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4
MCQ (Single Correct Answer)

A speech signal of 3 kHz is used to modulate a carrier signal of frequency 1 MHz , using amplitude modulation. The frequencies of the side bands will be

A
1.003 MHz and 0.997 MHz
B
3001 kHz and 2997 kHz
C
1003 kHz and 1000 kHz
D
1 MHz and 0.997 MHz
5
MCQ (Single Correct Answer)

A message signal of frequency $\omega_m$ is superposed on a carrier wave of frequency $\omega_c$ to get an Amplitude Modulated Wave (AM). The frequency of the AM wave will be

A
$\omega_m$
B
$\omega_c$
C
$\frac{\omega_c+\omega_m}{2}$
D
$\frac{\omega_c-\omega_m}{2}$
6
MCQ (Single Correct Answer)

I-V characteristics of four devices are shown in figure.

Identify devices that can be used for modulation

A
(i) and (iii)
B
only (iii)
C
(ii) and some regions of (iv)
D
All the devices can be used
7
MCQ (Single Correct Answer)

A male voice after modulation-transmission sounds like that of a female to the receiver. The problem is due to

A
poor selection of modulation index (selected $0< m< 1$ )
B
poor bandwidth selection of amplifiers
C
poor selection of carrier frequency
D
loss of energy in transmission.
8
MCQ (Single Correct Answer)

A basic communication system consists of

A. transmitter. B. information source. C. user of information. D. channel. E. receiver.

Choose the correct sequence in which these are arranged in a basic communication system.

A
ABCDE
B
BADEC
C
BDACE
D
BEADC
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