Attempt any four of the following:

1 (a)
What is double spotting?

5 M

1 (b)
Explain Eye pattern in detail

5 M

1 (c)
Explain under water acoustic channel

5 M

1 (d)
Explain low level modulated AM transmitter

5 M

1 (e)
Compare FDM and TDM

5 M

2 (a)
State and prove sampling theorem for low pass band limited signal

8 M

2 (b)
Explain balanced modulator using FETs

6 M

2 (c)
In an AM radio receiver the loaded Q of the antenna circuit at the input to the mixer is 100. If the intermediate frequency is 455 KHz, calculate the image frequency and its rejection at 1 MHz.

6 M

3 (a)
Explain what is meant by quantization noise. Explain in detail.

8 M

3 (b)
Find the mathematical expression of FM Signal

6 M

3 (c)
Draw block diagram of BPSK generation with waveform

6 M

4 (a)
Calculate the maximum bitrate for a channel having BW 3100 Hz and signal to noise ration 10db.

4 M

4 (b)
State and prove the following properties of Fourier transform

(i) Time Shifting

(ii) Convolution in time domain

(i) Time Shifting

(ii) Convolution in time domain

8 M

4 (c)
Explain the term:

(i) Shot noise and equivalent noise temperature

(ii) Friis transmission formula

(i) Shot noise and equivalent noise temperature

(ii) Friis transmission formula

8 M

5 (a)
Draw and explain PCM-TDM system

10 M

5 (b)
What are the disadvantages of tune RF receiver? Draw the circuit of a superheterodyne receiver and explain the same.

10 M

6 (a)
Draw neat block diagram of delta modulator and explain its working. What are the draw backs of delta modulator? How are they overcome by ADM?

8 M

Write Short notes on:

6 (b) (i)
Noise Triangle

3 M

6 (b) (ii)
Pre-emphasis and De-emphasis

3 M

6 (b) (iii)
White noise

3 M

6 (b) (iv)
Properties of line codes.

3 M

More question papers from Principles of Analog & Digital Comm.