In amplitude modulation,

  • A
    both amplitude and frequency do not change according to information signal.
  • B
    amplitude remains constant but frequency changes according to information signal.
  • C
    both amplitude and frequency change according to information signal.
  • D
    amplitude of carrier wave changes according to information signal.

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Similar Questions

$A$ message signal of frequency $10 kHz$ and peak voltage of $15 V$ is used to modulate a carrier frequency of $1 MHz$ and peak voltage of $30 V$. Determine the modulation index.

Basically,the product modulator is

Match Column $A$ (layers in the ionosphere for skywave propagation) with Column $B$ (their height range).
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$IV$. $65-75 \ km$

Consider telecommunication through optical fibres. Which of the following statements is $NOT$ true?

For sky wave propagation of a $10\, MHz$ signal, what should be the minimum electron density in the ionosphere?

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