JNTU
JNTU B.Tech III INSTRUMENTATION AND PROCESS CONTROL Previous Question Paper (November/December - 2017 - 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
Define the desired dynamic characteristics of an instrument.
Answer
The desired dynamic characteristics of an instrument include fast response (minimal time lag), high fidelity (faithful reproduction of input), and stability (absence of oscillations or undesirable transients) during changes in the measured variable.
Define: Accuracy, Sensitivity, Reproducibility.
Answer
Accuracy is the closeness with which an instrument reading approaches the true value of the variable being measured. Sensitivity is the ratio of the change in output of the instrument to the change in the input variable. Reproducibility is the degree of closeness with which a given value may be repeatedly measured under the same operating conditions.
Define thermocouple and thermopile.
Answer
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List out different types of industrial thermocouples available?
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Name some indirect method of level measurement.
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Describe the principle of float type level gauge.
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Define Transfer Function.
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List the characteristics of first order process.
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Illustrate the second order system using its general form of transfer function.
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Summarize the practical significance of the gain margin.
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Part B
Write the working principle of Pressure spring thermometer. What are the functional elements involved in it? Explain about Ambient – Compensation method?
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Describe the working principles of bimetallic thermometer. Write about static accuracy and response of bimetallic thermometer.
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Define Spectroscopy. Explain about working principle of UV-Spectroscopy. Write about Beer – Lamberts law.
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Define Chromatography. Explain about GC-MS.
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Describe the methods for direct measurement of liquid level.
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Examine the construction, working of an orifice plate and venturi tube. Write advantage and disadvantages of each method.
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Derive an equation for transient response of first order system to sinusoidal forcing function.
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Explain the salient features of P, PI, PID controllers. Discuss the working of electronic PID and PI controllers with neat diagram.
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Write about stability analysis by Routh’s criterion.
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Write the steps involved in the construction of root-locus.
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Draw the Bode plot for the system with transfer function
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