Anna Univ EE2203 Electronic Devices and Circuits - Nov / Dec 2013 Important Questions

[Srini]

Anna University

Department of Electrical and Electronics Engineering

Third Semester

EE2203 Electronic Devices and Circuits 

Nov / Dec 2013 Important Questions

(Regulation 2008) 

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Unit 1
1.Draw the circuit diagram and explain the working of full wave bridge rectifier and derive the expression for average output current and rectification efficiency. 
2.With a neat diagram explain the working of a PN junction diode in forward bias and reverse bias and show the effect of temperature on its V-I characteristics.
3.Explain V-I characteristics of Zener diode
4.Derive the diode equation of the diode
5.Explain Zener diode and it’s breakdown mechanism?

Unit 2
1. Sketch neatly the circuit diagram of a CE configuration transistor, discuss its operation, characteristics and compare it with other modes of operation.
2. Derive the hybrid model of a CE Amplifier.
3. What are Power Transistors?
4. Describe the methods of determining h-parameters from its static input and output characteristics.
5. Derive the equation for efficiency of a Class B amplifier

Unit 3
1. Discuss in detail the working and operation of JFET and explain the I/O characteristics 
2. Explain the operation and Characteristics of Enhancement mode MOSFET & Depletion mode MOSFET 
3. Explain how the transconductance of a JFET varies with drain current and gate voltage characteristics and transfer characteristics 
4. In a JFET the following parameters are given, IDDS = 32Ma, VG(off) = -8V and VGS = 4.5 V. Find The values of drain current.
5.Explain the application of FET as a voltage variable resistor

Unit 4
1. Draw the block diagram of a voltage series feedback amplifier and derive the equation for input impedance, output impedance and the voltage gain. 
2. Differentiate oscillator with amplifier 
3. Draw the circuit of a Hartley oscillator and derive the condition for the frequency of oscillation.
4. Explain the working of a differential amplifier in both common and differential mode.
5. Explain the operation of any one type of oscillator in detail and give its equation.  

Unit 5
1. Draw the circuit diagram of a collector coupled astable multivibrator using complementry transistors and draw the typical wave form at base and collector coupled astable multivibrator. 
2. Explain the working and operation of a Schmitt trigger with a neat diagram. 
3. Explain the working and operation of a UJT saw tooth oscillator with a neat diagram.
 4. Explain the working and operation of a Monostable MV with a neat diagram. 
5. Explain the operation of a Bistable MV with a neat sketch.

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