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Q#1 Transformers GATE EE 2009 MCQ +2 marks -0.66 marks

The figure below shows coils 1 and 2, with dot markings as shown, having 4000 and 6000 turns respectively. Both the coils have a rated current of 25 A. Coil 1 is excited with single phase, 400 V, 50 Hz supply.

The coils are to be connected to obtain a single phase, 400/1000 V, auto-transformer to drive a load of 10kVA. Which of the options given should be exercised to realize the required auto-transformer?

Connect A and D; Common B

Connect B and D; Common C

Connect A and C; Common B

Connect A and C; Common D

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