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ESE(IES) 2016-Communication Systems Test

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Question 1

A sinusoidal signal with a random phase is given by x(t) = A sin [π/2-(2πft+θ)] with the probability density function

What is the maximum amplitude of the autocorrelation function of this signal?

Question 2

When a radio receiver is tuned to 555 kHz, its local oscillator provides the mixer with an input at 1010 kHz. At the output, another signal is also received along with the desired signal. What is the frequency of the other station?
What is the frequency of the other station?

Question 3

An AM voltage signal s(t) with a carrier frequency of 1.15 GHz has a complex envelope g(t)=Ac[1+m(t)] Ac=500V, and the modulation is a 1 KHz sinusoidal test tone described by m(t) = 0.8 sin, appears across a 50 resistive load. What is the actual power dissipated in the load?

Question 4

Which one of the following signals can be applied to a delta modulator whose step size is 0.1 v and sampling frequency is 20 kHz so that no slope overload occurs?

Question 5

Match List-i (Coding Technique in Digital Communication Systems) with List-ii (Purpose) and select the correct answer using the code given below the lists:
A- Huffman code
B- Error correcting code
C- NRZ-coding
D- Delta modulation
1. Elimination of redundancy
2. Reduces bit rate
3. Adapts the transmitted signal to the line
4. Channel coding

Question 6

Assertion (A): In television transmission, interlaced scanning is used.
Reason (R): Interlaced scanning provides increased picture brightness.

Question 7

A digital communication system uses 8-PSK modulation and transmits 3600 bps. What is the symbol rate?

Question 8

For a 10-bit PCM system, the signal to quantization noise ratio is 62 dB. If the number of bits is increased by 2, then how would the signal to quantization noise ratio change?

Question 9

If the turn on and turn off energy losses in a transmitter are 51 mJ and 76.8 mJ respectively and the mean power loss is limited to 200 W, what is the maximum switching rate that can be achieved?

Question 10

A conventional telephone line with 3 kHz bandwidth and having 30 dB signal-to-noise ratios can carry information at a rate
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