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Posted Date: 30 Jan 2009 Posted By: ritu Member Level: Gold
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2006 Jawaharlal Nehru Technological University Code No: RR IV B.Tech II Semester Regular Examinations, Apr/May 2006 INDUSTRIAL ELECTRONICS Question paper
Code No: RR421003 Set No. 4
IV B.Tech II Semester Regular Examinations, Apr/May 2006
INDUSTRIAL ELECTRONICS
( Common to Electronics & Instrumentation Engineering and Mechatronics)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. (a) Explain about Residual drift in D.C amplifiers.
(b) Explain how it can be compensated. [8+8]
2. (a) Explain the methods of decreasing input regulation factor (Sv) for a series
Voltage Regulator.
(b) Define
i. input regulation factor
ii. output resistance
iii. temperature coefficient of a Voltage Regulator. And derive an expression
to relate them. [8+8]
3. (a) Draw the circuit of monolithic regulator connected as a current regulator and
explain it. Also obtain the expression for its load current.
(b) Differentiate between the monolithic and hybrid integrated circuits. [8+8]
4. (a) List the advantages of thyristor as compared to BJT for switching applications.
(b) An SCR has a V
g -I
g characteristics given as V
g = 1.5 + 8 I
g . In a certain
application, the gate voltage consists of rectangular pulses of 12 V and of
duration 50microsec with the duty cycle 0.2. Find the value of R
g series
resistor in gate circuit to limit the peak power dissipation in the gate to 5
watts. And also calculate average power dissipation in the gate.
(c) Define the Nonrepetitive and Repetitive peak reverse and forward voltage
ratings of SCR. [6+6+4]
5. Explain the operation of a single-phase , half-controlled bridge converter with resis-
tive load with the associated waveforms and also derive the expressions for average
load voltage , average load current and RMS load voltage. [16]
6. Design a snubber circuit and explain its operation and give its applications. [16]
7. Explain the SCR sequential flasher used for automobile turn signals. [16]
8. (a) Explain the coagulating action of Ultrasonics.
(b) Explain the chemical ,thermal and biological effects of Ultrasonics.
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