Transformer MCQ Part 7

A 220/1100 V transformer takes no load current of 7 A and absorbs 200 W. What is value of magnetizing current:

  1. 4.89 A
  2. 5.89 A
  3. 6.94 A
  4. 7.33 A

Correct answer: 3. 6.94 A

Solution:

Active components of current = IW = W0/V1 = 200/220 = 0.90 A

Magnetizing current = √(Io2 – Iw2) = √(72 – 0.902) = 6.94 A

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