Calicut University 2007 B.Sc Computer Science SECOND YEAR , ch-il- - Question Paper

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²    C 16496

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.

C 30821    (Pages 2)    Name.....................................

Reg. No.......................~.........

FIRST YEAR B.Sc. DEGREE EXAMINATION, MARCH/APRIL 200*7

Part IIISubsidiary-Electronics Paper IELECTRONIC DEVICES AND CIRCUITS Time: Three Hours    Maximum : 60 Marks

Part A

I, Answer any three questions out of five, each carrying 2 marks :

1    Define electronics.

2    Explain a tunnel diode with necessary diagram,

3    Which are the different types of biasing a PN junction ?

4    Define doping. What is its significance ?

5    What are majority and minority carriers in a semiconductor.

(3 * 2 = 6 marks)

II. Answer any three questions out of five, each carrying 4 marks

1    Explain the CE configuration of a BJT with its input and output characteristics.

2    Write notes on LED, with its applications.

3    Define semiconductors. Explain intrinsic and extrinsic semiconductors with examples,

4r Define the JFET parameters and give the relation between them.

5 What is enhancement MOSFET ? Draw and explain the drain and transfer characteristics of enhancement MOSFET.

(3 x 4 = 12 marks)

III. Answer any one question out of two, carrying 7 marks :

1    Explain the different configurations of BJT with necessary diagrams and compare their performance.

2    Explain a UJT with its structure, symbol, device characteristics and applications.

(1x7 = 7 marks)

Part B

I. Answer any three questions our of 5 each carrying 2 marks :

1    Define ripple factor. -

2    Differentiate halfivave and full wave rectifier.

3    What is the Barkhausen criteria for osillators ?

4    Draw the hybrid equivalent circuit of a CE amplifier.

5    Draw the circuit of an astable multivibrator and its output waveform.

(3x2 = 6 marks) Turn over

Attachment: calicut-university-2007-b-sc-computer-science-31732-1.jpg calicut-university-2007-b-sc-computer-science-31732-2.jpg

Earning:   Approval pending.