MU Electrical Engineering (Semester 3)
Electronics Devices and Circuits
December 2014
Total marks: --
Total time: --
INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary


Answer any four from the following:
1 (a) Explain Zener diode as a voltage regulator.
5 M
1 (b) Explain the construction and principle of operation of photodiode with one application.
5 M
1 (c) Explain thermal stabilization and compensation.
5 M
1 (d) Draw and explain the effect of coupling on performance of BJT amplifiers.
5 M
1 (e) Explain Barkhausen criterion for sustained oscillations.
5 M
1 (f) Draw and explain dual input balanced output differential amplifier using FET.
5 M

2 (a) What are the advantages of negative feedback? Explain.
10 M
2 (b) Explain the operation of LC filter in full wave rectifier with neat diagram and waveforms.
10 M

3 (a) Derive the expression for voltage gain, current gain, input impedance, output impedance of CE amplifier.
10 M
3 (b) What are the types of MOSFET? Explain their construction and working.
10 M

4 (a) Derive an expression for the voltage gain of CS differential amplifier.
10 M

5 (a) What are the different types of feedback amplifier? Explain voltage series negative feedback amplifier.
10 M
5 (b) Draw circuit for R-C phase shift oscillator. Derive an expression for its frequency of oscillation.
10 M

Write short notes on any two of the following:
6 (a) Darlington pair
7 M
6 (b) Wien Bridge oscillator
7 M
6 (c) Frequency response of BJT amplifier.
7 M



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