Process Control Systems — Winter 2020

Briefly discuss servo control and regulatory control problems.

Define the terms: (1) manipulated variable (2) controlled variable (3) transfer function (4) offset

Explain linearization method for processes with nonlinear elements.

Write down mass balance equation for a single tank liquid level system.

Differentiate between self regulating and non self regulating processes.

Derive mathematical model of continuous stirred tank reactor.

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

Derive and discuss unit step response of integrating process.

Discuss in detail the process reaction curve method to obtain FOPDT model of a process.

Draw and explain step response of PI controller.

Briefly explain inverse response process with an example.

Discuss two position control mode with suitable example. Discuss the significance of neutral zone.

Discuss Zero Order Hold (ZOH) in the context of digital controller.

Define the term ‘proportional band’ with suitable example. Discuss its effect on system stability.

Discuss closed loop Zeigler Nichols tuning method of PID controller.

What is integral wind up?

Explain any one anti wind up technique.

With necessary circuit and equations, discuss the electronic design of PID controller using operational amplifiers.

What is inferential control? Explain briefly.

Explain adaptive control briefly.

Discuss feed forward and feedback control schemes with suitable diagram and their advantages and disadvantages.

Briefly explain selective control scheme.

Discuss cascade control scheme with suitable diagram.

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