JNTU
JNTU B.Tech III INSTRUMENTATION AND PROCESS CONTROL Previous Question Paper (May/June - 2019 - 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 fidelity.
Answer
Fidelity is the ability of an instrument to reproduce the changes in the input variable faithfully without any dynamic error. It represents the degree to which the output signal is an exact replica of the input signal.
What is first order system? Give examples.
Answer
A first-order system is a physical system whose dynamic behavior is described by a first-order linear differential equation. It is characterized by a single energy storage element and a single dissipation element. Examples include a mercury-in-glass thermometer and a stirred-tank heater.
What is GC? Give its uses?
Answer
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Explain uses of HPLC.
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Give example for area flow meter.
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What is gauge pressure? How it is calculated?
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Define the transfer function of a mixing process.
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What is regulatory problem? Give example.
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Define stability of a control system.
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Explain Bode stability criterion.
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Part B
Describe the static characteristics of an instrument. Give examples.
Answer
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Describe about pressure spring thermometer with a neat diagram.
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Describe about different types of thermocouples used in industry.
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Explain about emission and mass spectroscopy.
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Explain the measurement of pressure in corrosive liquids with examples.
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How do you measure the head, density and specific gravity? Explain the equations connected to these parameters.
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Derive the standard transfer function of a second order system by taking the example of damped vibrator. Explain all the terms used.
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The time constant of a thermometer is 6 seconds. It is at a steady state value of 90°F. At time t = 0, the thermometer is placed in a bath which is maintained at 100°F. Calculate the time when it reads 98°F.
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Derive the sinusoidal response of a general first order system.
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Determine the stability of the control system shown in below figure using Routh method.
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Discuss the rules for plotting Root locus diagram in detail.
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