Calicut University 2007 B.Sc Computer Science Electronic devices and circuits - Question Paper
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FIRST YEAR B,Sc. DEGREE EXAMINATION, MARCH/APRIL 2006
Part IIIElectronics Paper IELECTRONIC DEVICES AND CIRCUITS Time.; Three Hours Maximum: 50 Marks
Part A
I, Answer any three questions :
1 What is step junction ?
2 Define extrinsic semiconductors.
3 Define transconductance of JFET.
4 Draw the equivalent circuit of a UJT.
5 Express the ripple factor of a full wave rectifier with capacitor filter.
(3 x 2 6 marks)
II. Answer any three questions : , -
6 Differentiate between conductors and insulators with examples.
7 Explain zener breakdown.
8 Briefly explain the operation of a TRAP ATT diode.
_ _ 9 Name the h parameters of a CE transistor cocfiguration.
10 Define cut in voltage of a diode.
(3 x 4 = 12 marks)
III. Answer any one question :
11 Explain the structure of -channel depletion mode and enchancement mode MOSFET.
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12 Explain the structure and wc rking of a UJT. Also explain the negative resistance characteristic.
! (1x7 = 7 marks)
Part B
IV. Answer any three questions :
13 Define ripple factor.
14 What is emitter follower ?
15 What is positive feedback ?
16 Express the frequency'of oscillation of a Wien bridge Oscillator.
(3x2 = 6 marks)
Turn over
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V. Answer any three questions : .
17 What the need for biasing in transistor amplifiers ?
18 Draw the circuit of a class A amplifier.
19 Explain a differentiator circuit with necessary circuits.
20 Draw the circuit of a Hartley Oscillator and label the relevant parts.
21 Draw a CE amplifier circuit. Explain its working briefly.
(3 x 4 s 12 marks)
VI. Answer any one question :
22 Explain the operation of an RC coupled amplifier with circuit diagram.
23 Explain the operation of an astable multivibrator with circuit diagram.
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| Earning: Approval pending. |
