JNTU
JNTU B.Tech III INDUSTRIAL ELECTRONICS Previous Question Paper (May - 2019 - R16)
Part A is compulsory. Part B consists of 5 Units. Answer any one full question from each unit.
PART - A
Write the need of differential amplifiers.
Answer
Differential amplifiers are needed to amplify the difference between two input signals while rejecting common-mode signals such as noise or interference. They provide high common-mode rejection ratio (CMRR) and are essential as input stages for operational amplifiers and instrumentation circuits.
Write the ideal specifications of operational amplifiers.
Answer
The ideal specifications of an operational amplifier include: infinite open-loop gain, infinite input impedance, zero output impedance, infinite bandwidth, infinite common-mode rejection ratio (CMRR), and zero offset voltage/current.
Write the applications of servo voltage stabilizer.
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Explain the role of current boosting in voltage regulators.
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Write the applications of class A power amplifiers.
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Draw and label characteristics of SCR.
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Write the protection of SCR.
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Explain about the static circuit breaker.
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Name the different type of timers.
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What is meant by the term welding?
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PART - B
Explain in detail about Darlington Emitter Follower.
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What are the advantages of differential amplifiers over normal common Emitter amplifier?
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Explain the DC amplifier using emitter follower as the 1st stage and derive the expression for its gain using its equivalent circuit.
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How is short-circuit current protection provided for an IC regulator? Draw and explain the circuit diagram.
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Explain about a voltage regulator circuit using LM 105 IC with an external pass transistor.
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What are the advantages of a current limiting circuit?
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Discuss briefly the different components of power loss that occur in a thyristor during its working. Which of the power loss components are dominant at power frequencies and which are dominant at high frequencies?
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Draw and explain the waveforms of trigger pulse voltage and output voltage.
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Explain how SCR is used in triggering of thyristors.
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Explain different triggering modes of Triac and give comparison among them.
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Discuss in detail about Firing Circuits.
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Discuss about the following:
- Single transistor chopper
- Two transistor chopper.
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Explain the theory and principle of dielectric heating.
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List various Industrial applications of dielectric heating.
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Write the merits and applications of High frequency heating.
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Define the terms plastic welding and fusion welding.
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