Discussion
A current transformer has 400 secondary turns and a single primary turn. Its nominal ratio for a five ampere secondary is
Answer: C
Correct answer: 2000/5
A current transformer is a step-up in turns and a step-down in current, so 400 secondary turns against a single primary turn gives a current ratio of 400 to 1. With 5 A in the secondary the primary carries \( 400\times5 = 2000 \) A, and the nominal ratio is written 2000/5. Reading the turns count as the primary rating gives the 400/5 offered.
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