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A 5A ammeter can measure a current of upto 1000 A using a _________

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A 5A ammeter can measure a current of upto 1000 A using a _________

(a) 5/1000A C.T.

(b) 1000A C.T.

(c) 5A C.T.

(d) 1000/5A C.T.

This question was addressed to me at a job interview.

This intriguing question comes from Advantages of Instrument Transformers in division Extension of Instrument Ranges of Electrical Measurements

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The correct answer is (d) 1000/5A C.T.

Explanation: A 1000/5A current transformer can be used for measuring a current of upto 1000A by making use of an ammeter with 5A current reading.

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