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1832120042 Pages: 2

. Define total internal reflection. What is the approximate value of core and cladding
diameter of OFC?
Name any four applications of CCTV.
PART B
Answer ANY 8 Questions. Each question carries 5 Marks.
. With the help of necessary diagram, explain carbon composition resistor and carbon

film resistor.

Explain the basic principles of contactors and relays with the help of neat schematics.
With the help of diagrams, explain the principle of operation of npn transistor. What is
the current gain of common emitter transistor? What is the relationship
between a and B?

Explain the constructional details of LED and Solar Cell. Explain the working of each.
Briefly explain the working of Zener voltage regulator. Discuss the line regulation of a
Zener voltage regulator.

Draw the circuit and explain the working of RC coupled common emitter amplifier. Plot
its frequency response showing the cut off frequencies.
Explain the structure and operation of n type and p type semiconductor.

Define CMRR and slew rate of Op-Amp. Derive the expression for the gain of
inverting and non-inverting amplifier using Op-Amp.

Draw the block diagram and explain the working of a function generator.

Construct XOR gate and XNOR gate using any one type of the universal gates only.
PART C

Answer ANY 4 Questions. Each question carries 5 Marks.
What is communication satellite and explain the operation of satellite communication

system? Write any two application of satellite communication system.

What is modulation? Differentiate between amplitude modulation and frequency
modulation. Define frequency deviation of FM.

Draw the block diagram of FM super heterodyne receiver and explain the working.
Explain the operation of cellular mobile communication system. Explain the steps
involved in a typical call connection between two mobile users.

Draw the block diagram of optical communication system and explain. Write any two
applications of optical communication system.

. Draw the block diagram and explain the working of a cable TV system.

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