JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech III ELECTRONIC INSTRUMENTATION Previous Question Paper (November/December - 2017 - R13)
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
Draw the block diagram that contains the components for phase measurement.
Answer
The phase measurement block diagram consists of two input channels (Signal A and Signal B), which are fed into individual limiters/shapers to convert them into square waves. These signals are then processed by an EX-OR gate or a flip-flop circuit to generate a pulse width proportional to the phase difference, which is subsequently measured by a digital counter or an average DC voltmeter.
Explain the low frequency step response of series condenser and shunt resister with help of system frequency characteristics.
Answer
A series capacitor and shunt resistor form a high-pass filter. In the frequency domain, it exhibits a 20 dB/decade roll-off below the cutoff frequency. When subjected to a step input, the circuit produces an output that decays exponentially towards zero as the capacitor charges, effectively blocking the DC component and passing only the transient change.
List the advantages and disadvantages of Direct-current amplifier with full-wave choppers and transformer isolation.
Answer
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Draw the Thevenin’s and Norton equivalent of an amplifier.
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Enumerate the different types of integrating DVM’s.
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Illustrate the working of quasi rms detector.
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Write the equation for sensitivity of wheat stone bridge.
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Illustrate the working of Wagner guarding circuit with neat diagram.
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List the problems of RF when used for inductance measurement.
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Write the equation for noise figure and power for single side band transreceiver.
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Part B
Explain the procedure for indirect route of linear characteristic system.
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Explain the method of loop gain measurement with loop still closed at low frequency.
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Illustrate the effect of low end and cutoff response of square wave.
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Illustrate the working of group delay method for measuring phase.
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Explain the working of input stage of differential coupled amplifier with relevant circuit diagram.
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Illustrate the working of the modified reset amplifier in reset mode.
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Explain the working of Direct-current amplifier with one chopper device for both modulation and demodulation with help of neat diagram.
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Illustrate the working of basic chopper amplifier with neat diagram.
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Briefly explain about the working of true rms voltmeter with null balance technique with help of neat block diagram.
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Illustrate the working of average responding detector with help of neat diagram.
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With the help of block diagram analyze the working of dual slope integrating system.
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Justify how digital voltage is measured using source as staircase waveform.
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Illustrate how ammeter-voltmeter-wattmeter method is used for impedance measurement.
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Briefly explain the working of DC and AC comparators.
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With help of neat diagram explain the working of Kelvin Double bridge.
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Illustrate how very high resistance is measured using suitable diagram.
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Illustrate how mutual inductance is measured using suitable bridge.
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With help of neat diagram illustrate the interference of communication system.
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Illustrate the working of Twin T network for impedance measurements.
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Explain how measurement of conductance susceptibility is done at higher frequencies.
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