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Posted By: cdteja Member Level: Silver Posted Date: 28 Nov 2007
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2005 Jawaharlal Nehru Technological University jntu Question paper
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Code No: NR221802 NR
II B.Tech II Semester Supplementary Examinations,
November/December 2005
BASIC ELECTRONICS
( Common to Metallurgy & Material Technology and Production
Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. (a) With the help of neat diagrams explain the two biasing techniques of a diode.
Draw the V-I characteristics and indicate V
.
(b) Obtain the static and dynamic resistances of the p-n junction germanium
diode, if the temperature is 270 C and Io=1µA for an applied forward bias of
0.2 V. Assume k = 1.38 × 10-23J/0k. [8+8]
2. (a) Explain how the transistor acts as an amplifier.
(b) Define
i. Emitter efficiency
ii. Transport factor
iii. Large signal current gain and
iv. Emitter resistance. [6+10]
3. (a) Draw the block diagram of a general purpose feedback system and prove that,
Af = A
1+A
(b) Draw the schematic block diagram of Oscillator and explain its operation.
[8+8]
4. (a) Classify the timers according to the function and the technique used to achieve
the industrial timing.
(b) List the electronic welding controls used in resistance welding. [8+8]
5. (a) Give the principle of Induction heating. What are the merits of Induction
heating.
(b) Explain the application of Induction heating for
i. surface hardening of steel.
ii. Annealing of brass and iron. [8+8]
6. (a) What is the necessity of time base in cathode ray oscilloscope? Draw any one
type of time base circuits employed in CRO and explain how it produces the
saw-tooth wave
(b) List the applications of C R O. [8+8]
7. (a) What is RVDT? How it different from LVDT? Explain the working principle
of RVDT with neat diagram.
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Code No: NR221802 NR
(b) Explain the concept of parallel plate capacitive transducer. [8+8]
8. (a) What are ultrasonic waves? Give range of wave length of ultrasonic waves in
air, liquids and solids.
(b) Which property of ultrasonic waves made use of them in various applications
(c) Discuss briefly the methods of generation of ultrasonic waves [5+5+6]
? ? ? ? ?
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