A transformer changes 12V to 18000V and there are 6000 turns in secondary coil. The number of turns in primary coil are:
Correct answer: D. 4
- A. 40
- B. 20
- C. 30
- D. 4
Explanation
4: If there are 4 turns in the primary coil, the voltage transformation ratio would be 6000/4 = 1500, which matches the given transformation ratio of 12V to 18000V. Therefore, the correct answer is "4" as the number of turns in the primary coil of the transformer is 4.
This question appeared on the ETEA MDCAT 2009 paper, which you can sit online with every answer explained.
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About Transformers
Transformers transfer alternating electrical energy between coils by mutual induction, with voltage ratio determined by the turns ratio. The topic covers step-up and step-down transformers, current changes, ideal power conservation and practical losses such as heating and flux leakage. A transformer requires changing magnetic flux, so it does not operate with steady direct current.
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