JNTU
JNTU B.Tech III ELECTRONIC MEASUREMENTS AND 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
What are the basic elements of a generalized measurement system?
Answer
The basic elements of a generalized measurement system are the primary sensing element, variable conversion element, variable manipulation element, data transmission element, data processing element, and data presentation element.
What are the sources of errors in D.C voltage measurement?
Answer
Sources of errors in D.C. voltage measurement include: 1) Loading effects due to finite input impedance of the meter, 2) Thermal EMFs at junction points of dissimilar metals, 3) Noise and interference (EMI/RFI) picked up by leads, and 4) Calibration errors or drift in the instrument's internal reference source.
Write applications of spectrum analyzer.
Answer
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Give the functions of an attenuator in a signal generator.
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What are the two modes of operation in dual trace oscilloscope?
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What are Lissajous figures? On what factor shape of the figures depends?
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What is mean by digital temperature sensing system?
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Give the applications, advantages of Thermocouples.
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Write the two conditions to be satisfied to make an a.c bridge balance.
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Write about pressure sensors.
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Part B
A voltmeter having a sensitivity of 15 kΩ/V reads 80V in its 100 V scale when connected across an unknown resistance Rx. The current through the resistor is 1.8 mA. Determine the % error due to loading effect.
Answer
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Explain working of True RMS voltmeter.
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Discuss the different types of errors found in a measurement.
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Describe the working of series type ohmmeter.
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Draw the block diagram of fundamental suppressions harmonic distortion analyzer and explain its principle of operation.
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Describe the operation of power analyzer.
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Explain the sweep frequency generator.
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Differentiate wave analyzer and harmonic distortion analyzer.
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How to measure time, period and frequency using oscilloscope?
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Write about different types of CRO probes.
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Discuss the working of the Dual beam oscilloscope.
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Illustrate with neat sketch about horizontal amplifier.
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Illustrate and explain the working of LVDT.
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Describe the hotwire anemometer and explain.
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Explain the principle of working of synchros.
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Describe the magneto strictive transducers.
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A Maxwell bridge is used to measure an inductive impedance. The bridge constants at balance are C1 = 0.01 μF, R1 = 470 KΩ, R2 = 5.1 KΩ and R3 = 100 Ω. Find the series equivalent of the unknown impedance.
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Discuss the measurement of Moisture.
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Describe any one bridge circuit for the measurement of inductance.
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Explain a method of measurement of liquid level.
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