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Q.

A loss free transformer has 500 turns on its primary winding and 2500 in secondary. The meters of the secondary indicate 200 volts at 8 amperes under these conditions. The voltage and current in the primary is

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a

100 V, 16 A

b

40 V, 40 A

c

160 V, 10 A

d

80 V, 20 A

answer is B.

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Detailed Solution

VpVs=NpNs=5002500=15⇒Vp=2005=40 V Also ipVp=isVs⇒ip=isVsVp=8×5=40A
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