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Q.

A given AM transmitter develops an un modulated power output of 1 kW across 50Ω  resistance. When a message signal of amplitude 5 V is applied on it. Then the side band carry 40% of power of carrier. Amplitude of carrier signal is

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a

505.95 V

b

126.488 V

c

252.976 V

d

316.22 V

answer is D.

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Detailed Solution

Power of carrier wave , Pc =  Ac22R ⇒Ac22×50=103   ⇒  Ac2=100 × 103  ⇒ Ac=10 x 104=10010=316.22 V
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