Transformer MCQ Part 5

A 220/1100 V transformer takes no load current of 5 A and absorbs 200 W. What is no load power factor:

1. 0.074 lag
2. 0.181 lag
3. 0.256 lag
4. 0.384 lag

Correct answer: 2. 0.181 lag

Solution:

No load PF (Cosφ) = W_o/(V₁.I_o) = 200/(220*5) = 0.181 lag