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Statement for Linked Answer Questions 57 and 58:
The figure above 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 10 kVA. 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
Correct answer: Connect A and C; Common B
Solution
Connecting A and C with Common B allows for the proper transformation ratio needed to achieve the desired output voltage of 1000 V from the 400 V input, utilizing the turns ratio effectively between the two coils.
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