JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech II ELECTRONIC CIRCUITS Previous Question Paper (December - 2017 - R13)
Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit.
Part A
Classify negative feedback amplifiers.
Answer
Negative feedback amplifiers are classified based on the method of sampling and mixing: 1) Voltage-Series, 2) Voltage-Shunt, 3) Current-Series, and 4) Current-Shunt feedback.
Classify amplifiers.
Answer
Amplifiers are classified based on: 1) Input signals (Small signal vs Large signal), 2) Frequency range (Audio, RF, Video), 3) Coupling method (RC, Transformer, Direct), 4) Operating point (Class A, B, AB, C), and 5) Feedback (Positive, Negative).
Calculate the power gain in decibels if Po = 100 mW, Pi = 5 mW.
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Demonstrate the effect of the Miller effect capacitance.
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Draw the transfer characteristics of positive clipper circuit.
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Compare all types of multivibrators.
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Give the classification of Power Amplifiers.
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Compare and Contrast the Voltage and Power Amplifiers.
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What is the difference between diode switch and transistor switch?
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Illustrate the piece-wise linear Diode characteristics.
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Part B
Draw the circuit diagram and equivalent circuit of CB amplifier using h-parameters derive the expression for current gain, voltage gain, input resistance and output resistance.
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Enumerate the effects of negative feedback on the various characteristics of the amplifier.
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Assess the effect of coupling and bypass capacitors on the low frequency response of FET amplifier.
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What factors define 3-dB cutoff point at the high-frequency end of BJT amplifier? Assess their effect on high-frequency response of BJT amplifier.
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Derive the expressions for UTP and LTP of Schmitt Trigger.
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What is mean by triggering? Give any one triggering circuit.
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Design the positive and negative peak clampers circuits and then explain their operation with the help of input and output waveforms.
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Draw the circuit diagram of an emitter-coupled clipping circuit and draw its transfer characteristics.
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Discuss the principle operation of Transformer coupled Class-B push pull Amplifier with the help of circuit diagram and then prove that its maximum conversion efficiency is 78.5%.
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Describe the response of a Low-Pass RC circuit for step input with necessary equations and waveforms.
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When high pass circuit acts as differentiator? Derive its condition.
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Explain the phenomenon of “Latching” in a transistor switch.
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Discuss the storage and transition switch times of a diode.
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Discuss the terms pertaining to Transistor Switching characteristics: i) Rise Time ii) Delay Time iii) Turn-On Time iv) Storage Time v) Fall Time and vi) Turn-Off Time.
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Explain how transistor saturation parameters vary with temperature.
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