_-25.84 A

44.44/_-25.84 A

11.11/_25.84 A

11.11/_-25.84 A

The load impedance referred to the primary in ohms

36.00+j17.44

32.40+j15.69

18.00+j8.72

16.2+j7.85

2.03+j0.98

2.25+j1.09

When transformer is loaded from no load to full load, the flux in the core

increases

decreases

remains the same.

can increase or decrease depending on the load power factor.