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. What are the major light detectors used in optical fiber communication system.
. Why scanning and synchronizing is required in TV systems.
. What is the need for cell splitting in cellular system?

PART B

Answer any 8 complete questions each having 5 marks

Discuss the construction, working and application of an electro-mechanical relay.

On what basis the capacitors are classified? List the different types of capacitors and discuss
the operation of a variable capacitor?

Analyze the common emitter configuration of the transistor and derive the relation between a
and 0.

. Draw and explain the experimental setup for obtaining the forward and reverse characteristics
of a diode and plot the approximate graphs for silicon and germanium diodes.

Differentiate intrinsic and extrinsic semiconductors and discuss the formation of PN junction.
With neat circuit diagram and waveforms explain the working of a centre tapped full wave
rectifier with capacitor filter.

Draw and explain the block diagram of a public address system.

What are oscillators? List the types and principle involved. Explain the working of any one
oscillator with circuit diagram.

Draw the circuit and explain the working of a non-inverting amplifier with op-amp and obtain
the expression for its closed loop gain.

Draw the block diagram of a digital storage oscilloscope and specify the functions of each
block.

Answer any 4 complete questions each having 5 marks

Draw the block diagram of AM receiver and explain the functions of each block with
waveforms.

What is GPS? Explain how GPS tracks the position?

Explain with a block schematic of the transponder used in satellite and list the band of
frequencies used for different applications.

How does a GSM network connect people around? Describe the sequence of operations and
components involved.

Explain optical communication with the help of block diagram and list the merits and demerits.

Describe a typical HDTV system with block diagram.

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