JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech III Year PROCESS DYNAMICS AND CONTROL Previous Question Paper (January/February - 2023 - R18)
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
Define degrees of freedom.
Answer
The degrees of freedom of a process system represent the minimum number of independent variables that must be specified to uniquely determine the state of the system. Mathematically, it is defined as the difference between the number of process variables and the number of independent equations relating those variables.
Compare continuous process and batch process.
Answer
A continuous process involves the steady, uninterrupted flow of materials into and out of the system, where the process variables such as temperature, pressure, and flow rate remain constant over time at any given point. It is typically designed for high-volume production, offering high efficiency and consistent product quality, but requires significant capital investment and lacks flexibility for product changes.
A batch process involves processing a finite quantity of material in a series of steps within a closed system, where process variables change over time as the reaction or operation progresses. It is characterized by lower production volumes and is highly flexible, making it suitable for multi-product facilities, specialized chemicals, or pharmaceutical manufacturing where frequent changes in product specifications are required.
Define reset time.
Answer
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Compare P, I and D controller.
Answer
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Define controller tuning.
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What is Process Reaction Curve?
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Define control valve sizing.
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Define cavitation and Flashing.
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What is meant by multi variable control?
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Differentiate split-range control and selective control.
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Part B
Explain the necessity of mathematical modelling and obtain the mathematical model of first order thermal process.
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Obtain the mathematical model of level process shown in figure.
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With neat schematic diagram, describe the single speed floating control.
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Describe about pneumatic controller to realize proportional and integral control action.
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Discuss the procedure for setting controller parameters by using frequency response method.
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Discuss in detail about continuous oscillation and damped oscillation method.
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Explain the operation of I/P converter and P/I converter in detail.
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Describe briefly about the parameters involved in control valve selection and also discuss the characteristics of control valves.
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Discuss the Feed Forward Feedback Controller and Ratio Control in detail with example.
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Discuss with necessary diagram a multi variable control process using distillation column.
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