Electronics and Communication Technology (May – 2016) [IDOL - Revised Course | Question Paper]

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B.Sc.IT: Semester – I

[Electronics and Communication Technology]

Question Paper (May – 2016) [Revised Course]

Time: 3 Hours
Total Marks: 100

N.B.:    (1) All Questions from 1 to 7 are Compulsory.
             (2) Figure To right indicate the marks.

Q.1 Attempt Both The Question: (10 Marks)
(A) Derive the equation for total power used in transmitting amplitude modulated wave.
(B) Discuss the operation of a semiconductor diode in reverse bias.

Q.2 Attempt Any Three From The Following: (15 Marks)
(A) With the help of neat circuit diagram and proper input output waveforms, explain the working of Full Wave Rectifier using pn Junction Diode.
(B) What is an Extrinsic Semiconductor? Explain P-Type Semiconductors.
(C) Draw the input characteristics of a Transistor connected in CE configuration and explain the various Regions of Operation.
(D) Explain how a Transistor can be used as a Switch.

Q.3 Attempt Any Three From The Following: (15 Marks)
(A) What do you mean Darlington Pair?
(B) Write a short note on DC Amplifiers.
(C) Explain the following terms: – 
      (i) Voltage Gain
      (ii) Current Amplification Factor
      (iii) With the help Circuit Diagram explain Single Stage RC Coupled Amplifier.

Q.4 Attempt Any Three From The Following: (15 Marks)
(A) Explain Barkhausen Criteria for Oscillators.
(B) With the help of circuit diagram explain monostable multivibrator using 555 timer.
(C) With the help of circuit diagram explain RC phase shift oscillator.
(D) Calculate the time period of astable multivibrator, if R_A=33 KΩ,R_B=4.7 KΩ and C=O.22 μF.

Q.5 Attempt Any Three From The Following: (15 Marks)
(A) Explain a typical radio transmitter system using block diagram.
(B) Explain generation of SSB using filter method.
(C) What is the need for modulation in communication system?
(D) Explain the following terms: i) Balanced modulator ii) Modulation index

Q.6 Attempt Any Three From The Following: (15 Marks)
(A) Differentiate between AM and FM systems.
(B) What do you mean by sampling? State and explain sampling theorem.
(C) Write a note on pulse width modulation (PWM).
(D) Explain Frequency Division Multiplexing in detail.

Q.7 Attempt Any Three From The Following: (15 Marks)
(A) What is Digital Communication? Explain FSK in detail.
(B) With the help of a suitable diagram, explain the propagation of Light in Optical Fibers.
(C) Write a short note on LASER.
(D) Explain the following terms: – 
      (i) Critical Angle
      (ii) Optical Detectors

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