Calicut University 2005 B.Sc Computer Science Electronic devices and circuits - Question Paper
c4836 2 C 30821
II. Answer any three questions out of five, each carrying 4 marks :
/
r.
1 Draw and explain fullwave and bridge rectifiers,
2 Draw the circuit diagram of a FET amplifier and explain its working.
3 Write notes on LC oscillators with necessary diagram.
5 What is thermal runaway ? How it can be eliminated ?
(3 x 4 = 12 marks)
III. Answer any on question out of 2 carrying 7 marks
1 Explain the working of a RC phase shift oscillator and derive the expression for frequency of oscillations.
2 What is clamping ? Draw and explain the following clamping circuits,
(a) Clamper clamping + ve!y t OV.
(b) Clamper clamping -vely at +3V.
(1x7 = 7 marks)
c 4836 Name......................................
Reg.
SECOND YEAR B.Sc. DEGREE EXAMINATION, MARCH/APRIL 2005
Part IIISubsidiary Paper IELECTRONIC DEVICES AND CIRCUITS (Improvement)
Time : Three Hours Maximum : 60 Marks
Answer five questions, choosing not more than three from each part.
All questions carry equal marks.
Part A
1. (a) Brief the theory behind the insulators and conductors.
(b) Describe about the step junction aJd graded junction of a PN junction diode.
2. (a) Describe about the current distribution in a Bipolar Junction Transistor.
(b) Describe the performance of Zener liiode and Varactor diode.
3. (a) Describe the small signal model of! BJT.
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4. (a) Describe the performance of UJT
(b) Explain briefly about transferred electron devices.
Part B
1. (a) Draw the circuit diagram of a full-wave rectifier with L section filter and explain its operation, (b) Compare the performance of BJT amplifier and FET amplifier.
2. (a) Draw the hybrid equivalent circuit of a BJT common emitter configuration amplifier, and
(b) With a circuit diagram, explain the operation of an emitter follower.
3. (a) Draw the circuit diagram of a RC phase-shift oscillator and explain its operation.
(b) Describe the characteristics of negative feedback amplifier.
4. (a) Draw the circuit diagram of a class A power amplifier and explain.
(b) With a neat circuit diagram, explain the operation of a bistable multivibrator.
Attachment: |
Earning: Approval pending. |