Annamalai University 2009-1st Year B.Sc Electronics - Dual system - Electronic science - - - Semiconductor devices and electronic circuits - Question Paper

B.Sc. DEGREE exam – 2009
(DUAL DEGREE SYSTEM)
(ELECTRONIC SCIENCE)
(FIRST YEAR)
(PART-III – PAPER - II)
540. Semiconductor devices and electronic circuits
May) (Time: three Hours
Maximum: 100 Marks
part – A
ans any 5 ques..
All ques. carry equal marks. (5 x four = 20)
1.What is SCR? discuss its structure.
2.Define active region, cut-off region and saturation region of a C.E transistor.
3.Give the construction and working of a CMOS.
4.Explain the characteristics of the negative feed back.
5.What is a Class A power amplifier? discuss its efficiency.
6.Give the equivalent circuit of a crystal when it is used as oscillator.
7.What is CMMR of an operational amplifier? How is it measured?
8.Explain the concept of virtual ground.
part – B
ans any 5 ques..
All ques. carry equal marks. (5 x 16 = 80)
9.Describe the construction, working and the characteristics of a PIN diode.
10.What is Zemer diode? discuss its volt-ampere characteristics? How is it used as a voltage regulator?
11.Give the construction of a JFET. How are the drain and transfer characteristics obtained? discuss.
12.Explain the principle of feed back. Draw the circuit of an emitter follower and find an expression for its gain.
13.How does a Class B push-pull amplifier work? find an expression for its power consumption. Show that in a push-pull circuit all the even harmonic terms are balanced.
14.Draw the circuit diagram of a Hartley oscillator and discuss its working. find an expression for frequency of oscillations.
15.Draw the circuit of a (i) investing amplifier and (ii) Non-investing amplifier. find on express for its gain.
16.How is an operational amplifier used as an (i) integrator and (ii) differentiation? discuss with necessary theory.

Earning:   Approval pending.