ANALOG ELECTRONICS PAPER 2

DOWNLOAD ELECTRONICS ENGINEERING PREVIOUS YEARS QUESTION PAPERS B.TECH PTU

ANALOG ELECTRONICS EE 204 B Tech 4th Sem May 2k7
Instructions to Candidates:

1. Section A is compulsory.
2. Attempt any Four questions from Section B
3. Attempt any Two questions from Section C

Section A
( 10 x 2 =20)

1.

1. Why are h-parameters called hybrid parameters?
2. Why is the bypass capacitor used in transistor amplifier?
3. What are the advantages of transformer coupling?
4. Where is direct coupling used?
5. Define half power pints.
6. What is alpha cut-off frequency?
7. What is he difference between positive and negative feedback?
8. Define the unit decibel for expressing voltage, current and power gain.
9. What is the advantage of crystal oscillator?
10. What is a series pass voltage regulator?

Section B
( 4 x 5 =20)
2. Explain how phase reversal of the signal takes place when it is amplified by a single stage voltage amplifier.

3. What is the need of impedance matching in amplifiers? How is it achieved with transformer coupling?

4. Explain why a power amplifier is always preceded by a voltage amplifier.

5. Draw the circuit and explain the working of Colpitts oscillator.

6. Discuss the working of step down switching regulator. Draw the current and voltage waveforms.

Section C
( 2 x 10 =20)

7. Draw the ac equivalent circuit of CE transistor amplifier and derive the expressions for voltage waveform.

8. What are the factors which affect the bandwidth of an RC coupled amplifier? Explain in detail.

9. (a) In a power amplifier the collector circuit efficiency is 15%. Calculate the output power for this circuit if Vcc = 10 V and Ic=20 mA.
(b) How is harmonic distortion reduced in push-pull amplifier?