F $2030 Pages: 2

070.995 and Ig=10m A. Find ‏جا‎ Ic?

OR
12 Explain the working of LED and photodiode. Draw the necessary figures (10)
ன்‌ wherever applicable.. “
Module 111
13 a) With necessary diagrams, explain the working of a centre-tapped full wave (6)
rectifier. `
0) Compare the ripple factor and efficiency of half-wave, centre-tapped and (4)
bridge rectifiers
OR
14 a) Write the conditions for sustained oscillations. (2)

b) Draw the circuit diagram and explain the working of RC phase shift oscillator. (8)

Write the expression for its oscillation frequency.

Module 1V

15 Explain the generation of various waveforms in a function generator. (10)

OR
16 ൭ Draw the circuit of a non-inverting amplifier and derive the expression for its (7)
voltage gain

b) Design a non-inverting amplifier for a voltage gain of 11 (3)
Module V

17 a) What are the advantages and applications of satellite communication? (5)

b) Explain how the geo-stationary satellite covers full earth? Why are they called (5)

so?
OR
18 With a neat block diagram, explain the principle and working of (10).
superheterodyne receiver.
Module VI

19 a) Describe step-index multimode, step-index single mode and graded index (5)

multimode fibres.

b) Explain cable TV network with its block diagram. (5)
OR
20 Draw and explain functional block diagram of cellular communication system. (10)
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