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GATE 2015 EE – Question 33

Electrical and Electronic Measurements · Instrument transformers, Digital voltmeters and multi-meters, Phase, Time and Frequency measurement · 1 mark · Multiple choice

The primary mmf is least affected by the secondary terminal conditions in a

  1. power transformer.
  2. potential transformer.
  3. current transformer.
  4. distribution transformer.

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Show answer and explanation

Correct answer: (C) current transformer.

Explanation

In a current transformer the primary carries the line current, which is fixed by the power system and not by the secondary burden. So the primary mmf is the least affected by what is connected to the secondary.