JNTU
JNTU B.Tech III PROCESS CONTROL INSTRUMENTATION Previous Question Paper (May - 2019 - R15)
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 degrees of freedom of a process and write its significance.
Answer
Degrees of freedom (DOF) is defined as the number of independent variables that must be specified to uniquely define the state of a process. Its significance lies in determining whether a process is controllable; if the number of available control inputs equals the number of controlled variables, the system is exactly specified and controllable.
Write the differences between continuous and batch processes.
Answer
Continuous processes operate indefinitely with a steady flow of materials, whereas batch processes operate in discrete, finite cycles. Continuous processes are typically used for high-volume, uniform production, while batch processes are suited for low-volume, specialized, or multi-product manufacturing.
What is proportional band? Define narrow and wide proportional bands.
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Write about single speed-floating control action and its applications.
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What is controller tuning and why is it needed?
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Briefly explain the evaluation criteria of IAE, ISE and ITAE.
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What is Rangeability and Turndown of control valve?
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Write about cavitation and flashing in control valves.
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What is split range control? Where its used?
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What is multivariable control? List applications of multivariable control.
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Part B
Explain the dynamics and modelling of a liquid level system in detail.
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Write down the different instrument terms and symbols used in Piping and Instrumentation diagram.
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Explain different characteristics of processes and discuss the dynamics of temperature process.
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Discuss the dynamics of interacting and non - interacting systems with examples.
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Explain various control modes used in process control and describe the working of P+I+D control mode with help of neat diagrams.
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Draw the diagram of pneumatic PID controller and explain its working.
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Explain the working of a three term PID controller and describe the response of three term controller for step, ramp and sinusoidal inputs with neat diagrams.
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Draw the neat diagram of hydraulic PID controller and explain its working.
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Explain the evaluation criteria for controller settings and discuss the determination of optimum settings of process using time response analysis.
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Explain the Ziegler-Nichols method of controller tuning in detail.
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Describe the 1/4 decay ratio, IEA, ISE and ITAE performance criteria of controller settings.
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Describe the continuous oscillation and damped oscillation methods of controller tuning.
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Explain the construction working and applications of I/P converter and P/I converter with neat schematic diagrams.
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Draw the schematic diagram of double seated control valve and derive the equation for flow of fluids through the control valve.
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Explain the working of valve positioner with a neat diagram and discuss the advantages of valve positioner in a control valve.
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Describe the working of rotating stem control valves with neat diagrams and draw their characteristics.
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Draw the schematic diagram of a cascaded control system and explain its working with typical Example.
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Describe the multi variable control scheme used in Boiler drum level control with neat schematic diagram.
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Explain with a neat diagram the working of a feed forward control and discuss the conditions for implementing feed forward control.
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Describe the multivariable control scheme used in distillation column control with a neat schematic diagram.
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