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Posted By: Sra1 Member Level: Diamond Posted Date: 28 May 2008
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2007 Jawaharlal Nehru Technological University B.Tech Electronics COMMUNICATION ENGINEERING (Supplimentary Examinations, November 2007) Question paper
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Set No 1
-----------------
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
1. (a) Explain with the help of sketches and mathematical expressions how VSB
modulation can be obtained and mention its applications.
(b) An AM broadcast station has a modulation index, which is 0.75 on the aveage. What would be the average power saving if it could go over to SSB-SC transmission, while having to maintain the same signal strength in the reception area? [10+6]
2. (a) Explain the indirect method of FM generation.
(b) A 500Hz modulating voltage fed into a PM generator produces a frequency deviation of 2.25kHz. What is the modulation index if the amplitude of the modulating voltage is kept constant but its frequency is raised to 6kHz? What is the new deviation? [8+8]
3. (a) Explain the operation of ISB transmitter with block diagram. Where it is used?
(b) What is the function of crystal filters in SSB transmitter?
(c) State and explain with respect to ‘Q’, various types of filters used to separate side bands? [4+6+6]
4. (a) With reference to an AM superheterodyne receiver explain the need for AGC and indicate simple method of obtaining it. What is delayed AGC circuit and in what respects it differs from a simple AGC circuit.
(b) Explain the measurement of sensitivity, selectivity and fidelity of receiver. [8+8]
5. (a) Define noise figure and derive the expression for the overall noise figure of Cas-
caded linear networks, in terms of network parameters F1,
N
n1,
G1; F2,
N
n2,
G2,
etc.,
(b) Draw an experimental set up to measure the Noise figure of a system and explain. [10+6]
6. (a) What is Pulse Modulation? Classify pulse modulation systems.
(b) State and explain Sampling Theorem. [8+8]
7. Draw the block diagram of DPSK transmitter and receiver and explain the operation. [16]
8. Discriminate between the reset and restart error recovery procedures used in the packet layer of X.25 and explain their operation. [16]
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