Jawaharlal Nehru Technological University Hyderabad
Jawaharlal Nehru Technological University Hyderabad B.Tech III ELECTRONIC INSTRUMENTATION Previous Question Paper (November/December - 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
Write the equation for measurement of loss and gain in decibel.
Answer
The gain or loss in decibels (dB) is expressed as:
or in terms of power:
Draw the block diagram of vector voltmeter arrangement.
Answer
The vector voltmeter consists of two channels (A and B) that feed into a phase detector and a magnitude detector. The block diagram includes:
- Input A and Input B probes
- Attenuators for each channel
- Amplifiers for each channel
- Phase detector (to measure phase difference)
- Magnitude detector (to measure amplitude)
- Display/Meter unit
Draw circuit diagram for overvoltage protection of differential amplifier.
Answer
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Justify the reasons for requirements of amplifier.
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Enumerate the different types of non integrating DVM’s.
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Draw the block diagram of phase lock voltmeter.
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Explain terms mutual inductance and trans conductance.
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Explain how voltmeter and ammeter is used to measure resistance.
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List the different specifications of radio equipments.
Answer
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Enumerate the steps required to get best accurate ratio.
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Part B
Analyze the working of time –domain reflectometer with help of neat diagram.
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Explain different methods of obtaining the impulse response.
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Explain various precautions that are followed in steady state measurement to avoid gross errors.
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Illustrate how group delay is measured using classical method.
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Deduce an equation for measurement of forward open loop gain of direct coupled amplifier with relevant circuit diagram.
Answer
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Explain the working of input stage of direct coupled amplifier with relevant circuit diagram.
Answer
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Illustrate the working of the basic circuit for automatic reset in direct coupled amplifier with suitable diagram.
Answer
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Justify how transistor can be used as chopper switch.
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Analyze the working of successive approximation type of DVM with help of neat block diagram.
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With help of neat diagram explain the working of peak to peak detector.
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Explain the working of direct current probes.
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Illustrate the working of sampling voltmeter with help of neat diagram.
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Illustrate how a medium resistance values can be determined by using wheat stone bridge with neat diagram.
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Explain the working of Warshawsky's resistance bridge.
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Explain how phase and magnitude of impedance is measured by vector impedance meter.
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Illustrate how resistance is measured using potentiometer with neat diagram.
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Illustrate with relevant equations about the different bridges used for measurement of high Impedance.
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Explain the working of semiautomatic bridge.
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With help of neat diagram explain the working of RF vector impedance meter.
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Illustrate how conductance impedance is measured on power lead with relevant diagram.
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