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GATE EC : Communications Champion Quiz 2

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Question 1

Weak components of a signal with non-flat psd can be protected against channel noise and frequency dependent channel response by a pair of spectral operations. These components can be amplified before transmission and attenuated after reception leading to both flat end-to-end channel response and higher SNR. What are the names of these operations

Question 2

What would be the bandwidth of the output signal of SSB-AM (USB) modulator illustrated below when the bandwidth of the baseband message signal is 3 kHz and c(t) = 2sin(200 * 10³ πt).

Question 3

For a message signal

and carrier of frequency f_c, which of the following represents a signal side band (SSB) signal?

Question 4

Find the correct match between group 1 and group 2.

Question 5

The Column-l lists the attributes and the Column-2 lists the modulation systems. Match the attribute to the modulation system that best meets it.
Column-l
P. Power efficient transmission of signals
Q. Most bandwidth efficient transmission of voice signals
R. Simplest receiver structure
S. Bandwidth efficient transmission of signals with
significant dc component

CoIumn-2
I. Conventional AM
II. FM
III. VSB
IV. SSB-SC

Question 6

A Hilbert transformer is a

Question 7

The signal

Question 8

A device with input x(t) and output y(t) is characterized by: y(t) = x²(t). An FM signal with frequency deviation of 90 kHz and modulating signal bandwidth of 5 kHz is applied to this device. The bandwidth of the output signal is

Question 9

Find the power of the signal whose spectrum is given below.

Question 10

Choose correct matching
(1). FM
(2). Companding
(3). Mixer
(4). Foster Seely discriminator
p) increase strength of region of low strength signal
q) frequency conversion
r) demodulation of FM
s) capture effect

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ESE & GATE EC Communications

Jun 7ESE & GATE EC