JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech III PROCESS DYNAMICS AND CONTROL 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
Define a simple process.
Answer
A simple process is a process that can be described by a first-order differential equation, typically characterized by a single time constant and a process gain, where the output responds exponentially to a step change in input.
What is meant by self-regulation?
Answer
Self-regulation is the inherent ability of a process to reach a new steady state following a disturbance without the intervention of an external control system. It occurs when the process output naturally balances the input, such as a liquid level tank with an outlet pipe where flow increases with head.
Define proportional band.
Answer
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What is meant single speed floating control? Give its applications.
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What is a process reaction curve?
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Get the limitations of derivative controller.
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What is the function of valve positioner?
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What are P/I and I/P converter? State the standard values for P and I in instrumentation practice.
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What is ratio control? Where is it needed?
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What is feed forward control? Explain.
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Part B
Describe a simple thermal system in which incoming liquid is heated by the heater in the tank and going out with higher temperature. Develop first order transfer function of the thermal process.
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What is the need of servo operation?
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Derive the mathematical model of a thermal process from fundamentals.
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List the merits and demerits of continuous and batch process.
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With a neat sketch, explain PI pneumatic controller.
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Explain the various time integral performance criteria in a closed loop response.
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A PI controller has 20% proportional band and integral time of 10sec for a constant error of 5%, determine the controller output after 10sec the controller offset is 25%.
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Compare the features of ON&OFF, P, I, D control modes and draw their characteristics.
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What are the principles that arise during the design of feedback controller? Discuss them on the basis of physical example.
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Explain the method of process reaction curve and damped oscillations for tuning the controllers.
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Write the flow equation of equal percentage valve and sketch its inherent valve characteristics.
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Give comparison of electric and hydraulic actuators.
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Discuss about the characteristics of control valves briefly.
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Write a short note on cavitations and flashing effect.
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What is split range control? Describe the instant when you could use split range control.
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List the difficulties involved in controlling multivariable system with and example from distillation column.
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Justify that cascade controller gives better performance than feedback controller.
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Get the differences between ratio control and cascade control.
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