Discussion
A current transformer of ratio 500/5 supplies an ammeter reading 4 A. The primary current is
Answer: D
Correct answer: 400 A
The ratio is \( 500/5 = 100 \), so \[ 4 \times 100 = 400\ \mathrm{A}. \] The secondary reading is multiplied by the ratio, never by the primary rating alone - reading 500 A off a full-scale assumption is the usual error, and the 20 A offered comes from dividing instead of multiplying.
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