Which of the following is NOT a reason for wh | vedclass

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(B) Modulation is primarily used for three reasons: $1$. To reduce the size of the antenna: An antenna size should be of the order of $\lambda/4$. For

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To reduce the time interval between the transmitter and the receiver.

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(B) Modulation is primarily used for three reasons: $1$. To reduce the size of the antenna: An antenna size should be of the order of $\lambda/4$. For low-frequency audio signals,$\lambda$ is very large,requiring an impractically large antenna. Modulation shifts the signal to a higher frequency,reducing $\lambda$ and thus the antenna size. $2$. To reduce the fractional bandwidth: The ratio of signal bandwidth to carrier frequency is reduced,which makes the design of the antenna and the tuning circuit easier. $3$. To allow for multiplexing: By modulating different signals to different carrier frequencies,multiple signals can be transmitted simultaneously over the same channel. Option $B$ is incorrect because modulation does not reduce the time interval (propagation delay) between the transmitter and receiver; this is determined by the speed of the signal (usually the speed of light) and the distance between them.

Column $A$	Column $B$
$A$. $D$-layer	$I$. $250-400 \ km$
$B$. $E$-layer	$II$. $170-190 \ km$
$C$. $F_1$-layer	$III$. $95-120 \ km$
$D$. $F_2$-layer	$IV$. $65-75 \ km$

Which of the following is $NOT$ a reason for why we need modulation in communication systems?

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In amplitude modulation,the amplitude of the carrier wave is $A_c$ and that of the modulating signal is $A_m$. In practice,the ratio of $A_m$ to $A_c$ is kept less than or equal to $1$ to avoid:

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