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Q#1 Instrument Transformer GATE EE 2006 MCQ +2 marks -0.66 marks

A 200/1 current transformer (CT) is wound with 200 turns on the secondary on a toroidal core.  When it carries a current of 160 A on the primary, the ratio and phase errors of the CT are found to be -0.5% and 30 minutes respectively.  If the number of secondary turns is reduced by 1 the new ratio error (%) and phase error (min) will be respectively

0.0, 30

−0.5, 35

−1.0, 30

−1.0, 25

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