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Posted By: kondapalli Member Level: Gold Posted Date: 05 May 2008
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2007 Jawaharlal Nehru Technological University B.Tech Mechanical Engineering BASIC ELECTRONICS Question paper
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1. (a) Distinguish avalanche break down and zener break down
(b) Give the expressions for ripple factor for Half Wave rectifier with
i. Inductor filter and
ii. Capacitor filter. Compare the performance of the two filters with load
variation. [8+8]
2. (a) Draw a simple transistor amplifier circuit and explain the working of it.
(b) Draw the equivalent diagram of SCR with two transistors and hence explain
the operation of SCR. [8+8]
3. (a) CE configuration is supposed to be versatile configuration among the three
configurations. Give reasons. What is the special feature of CC configuration?
(b) Define positive feed back. What is the relation between Af (gain with feed
back) and A(gain without feed back). [10+6]
4. (a) Draw the circuit and explain the operation of Magnetic energy storage welder
(b) What are the types of resistance welding and explain each of them. [8+8]
5. (a) Explain the theory of induction heating by taking an example of cylindrical
metal piece. Draw the Graph showing the variation of eddy current density
with distance from the metal surface
(b) Discuss different types of losses observed in dielectric heating. [10+6]
6. (a) Explain the working and construction of a CRT with neat sketch. Give the
detailed description of all parts in a CRT.
(b) What is a time base? State the need for time base in CRO. [8+8]
7. (a) Explain with necessary sketch how bellows are used to measure the pressure.
(b) List out the advantages and disadvantages of Thermistor and Thermocouple.
[8+8]
8. (a) Explain Piezo-electric effect in crystals.
(b) Explain the method of generating ultra sonic waves using Piezo- electric gen-
erator.
(c) Explain the application of ultrasonic waves in dispersing metals. [5+5+6]
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