Network Analysis and Synthesis - ECE Questions and Answers

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In an unloaded transformer, the fluxes limiting the primary and secondary are 30 mWb and 20 mWb. The coefficient of coupling is

0.1

0.33

0.67

Answer : Option D

Explanation :

Φ₁₁ = (1 - k) Φ₁ φ₁₁ = φ₁ - φ₂

30 - 20 10 mWb

10 mWb = (1 - k) 30m 0.33 = 1 - k k = 0.67 .

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