Kerala University 2006-2nd Sem B.Tech Production Engineering Combined first and - exam paper

COMBINED 1st AND 2nd SEMESTER B-TECH DEGREE examination
MAY/JUNE 2006
(2003 scheme)
BASIC ELECTRONICS ENGINEERING

PART - A
ans all ques.. every ques. carries four marks

1.Explain the construction of a multilayer inductor.

2.Describe the effect of temperature on conductivity of an intrinsic semiconductor.

3.Explain the pinch-off condition in a JFET.

4.A centre tapped full wave rectifier has the subsequent specifications:
Secondary voltage of transformer is 6-0-6V
Forward resistance of every diode =20ohm
Load resistance=1K ohm
compute RMS value of output voltage and current.

5.How will you fix the operating point on the output characteristics of a CE amplifier?

6.Draw the symbol of an Exclusive- OR gate. discuss its working with the help of truth table. How this can be used as an inverter.

7.Explain briefly 1)Virtual height
2)Critical frequency

8.Mention the applications of RADAR ?

9.What is freguency reuse in mobile communication? discuss.

10.What are the parts in an optical fibre? Draw the cross part of a fibre.

PART - B
ans any 2 ques. from every module.Each ques. carries 10 marks.

MODULE 1
11.What are the kinds of carbon resistors? discuss the construction of thin film and thick film resistors.

12.With the help of VI characteristics, discuss the working of a zener diode.

13.Compare CE, CB and CC - configurations of a transistor in terms of voltage gain, current gain, input and output resistance.

MODULE 2

14.How many amplifiers are classified with reference to load line? discuss the function of every component of an RC coupled amplifier.

15. a) Derive the voltage gain of a non-inverting amplifier using OP-AMP.
b) In an inverting amplifier using OPAMP, Rf = 500K ohm, R1 = 125 K ohm,Vi = 2V. obtain the output voltage.

16.With the help of a neat sketch, discuss the working of a moving coil loud speaker.

MODULE 3

17. a)What is the need for modulation?
b)Draw the waveform of an FM signal.

18.Draw the block diagram of a pulsed radar and discuss. Write radar range formula.

19.Write notes on
a)Microwave repeater
b)Basic principles of cellular communication.

Earning:   Approval pending.