Class 12

32. Communication System question bank (Physics)

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Q1.

$A$ transmitter supplies $9 \,kW$ to the aerial when unmodulated. The power radiated when modulated to $40\%$ is........$kW$

(A)
$5$
(B)
$9.72$
(C)
$10$
(D)
$12$
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Q2.

The antenna current of an $AM$ transmitter is $8 \ A$ when only the carrier is sent,but it increases to $8.96 \ A$ when the carrier is modulated by a sine wave. The percentage of modulation is: (in $\%$)

(A)
$50$
(B)
$60$
(C)
$65$
(D)
$71$
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