Process Control Systems — Winter 2021

Write seven process control objectives and explain any one in detail.

Give FOPDT model of system, Show how to derive the parameters of FOPDT model from Process Reaction Curve.

Analyze the closed loop response of first order system with proportional control to unit step change in set point and unit step change in process load.

What is self regulation? Give an example of self regulating process.

Briefly discuss override control scheme with associated diagram.

Draw the block diagram of cascade control scheme and Explain in Detail with suitable example. What are the limitations of cascade control strategy ?

Draw the basic block diagram of feed forward control and Explain in Detail with heat exchanger, suitable example .Write the difference between feedback and feed forward control scheme.

What are the performance criterions to design a control system ?

Explain shrinking and swelling phenomena in boiler drum and show three element control of boiler drum level.

What is degree of freedom ? Explain it in the context of CSTR with suitable equations and diagram.

Discuss the Bump less transfer Phenomenon, with suitable example.

What is integral windup ? Discuss with example.

Explain two position controller with suitable waveform. Show the effect of neutral zone on controller output.

Explain Multi-position controller function with error Vs. controller output relation.

What causes inverse response ? Explain with mathematical arguments and associated diagrams.

Give out the guidelines for digital implementation of a PID controller in detail. Describe the steps/formulae associated with the same too.

What is offset in case of proportional control action ? How offset can be eliminated?1

What is adaptive control ? Explain gain scheduling technique in the context of adaptive control with suitable diagram and mathematical calculation.

Discuss closed loop Zeigler Nichols tuning method of PID controller, with suitable diagram/calculation.

Explain selective control scheme, Briefly with suitable example.

What do you mean by the term ‘Dead Time’ ? What is its effect on the stability of system ?

With suitable diagram explain the control scheme for maintaining proper air to fuel ratio for drum boilers.

Briefly explain, the split range control scheme, with suitable example.

Discuss with the examples, the interacting and non-interacting processes and explain in brief.

How to convert nonlinear term to linear and why ? Explain the complete process and methods with suitable example.