Jawaharlal Nehru Technological University Hyderabad
Jawaharlal Nehru Technological University Hyderabad B.Tech II ELECTRONIC CIRCUITS Previous Question Paper (April/May - 2018 - R16)
Note: Part A is compulsory (25 Marks). Part B consists of 5 Units. Answer any one full question from each unit (10 Marks each).
Part A
Answer all questions:
Define the Difference amplifiers and write their use.
Answer
Explain the characteristics of a CB amplifier.
Answer
- Low input impedance and high output impedance.
- Current gain less than unity (approximately 1).
- High voltage gain.
- Non-inverting output (output is in phase with the input).
- Excellent high-frequency response due to the absence of the Miller effect, making it suitable for high-frequency applications.
Compare negative feedback and positive feedback and their uses.
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Mention the requirements for amplitude Stability of Oscillators.
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Write about the cross over distortion in power amplifiers circuit.
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Why even harmonics are cancelled out in Push Pull Amplifiers.
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What are the constituents of signal Comparators?
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State the Clamping Circuit Theorem.
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Write the importance of time base circuits and their use.
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Explain the operation of a diode as a switch.
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Part B
Mention the significance of Gain-Bandwidth product of amplifiers. An amplifier consists of 3 identical stages in cascade. The bandwidth of overall amplifier extends from 20 Hz to 20 kHz. Calculate the bandwidth of individual stage.
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Discuss the classification of amplifiers, and for a single stage CE amplifier with RS = 1K, R1 = 50 K, R2 = 2K, RC = 1K, RL = 1.2K, hfe = 50, hie = 1.1K, hre = hoe = 0; Find AI, Ri, Ro, AV and power gain.
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Discuss the classification of amplifiers based on feedback and write the Effect of Feedback on Amplifier characteristics.
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Discuss the operation of Wein Bridge oscillator and derive the expression for the frequency of oscillations.
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Discuss the drawback of class B amplifier and how do you overcome using Class AB amplifier.
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Write a short note on Thermal Runway.
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Discuss the operation of Transformer Coupled class-A Amplifier with a diagram.
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Mention the importance of the position of operating point on output signal swing in class A amplifier and prove that its conversion efficiency is 25%.
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Sketch the response of RC High pass circuit for exponential input and Ramp input and derive the output equations for the above inputs.
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Explain the operation of a negative peak clamper circuit with its diagram.
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Distinguish between the Diode Clippers and Transistor Clippers with their merits.
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Describe the switching times of BJT by considering the charge distribution across the base region. Explain this for cut off, active and saturation regions.
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Differentiate the principle of operation of a mono-stable Multivibrator and derive an expression for pulse width of it.
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