Kerala University B.Tech Computer Science Third Semester Electronics Circuits Previous Questions 2008 Scheme

Third Semester B.Tech. Degree Examination,December 2012

(2008 Scheme)

08.304:ELECTRONICS CIRCUITS(RF)

PART-A

Answer all questions

1. Explain the working principle of SMPS.
2. Analyse full wave rectifier(with centre tapped transformer) and find out ripple factor and TUF.
3. Explain the working of an inverter.
4. Determine V0 for the netwok shown:

   

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   5.Explain the working of Wien bridge oscillator.

   6.Explain the operation of a astable multivibration using 555 timer IC.

   7.Explain the working of colpitts oscillator.

   8.Find VCEQ for the collector to base bias circuit with VCE=12v,RB=680KΩ ,Rc=4.7K and β=100.

   9.Draw the circuit of a differential amplifier using OPAMP.

   10.Calculate the output of an inverting amplifier with R1=100K,Rf=220K and Vin=1v.

   PART-B

   Answer any one question from each Module

   Module-I

   11.a) Design and analyze a full wave bridge rectifier with RC filter.

        b) A full wave bridge rectifier with a 120Vrms sinusoidal input has a load resistor of 1 KΩ .

           i)if silicon diodes are used,wahat is the dc voltage available at the load?

          ii) Determines the required PIV rating of each diode.

          iii) Find the maximum current through each diode during conduction.

                            OR

   12.a) What is the response of a passive RC low pass filter to a sinusoidal waveform?

        b) Explain different types of clampers.

                                                                  

   Module-II

   13.a) Explain the voltage divider bias circuit for common emitter configuration and obtain expressions for IB and VCE.

         b) Determine the dc level of IB and Vc for the network shown in Figure-1.

   

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   14.a)Derive the expression for voltage gain in emitter follower configuration.

        b) Explain the working of RC phase shift oscillator.

   Module-III

   15.a) Describe the working principle of an ideal OPAMP.What are the applications of OPAMPS?

        b)Realize a II order active low pass filter using OPAMP.

   OR

   16.Explain summing,differential,inverting and noninverting amplifier configuration using OPAMP.