GATE EE 2026 Set 1 — Question 17
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Electrical Machines → Three-Phase Transformers → Auto-Transformer
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Question
A 15 kVA, 1100 V/220 V, single-phase two-winding transformer is configured as a 1.32 kV/1.1 kV autotransformer.
What will be the rating of the autotransformer?
What will be the rating of the autotransformer?
Correct answer
(C) 90 kVA
Solution
For a two-winding transformer connected as an autotransformer, the power rating increases.
Given:
Two-winding rating kVA
Voltages V, V
Autotransformer voltages kV V, kV VThis configuration implies an additive polarity connection where V.
The rating of the autotransformer is related to the two-winding rating by:
kVA.
Thus, option (C) is correct.
Given:
Two-winding rating kVA
Voltages V, V
Autotransformer voltages kV V, kV VThis configuration implies an additive polarity connection where V.
The rating of the autotransformer is related to the two-winding rating by:
kVA.
Thus, option (C) is correct.
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