Anna University Chennai 2005 B.E Mechanical Engineering /B.TECH : Electronics Engineering - Question Paper

B.E/B.TECH. DEGREE exam ,NOV/DEC 2005
2nd semester, Mechanical engineering
Electronics Engineering


Time:3 Hrs
Maximum: 100 marks


PART A (10 X two =20)



1.What do you mean by Maximum power rating in diode?

2. describe forbidden energy gap.

3. compute IE in a transistor for which ß = 50 and IB = 20 µ A

4. elaborate the applications of common base amplifiers?

5. Draw the 2 transistor analogy of SCR

6. Write applications of UJT

7. State the ideal charecteristics of an op-amp

8. Write the advantages and disadvantages of Wein Bridge oscillator

9. Convert A8H to Radix five and Radix 2

10. State Demorgans theorem.


PART B ( five X 16 =80)

11. Draw and discuss full wave bridge rectifier and list its advantages and disadvantages

12(a) (i) discuss the performance measures of transistor amplifier

(ii) The maximum power dissipation of a transistor is 100 mW if Vce = 20 V .What is the maximum collector current that can be allowed without distruction of the transistor?

OR

(b) discuss

(i) Voltage divider bias

(ii) Base rectifier method of biasing

13 (a) (i) discuss JFET working principle and draw output charectistics

(ii) What is the difference ranging from JFET and BJT.

OR

(b) (i)Sketch the V-I charecteristics of a triac

(ii) Draw the equivalent circuit of a UJT and explain its working.

14 (a) Write short note on Op-amp based

(i) Adder

(ii) Multiplier

(iii) Integrator

(iv)Differentiator

OR

(b) Draw and discuss RC phase shifter oscillator and cal;culate the frequency of oscillations if R1= R2 = R3 =1 M ohms and C1 = C2= C3 = 68 pF.

15 (a) discuss half adder and full adder

OR

(b) With diagram discuss A/D conversion technique.

Earning:   Approval pending.