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Solution for Live Quiz Session: Analog Communication-01 Feb 2018

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Question 1

A deterministic signal V(t) is assumed to be similar to a random signal X(t), having zero mean and variance $Description: Description: 08_Analog-Comm_BL-done_files\image004.png$ . The variance of V(t) is given by

Question 2

12 signal each band-limited to 5 KHz are to be transmitted over a single channel by freq. division multiplexing. If AM-SSNB modulated guard band of 1 KHz is used, then the bandwidth of the multiplexed signal will be

Question 3

A 70 kHz bandwidth is to accommodate 7 AM broadcast signals simultaneously. The maximum modulation frequency must each station be limited to _____ kHz. Assume that a guard band of 5 kHz is also present.

Question 4

In an angle modulated signal, the modulated frequency is increased from 15kHz to 30 kHz. If the signal is frequency modulated, the modulated signal bandwidth is

Question 5

A carrier frequency modulated with a sinusoidal signal of frequency 4 kHz resulting in a maximum frequency deviation of 7kHz. The bandwidth of modulated signal is

Question 6

In a DSB system the carrier is c(t) = A cos 2πfc(t) and the message signal is given by
m(t) = sinc(t) +sinc²(t)
The bandwidth of the modulated signal is_______(Hz)

Question 7

In SSB modulation system, if signal (cos 30t) is modulated with a carrier signal of frequency 850 rad /sec, then the expression for the lower side band is

Question 8

The amplitude of a sinusoidal carrier is modulated by a single sinusoid to obtain the amplitude modulated signal

The value of the modulation index is _______.

Question 9

Let X(F) and Y(E) denote the fourier transformation of x(+) and y(+) respectively. The ideal HPf has the cut-off freq. 10 KHz. The positive freq. where Y(E) has spectral peak are

Question 10

A message signal shown in below figure is applied to the AM modulator with modulation index 62%. If m(t) is a periodic signal then the modulation efficiency is

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ESE & GATE EC Communications

Aug 21ESE & GATE EC