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EC 294 / EC9213 – ELECTRONIC DEVICES AND CIRCUITS - April May 2014

Anna University EC 294 / EC9213 – ELECTRONIC DEVICES AND CIRCUITS April May 2014, Computer Science and Engineering, Third Semester, Regulations 2004/2008



Exam
B.E/B.Tech. (Full Time) DEGREE END SEMESTER EXAMINATIONS
Academic Year
April May 2014
Subject Code
EC 294 / EC 9213
Subject Name
Electronic Devices and Circuits
Branch
Computer Science and Engineering
Semester
Third semester
Regulation
2004 and 2008


B.E / B.Tech. (Full Time) DEGREE END SEMESTER EXAMINATIONS, APRIL / MAY 2014
Computer Science and Engineering
Third Semester
EC 294 / EC9213 – ELECTRONIC DEVICES AND CIRCUITS
(Regulations 2004/2008)
Time : 3 Hours                      Answer A L L Questions                Max. Marks 100
PART-A (10 x 2 = 20 Marks)

1. Find voltage across resistor RL in figure 1.

2. Find the curren through resistorRL in figure 2.

3. State superposition theorem.
4. Define power factor.
5. List few applications of diode.
6. What are the operating modes of JFET?
7. What are the features of capacitor filter?
8. Draw the equivalent circuit of CS MOSFET amplifier.
9. What are the ideal characteristics of op-amp?
10. Find the cut-off frequency of low pass filter using op-amp.

Part-B (5* 16 = 80 Marks)
11. i. State Kirchoff’s current and voltage law. (4)
ii. Find the voltage and current through RL in figure 4. (12)
12. a. i. Convert the voltage source given in figure 5 to current source. (4)
ii. Find the Thevenin equivalent circuit for the circuit given in figure 6. (12)
(OR)
b. i . Find the resistance across A and B in the circuit given in figure 7 using delta to Y-Conversion. (8)
ii. For the circuit given in figure 8, find the value of RL for maximum power transfer. (8)

13. a. i. Explain the operation of zener diode voltage regulator. (8)
ii. Draw and explain h parameter model of BJT. (8)
(OR)
b. Explain the drain current flow in depletion mode and enhancement mode MOSFET for various values of Vgs

14. a. Derive the ripple factor, TUF, PIV and efficiency of bridge rectifier with neat circuit diagram and input/output waveforms.
(OR)
b. i. With equivalent circuit diagram, derive gain, input and output impedance of CE amplifier.

15. a. Explain the following op-amp applications.
i. Inverting and non-inverting amplifier (8)
ii. Subtractor (4)
iii. Integrator (4)
(OR)
b. With neat diagram, explain the operation of digital to analog converter.

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