JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech III ELECTRICAL AND ELECTRONICS INSTRUMENTATION Previous Question Paper (July - 2023 - R16)
Note: i) Question paper consists of Part A, Part B. ii) Part A is compulsory, which carries 25 marks. In Part A, Answer all questions. iii) In Part B, Answer any one question from each unit. Each question carries 10 marks and may have a, b as sub questions.
Part A
What do you mean by sampled data?
Answer
Sampled data refers to a signal obtained by measuring the values of a continuous-time signal at discrete, periodic intervals of time. Instead of representing the signal continuously, the data is represented as a sequence of discrete values, which allows for digital processing, storage, and transmission of information that was originally analog in nature.
Distinguish between periodic signal and aperiodic signal.
Answer
A periodic signal is a signal that repeats its pattern exactly at regular intervals of time. It satisfies the condition x(t) = x(t + T) for all t, where T is the fundamental time period. Examples include sine waves and square waves.
An aperiodic signal (or non-periodic signal) is a signal that does not repeat its pattern at any regular interval of time. It does not satisfy the periodicity condition for any finite value of T. Examples include random noise and transient signals like a single exponential pulse.
List the advantages of Digital voltmeter.
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Explain the significance of a Sweep generator in a CRO.
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Define the term Distortion factor.
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Explain the significance of a basic wave analyser.
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Distinguish between an Active transducer and Passive transducer.
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List the advantages of Electrical transducers.
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Define Gauge Sensitivity.
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How do you measure temperature with transducers?
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Part B
Explain the following types of Static errors in detail: a) Gross errors b) Systematic errors c) Random errors
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Explain about dynamic characteristics of a measuring system.
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A voltmeter reading 60 V on its 100 V range and an ammeter reading 90 mA on its 150-mA range are used to determine the power dissipated in a resistor. Both these instruments are guaranteed to be accurate within ± 2% at full scale deflection. Determine the limiting error of the power.
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Draw and explain the block diagram of a CRO.
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Explain the working of digital phase angle meter.
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Explain the working of ramp type digital voltmeter with a neat block diagram
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What are Lissajous figures in CRO and explain what you can find frequency and phase from it.
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Explain the working of vector impedance meter with a neat diagram.
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Explain the working of RMS voltmeter with a neat diagram.
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With a neat block diagram, explain the working of heterodyne wave analyser.
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Explain the working of following types of wire strain gauge: i) unbonded metal strain gauge and ii) bonded strain gauge.
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A resistance, wire strain gauge with a gauge factor of 4 is bonded to a steel structural member subjected to a stress of 200 MN/m2. The modulus of elasticity of steel is 400 GN/m2. Calculate the percentage in value of the gauge resistance due to the applied stress.
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Explain the working of Linear Variable Differential Transformer (LVDT) with a neat diagram.
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What are Piezoelectric transducers and explain their modes of operation.
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Explain the method of Strain gauge type torque measurement.
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Explain the method of Ultrasonic liquid level measurement system.
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