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Principle of Communications Question Paper - May 18 - Information Technology (Semester 3) - Mumbai University (MU)
written 4.9 years ago by gravatar for teamques10 teamques10 ★ 64k
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written 4.9 years ago by gravatar for teamques10 teamques10 ★ 64k

Principle of Communications - May 18

Information Technology (Semester 3)

Total marks: 80
Total time: 3 Hours INSTRUCTIONS
(1) Question 1 is compulsory.
(2) Attempt any three from the remaining questions.
(3) Draw neat diagrams wherever necessary.

Write any four of the following.

1.a. Explain pre-emphasis & de-emphasis.
(5 marks) 00

1.b. Explain shot noise & transit time noise in brief.
(5 marks) 00

1.c. State drawbacks of delta modulation system & how it is removed.
(5 marks) 00

1.d. Explain principles of Sky wave propagation in brief.
(5 marks) 00

1.e. State and prove differentiation property in time domain of Fourier transform.
(5 marks) 00

2.a. Explain PWM generation & degeneration method in detail.
(10 marks) 00

2.b. Explain PCM Encoder & PCM decoder with block diagram.
(10 marks) 00

3.a. A sinusoidal carrier has an amplitude of 10 V & a frequency of 100 KHz. It is amplitude Modulated by a sinusoidal voltage of amplitude 3 V & a frequency of 500 Hz. Modulated Voltage is developed across 75 $\Omega$ .

  1. Write the equation of modulated wave.
  2. Determine modulation index
  3. Calculate total average power
  4. Power carried by side-bands
  5. Spectrum of modulated wave

(10 marks) 00

3.b. Explain in detail indirect method of generation of FM with suitable diagram.
(10 marks) 00

4.a. What is multiplexing in communication system? Draw and explain transmitter and Receiver of FDM.
(10 marks) 00

4.b. Explain with reference to AM receiver

  1. Fidelity
  2. Selectivity
  3. Sensitivity
  4. Image frequency and its rejection.
  5. Double spotting

(10 marks) 00

5.a. Draw the ASK, FSK & PSK waveforms for digital data 11010011.
(6 marks) 00

5.b. What do you mean by inter symbol interference & how it is avoided.
(8 marks) 00

5.c. What do you mean international standards for communication system? How frequencies are allocated?
(6 marks) 00

Write short notes on (any four)

6.a Friss formula.
(5 marks) 00

6.b. Sampling theorem.
(5 marks) 00

6.c. Lines codes.
(5 marks) 00

6.d. Types of communication channel.
(5 marks) 00

6.e. Space wave propagation.
(5 marks) 00

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