JNTU
JNTU B.Tech III ELECTRONIC INSTRUMENTATION Previous Question Paper (May - 2018 - R15)
Note: This question paper contains two parts A and B. 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. Each question carries 10 marks and may have a, b, c as sub questions.
Part A
What is the function of automatic network Analyzers? State the principle of operation.
Answer
Automatic network analyzers are used to measure the scattering parameters (S-parameters) of electrical networks across a wide frequency range. Their principle of operation involves injecting a known stimulus signal into the device under test (DUT) and using a vector receiver to measure the magnitude and phase of the reflected and transmitted signals relative to the incident signal.
What is the direct way to measure loop gain in a circuit?
Answer
The direct way to measure loop gain is to break the feedback loop at a point where the impedance looking into the feedback network is much higher than the impedance looking into the amplifier input. A signal is injected into the loop, and the ratio of the signal at the output of the feedback network to the injected signal is measured, typically using a vector network analyzer or a frequency response analyzer.
What are the advantages of Direct current amplifier?
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Draw a circuit for automatically resetting the operating point of a direct amplifier.
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What is the necessity of Normal Mode rejection in a measurement system?
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List out the ways in which the various DVMs differ.
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Briefly discuss Megohm meters.
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What is four terminal impedance?
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Define Counter modulation.
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Draw the Schering Bridge and state its purpose.
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Part B
Define Envelope delay or group delay. Explain the measurement of Delay Distortion in a system.
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Describe the Effect of Low end cut offs on Square wave Response with suitable cases.
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Explain the Classical substitution method for measuring gain or loss.
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Mention the two ways of computing the response of a linear system to an arbitrary input and explain.
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Explain the working of Differential amplifier with relevant equations. Show at least two configurations.
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Explain the circuit of improved differential amplifier with 4 integrated circuit blocks.
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Discuss the operation of a Chopper amplifier in which transistor is used as a switch.
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Describe the open loop gain measurements in dc amplifiers.
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What are the inherent disadvantages of the peak responding voltmeter? Explain peak responding Voltmeter.
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What are the salient features of a dual slope integrating type DVM? Describe its working.
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What are the other detection methods to obtain true rms readings?
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Explain the operation of true-rms voltmeter with null-balance technique.
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Describe Direct - current comparators as resistance and impedance comparator.
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Discuss vector impedance meter with relevant diagrams.
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Define Complex Impedance and Admittance.
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Write short notes on Capacitance Standards.
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Discuss how the guard connection reduces the error in the circuit.
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Explain the correlation of sensitivity with noise figure in receiver.
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Explain Solid-state microwave amplifiers with advantages.
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Sinad Sensitivity
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Solid state microwave amplifier.
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