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Posted Date: 04 May 2009 Posted By: ravikanth Member Level: Diamond
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2007 Jawaharlal Nehru Technological University Electronics and Control Systems IV B.Tech.(I-Semester) Examinations INDUSTRIAL ELECTRONICS Question paper
Code No.OR129402
IV B.Tech.(I-Semester) Examinations August 2007
INDUSTRIAL ELECTRONICS(Electronics and Control Systems)
Time: 3 hours Max.Marks:80
Answer any FIVE questions
All questions carry equal Marks
1.a) Draw the circuit of series voltage regulator and explain its operation.
b) Explain how the short-circuit overload protection is performed in a series voltage regulator.
2.a) Eddy currents are effectively used in Industrial applications. Describe the technique and mention those applications.
b) What are the merits of Induction Heating?
3.a) Explain capacitor turn-off circuits operation for an SCR.
b) Explain the two transistor model of an SCR.
4.a) What is a chopper? Explain series chopper and series-shunt chopper operation with neat circuits.
b) Describe the operation and applications of Diac.
5.a) Derive the expression for d.c current of a Half wave controlled rectifier.
b) Explain the method to trigger SCR by UJT.
6.a) Draw the basic circuit of a differential amplifier and explain its operation.
b) What is the need for Drift compensation? Explain two Drift compensation techniques.
7.a) What is the need for timing circuits in Industrial applications? Explain the operation of a timing circuit.
b) Describe different types of welding.
8. Write short notes on any Three:
a) Switching mode voltage regulator
b) Static circuit breaker
b) Inverters
c) Ultrasonic generation and applications
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