JED (10) - 3001 Reg. No.........

(REVISION - 2010) Signature

SECOND SEMESTER DIPLOMA EXAMINATION IN ENGINEERING/

TECHNOLOGY - OCTOBER, 2016

BASIC ELECTRONICS .

(Common for EL, EC, EA, EP, CT. CM, IF, AE, TC, BM and MD)

lTime :3 hours

(Ma<imum marks: 100)

PART - A

(Maximum marks: l0)

I Answer the following questions in one or two sentences. Each question canies

2 marks.

l. What is meant by capacitance ? What is the unit of capacitance ?

2. Draw the energJ band diagram of a semiconductor.

3. What is an exninsic semiconductor ?

4. Write the value of PIV for a centre tapped full wave rectifier.

5. Draw the equivalent circuit of UJT. (5x2=10)

PART - B

(Modmum marks: 30)

II Answer orry, five of the following questions. Each question carries 6 marks.

. L Explain the operation of a fransformer.

2. Define nansition capacitance and difffrsion capacitance.

3. Show that efficiency of a firll wave rectifier is 81.2% :

4. Explain majority and minority carrien with suitable examples.

5. Describe the working of a full wave voltage doubler.

6. With neat figure explain combinational clipper.

7. List the application of UJT. (5x6=30)

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2

PART - C

Maximum marks: 60)

(Answer one fiil question from each unit. Each fi.ilI question carries 15 marks.)

UNrr - I

(a) Briefly explain diffferent types of capacitors.

(b) List the applications of chip resiston.

On

(a) Write the colotr codes used in resistors with necessary examples.

(b) Explain the charging and discharging action of a capacitor.

UNrr - Itr

(a) Describe the forward and reverse Vl characteristics of a junction diode.

(b) Explain the working of varactor diode.

On

(a) How tree electrons are created in n-type semi conductor material.

(b) Explain zener diode as.a voltage regulator.

UNtr - III

(a) Explain full wave cenfte tapped rectifier with filter circuit and waveforms.

(b) List the different types of filter circuits.

On

(a) Compare half wave, full wave centre tapped and bridge rectifiers-

(b) Describe the operation of positive and negative clamper.

UNtr - IV

Explain the input and output characteristics of an npn tansiSor in common base

configuration.

On

(a) Discirss the operation of a pnp tansistor.

(b) Explain UJT characteristic ctrve.

t0

5

IV

VII

VIII

D(

l0

5

8

7

l0

5

7

8

15

7

8

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