JNTU
JNTU B.Tech III INDUSTRIAL ELECTRONICS Previous Question Paper (August/September - 2024 - R16)
Note: i) Question paper consists of Part A, Part B. ii) Part A is compulsory, which carries 25 marks. In Part A, Answer all questions. iii) In Part B, Answer any one question from each unit. Each question carries 10 marks.
Part A
Define the stabilization.
Answer
Stabilization refers to the process of maintaining the output voltage or current of a power supply or regulator constant despite variations in the input voltage, load current, or ambient temperature. It ensures that the output remains within specified limits, protecting sensitive electronic components from fluctuations and ensuring stable circuit performance.
Write the ideal specifications of Operational Amplifiers.
Answer
The ideal specifications of an operational amplifier are defined by the following characteristics:
- Infinite Open-Loop Voltage Gain: The gain (AOL) is assumed to be infinite, ensuring that the differential input voltage required to produce any output is zero.
- Infinite Input Impedance: The input resistance is infinite, which prevents any current from flowing into the input terminals, thereby avoiding loading effects on the source.
- Zero Output Impedance: The output resistance is zero, allowing the amplifier to act as a perfect voltage source that can drive any load without a drop in output voltage.
- Infinite Bandwidth: The amplifier can amplify signals of all frequencies equally, from DC to infinity, without any phase shift or attenuation.
- Zero Offset Voltage: When the input voltage is zero, the output voltage is exactly zero, meaning there is no inherent DC offset error.
- Infinite Common-Mode Rejection Ratio (CMRR): The amplifier completely rejects any common-mode noise or signals present at both inputs.
What is current boosting?
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Draw the circuit of Series Linear Voltage Regulator.
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Define the peak forward break down voltage.
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List any six different thyristor family devices.
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Draw circuit symbols of TRIAC.
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Write the operation of circuit breaker.
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What is electronic timer?
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List the applications of electrodes.
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Part B
Draw and explain the modes Op-Amp.
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Write a short note on Darlington Emitter Follower and its applications.
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What is meant by differential amplifier? What is the meaning of balanced and unbalanced differential amplifier? Explain.
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Write about the 3-terminal IC voltage regulators.
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Compare the Linear and Switched Mode Voltage Regulators.
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What is the need of protection for voltage regulators? Explain the various protection techniques.
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Explain the principle operation of SCR.
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Explain the triggering of Thyristors.
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Discuss the Classes A, B, C and D Ratings of SCR with suitable circuit diagrams.
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List and explain the various triggering modes of TRIAC.
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Explain briefly how SCR can be used as a switch with suitable diagram.
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Draw and explain the single phase half wave and single phase full wave converters.
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Explain about the digital timers.
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Draw and explain basic circuit for ARC welding.
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Draw and explain the operation of speed regulation of DC motor and also explain the controlling process.
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