STUPIDSID
1 (a)
What do you mean by "Communication"? Describe in detail Communication system with the help of block-diagram.
7 M
1 (b)
State and prove following properties of Fourier Transform
1. Duality
2.Frequency Shifting
3.Convolution in time domain.
1. Duality
2.Frequency Shifting
3.Convolution in time domain.
7 M
2 (a)
Explain the signal to noise ratio [SNR] of an amplifier and effect of amplification on the SNR.
7 M
Answer any two question from Q2 (b) or Q2 (c)
2 (b)
Explain the following:
Shot noise, Partition noise, Flicker noise, Burst noise, Avalanche noise, Bipolar transistor Noise, Field effect transistor noise.
Shot noise, Partition noise, Flicker noise, Burst noise, Avalanche noise, Bipolar transistor Noise, Field effect transistor noise.
7 M
2 (c)
Draw the circuit diagram of high frequency transformer and derive the equation for transfer impedances.
7 M
Answer any two question from Q3 (a), (b) or Q3 (c), (d)
3 (a)
Draw the AM wave forms for less than 100%, with 100%, more than 100% and with 0% modulation. Assume that the modulating signal is a pure sine wave. And compare the wave forms. How to achieve this?
7 M
3 (b)
Explain electronically tuned radio receivers. The carrier amplitude after AM varies between 4 volts and 1 volt. Calculate depth of modulation.
7 M
3 (c)
Explain operation of an envelope detector circuit. Explain the importance of RC time constants for the envelope detector circuit. Also state and explain various distortions encountered in the envelope detector.
7 M
3 (d)
A coil has a series resistance of 10Ω, a self-capacitance of 28 pF and an inductance of 2μH. Determine the effective inductance and effective Q-factor when coil forms part of series tuned circuits resonant at 12 Mhz.
7 M
Answer any two question from Q4 (a), (b) or Q4 (c), (d)
4 (a)
Define and explain energy spectral density (ESD).Obtain the Fourier transform of a unit step function.
7 M
4 (b)
Explain: "Skin effect."
7 M
4 (c)
Write a short note on: A.G.C. (Automatic Gain Control).
7 M
4 (d)
A 20 MHz carrier is modulated by a 300 Hz audio sine wave, If the carrier voltage is 5 volt and the maximum deviation is 12 kHz, Write the equation of this modulated wave for :(A) F. M. (B) P.M.
7 M
Answer any two question from Q5 (a), (b) or Q5 (c), (d)
5 (a)
State and explain Kepler's laws in relation to artificial satellites orbiting the earth. Differentiate between geosynchronous and geostationary satellite orbits.
7 M
5 (b)
What do you mean by "tracking" in a super heterodyne receiver? What is "tracking error"? Explain the "three point tracking" in MW band receiver.
7 M
5 (c)
What is Transponder? Explain various Transponders.
7 M
5 (d)
What do you mean by altitude control? Explain Multiple-access methods with diagram.
7 M
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