The transformer connection given in the figure is part of a balanced 3-phase circuit where the phase sequence is "abc". The primary to secondary turns ratio is 2:1. If $(I_a + I_b + I_c = 0)$, then the relationship between $I_A$ and $I_{ad}$ will be

$|I_A| / |I_{ad}| = 1 / (2\sqrt{3})$ and $I_{ad}$ lags $I_A$ by $30^\circ$.

$|I_A| / |I_{ad}| = 1 / (2\sqrt{3})$ and $I_{ad}$ leads $I_A$ by $30^\circ$.

$|I_A| / |I_{ad}| = 2\sqrt{3}$ and $I_{ad}$ lags $I_A$ by $30^\circ$.

$|I_A| / |I_{ad}| = 2\sqrt{3}$ and $I_{ad}$ leads $I_A$ by $30^\circ$.

GATE 2025 Electrical Engineering Q43 — Electrical Engineering

GATE 2025Set MasterQ43MCQanswer keyexplanation soonhard

Electrical Engineering · Transformers

Concept intelligence

Drill mode: Phase Sequence · 1/3

Figure from the original GATE 2025 paper. (IIT Roorkee archive)

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Recurring concept

Transformers has appeared in GATE Electrical Engineering 61 times across 28 years (2021, 2023, 2024, 2025, 2026, ...).