Q1. What is modulation? Why modulation is required?

This is question 1 (3 marks) from the GTU Electronic and Communication BE Summer 2021 question paper. Subject code: 2151004.

Q2. Compare AM, FM and PM.

This is question 2 (3 marks) from the GTU Electronic and Communication BE Summer 2021 question paper. Subject code: 2151004.

Electronic and Communication | B.E. Semester V Summer 2021 | GTU Papers

Q: Q1. Explain different types of noise related to communication.

This is question 1 (4 marks) from the GTU Electronic and Communication BE Summer 2021 question paper. Subject code: 2151004.

Q: Q1. Draw the general block diagram of a super heterodyne receiver and briefly explain the function of each block.

This is question 1 (7 marks) from the GTU Electronic and Communication BE Summer 2021 question paper. Subject code: 2151004.

Q: Q2. Discuss block diagram of filter method for SSB-SC generation.

This is question 2 (4 marks) from the GTU Electronic and Communication BE Summer 2021 question paper. Subject code: 2151004.

Q: Q2. Explain Armstrong method of FM generation with neat diagram

This is question 2 (7 marks) from the GTU Electronic and Communication BE Summer 2021 question paper. Subject code: 2151004.

Q: Q2. Explain Amplitude modulation with required waveforms. Also give mathematical representation of amplitude modulated wave.

This is question 2 (7 marks) from the GTU Electronic and Communication BE Summer 2021 question paper. Subject code: 2151004.

Q: Q3. Explain pre-emphasis and de-emphasis in relation to FM

This is question 3 (3 marks) from the GTU Electronic and Communication BE Summer 2021 question paper. Subject code: 2151004.

Q: Q3. Draw the waveforms at input and output of envelop detector.

This is question 3 (4 marks) from the GTU Electronic and Communication BE Summer 2021 question paper. Subject code: 2151004.

Q: Q3. Explain the indirect method of generating FM signal with neat block diagram and relevant mathematical expressions

This is question 3 (7 marks) from the GTU Electronic and Communication BE Summer 2021 question paper. Subject code: 2151004.

Questions26

What is modulation? Why modulation is required?

[3 marks]

Explain different types of noise related to communication.

[4 marks]

Draw the general block diagram of a super heterodyne receiver and briefly explain the function of each block.

[7 marks]

Compare AM, FM and PM.

[3 marks]

Discuss block diagram of filter method for SSB-SC generation.

[4 marks]

Explain Armstrong method of FM generation with neat diagram

[7 marks]

Explain Amplitude modulation with required waveforms. Also give mathematical representation of amplitude modulated wave.

[7 marks]

Explain pre-emphasis and de-emphasis in relation to FM

[3 marks]

Draw the waveforms at input and output of envelop detector.

[4 marks]

Explain the indirect method of generating FM signal with neat block diagram and relevant mathematical expressions

[7 marks]

Explain use of frequency multiplier and mixing for FM generation.

[3 marks]

Explain any one method for generation of SSB signals in detail.

[4 marks]

An FM wave is given by e(t) = 20sin(6*108t + 7sin1250t). Determine (i) carrier frequency (ii) modulating frequency (iii) modulation index and (iv) maximum deviation

[7 marks]

What are the advantages of delayed AGC.

[3 marks]

state and prove the Time shifting properties of Fourier transform.

[4 marks]

Draw the general block diagram of a communication system and briefly explain the function of each block.

[7 marks]

Define the following terms related with radio receiver:

[3 marks]

selectivity (ii) fidelity (iii) sensitivity

[ marks]

Explain self-capacitance of a coil.

[4 marks]

Two resistors 20 kΩ and 50 kΩ are at room temperature (290K) for a bandwidth of 100kHz.Calculate thermal noise for each resistor, if two resistors are in series and if two resistors are in parallel.1

[7 marks]

What do you mean by image frequency in radio receiver?

[3 marks]

Express an equation for impedance of series tuned circuit in terms of quality factor?

[4 marks]

Find overall noise figure of three stage cascaded amplifier, each stage having a power gain of 10 dB and noise figure of 4 dB.

[7 marks]

Define shot noise.

[3 marks]

An AM broadcast receiver has an IF of 455 KHz and is tuned to 1400 KHz and the RF stage has one tuned circuit with a Qof 150. (a) Find the image frequency; (b) Find the image rejection in decibels.

[4 marks]

Determine the Friis’s formula to define noise factor of amplifiers in cascade.

[7 marks]

Electronic and Communication — Summer 2021

Questions26