Equivalent Circuit in Single-Phase Transformer - MCQs with Answers

Equivalent Circuit in Single-Phase Transformer - MCQs with Answers


Q1. For a transformer, no load primary current ( I0 ) has two components, magnetizing component and active components. The magnetizing component is given by

a. I0 cos Φ0
b. I0 sin Φ0
c. I0 cot Φ0
d. I0 tan Φ0

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ANSWER: b. I0 sin Φ0



Q2. For a certain transformer if E1 is the emf across primary winding, E2 is the emf across secondary winding and K is the ratio of secondary to primary turns. The value of secondary emf referred to the primary side is

a. E2 / K
b. E2 / K ∧ 2
c. K * E2
d. K ∧ 2 * E2

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ANSWER: a. E2 / K



Q3. In transformers for maximum voltage regulation to occur, the power factor and magnitude is

a. Lagging, Zpu
b. Leading, Zpu
c. Unity, Zpu
d. None of these

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ANSWER: a. Lagging, Zpu


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