JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech IV ELECTRONIC MEASUREMENTS AND INSTRUMENTATION Previous Question Paper (December - 2019 - R15)
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.
Part A
Define gross errors and systematic errors.
Answer
Gross errors are human mistakes in reading, recording, or calculating data, often caused by carelessness. Systematic errors are consistent, repeatable inaccuracies inherent in the measurement system, such as calibration errors or environmental effects, which can be corrected.
State specification of instruments
Answer
Specifications of instruments include accuracy, precision, resolution, sensitivity, range, linearity, hysteresis, threshold, and response time. These parameters define the performance limits and reliability of the measurement device under specified operating conditions.
Define distortion
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State the applications of pulse and square wave generators.
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How frequency can be measured using oscilloscope?
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How frequency can be measured using Lissajous figures.
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Explain the principle of piezo transducer.
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Draw Syncro diagram.
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What is meant by balancing a bridge?
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Draw the block diagram of data acquisition system.
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Part B
Explain the basic principle of a shunt type ohmmeter.
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Calculate the maximum percentage error in the sum and difference of two voltage measurements when V1=100v ± 1% and V2=80v ± 5%.
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Define Accuracy, Precision, Resolution and Limiting error.
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Design a range switch for an ammeter, with an internal resistance rm = 100 Ω and a full scale deflection of Im=1mA. The meter is to measure in the ranges of 10mA, 100mA and 500mA.
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What are the main requirements of sine wave signal generator in instrumentation?
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Explain with suitable block diagram how an AF sine/ square generator works.
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What is wave analyzer? Explain how it analyzes the harmonics?
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Enlist the various applications of spectrum analyzer along with the description of its working.
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State the standard specification of a sample CRO.
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Explain the operation of a sampling oscilloscope with a neat block schematic diagram. What is its advantage over the conventional oscilloscope?
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Explain the block diagram of a vertical deflection system and explain the function of each block.
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Explain the following CRO controls: i) Focus ii) Trigger and calibration.
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A transducer that measures force has nominal resting resistance of 300 Ω and is excited by 7.5V. When a 980 dyne force is applied, all four equal resistance bridge elements change resistance by 5.2 Ω. Find the output voltage Eo.
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Draw the various kinds of thermocouple junctions and their sheaths and discuss the seeback effect in thermocouple.
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Draw the diagram of strain gauge and explain the principle of measurement.
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Draw the various kinds of thermometers and explain the principle of operation.
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The basic AC bridge consists of the following constants: AB: R=400Ω, BC: R=150 Ω, CD: unknown and DA: R=100 Ω in series with L=10mH. Oscillator frequency is 1KHz. Determine the constants of arm CD.
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What is double Kelvin bridge? Derive the expression for the unknown resistance.
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Explain how LVDT is used to measure linear displacement.
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How moisture in the air can be measured using transducers.
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