Control Systems Notes PDF Free Download

Control Systems Notes: Control Systems can be a difficult subject to understand in its entirety, what with it being an important subject for engineering courses. Studying can be very tough sometimes, but it is also one of the most important things in a student’s life. It is imperative to get great marks in all your subjects so that your marks card looks outstanding at the end of each semester.

Students can also visit Department Wise Lecture Notes for Preparation.

We know and understand the pressure to do well and to help you achieve that, we have provided certain reference materials to keep handy when studying. These should be helpful for all students of Control Systems as they have been carefully put together by us keeping only the students’ welfare in mind. A list of Control Systems’ study materials is as follows;

Introduction to Control Systems Notes – Free PDF Download

As mentioned before, we all know the problem that comes with the necessity to perform well in our exams. Our performance in exams may make or break what’s to return in our careers ahead in our lives. Thus, to ease your nervousness and anxiety, here are some carefully crafted Control Systems Notes for you.

  • Control Systems Lecture Notes
  • Note Control System Engineering CSE
  • Control System Engineering Lecture Notes
  • PDF Handwritten Control System Study Materials
  • PDF Control Systems Notes
  • Control Systems (CS) PDF Notes

B.Tech Electronics Control System Engineering (CSE) Course – Free, Downloadable PDF Notes

Control Systems focus on exactly what its name says – on the controlling of machines by providing a user with the desired response which is gained by controlling the output on that machine or device by changing the input. It is easy to understand it when relating it to real life where if we are nice to people (being the input) they will be nice to us (the output), too. On the other hand, if we are rude to someone, we can imagine that they will be rude back to us. Control Systems also work in a similar manner to this.

A Control System is used to decide the behaviour of a machine, device, or system using what we call control loops. Control loops are the central and most important component of Control Systems; they adjust values in the input such that it will change the output to your desire. The control loop has other several functions that come together to make a Control System work.

Control Systems Reference Books

It is important for a student to learn how to read and make proper use of reference books. Reference books for all subjects provide students with that bit of extra information which can be used to score exceptional marks. They also provide you with extra knowledge, oftentimes which is somewhat outside the course limits which is taught in classes. This kind of knowledge remains with you for your life rather than just for an exam.

Below, there have been listed several Control Systems reference books for the students of engineering. Extra readings for courses like engineering can help you out with several tips and tricks through getting to know more about the subject matter topics at hand.

Here is the list of Control Systems reference books:

  • Control Systems Engineering – IJ Nagrath, M Gopal
  • Automatic Control Systems – BC Kuo
  • Feedback Control of Dynamic Systems – GF Franklin, A Emami-Naeini
  • Problems and Solutions in Control System Engineering – Deepa
  • Control Systems Engineering – Norman Nise
  • Control System Engineering: Analysis and Design – Norman Nise
  • Control Systems: Theory and Applications – Ghosh
  • Automatic Control Systems – Farid Golnaraghi
  • Control Systems – Kumar Anand
  • Problems and Solutions of Control Systems with Essential Theory – Jairath AK

Control Systems Curriculum

The listed curriculum of a course allows a person to take a look at all the topics which are there to study. Using this curriculum, students can make checklists of all the topics and keep ticking off the topics that they have finished. This is a highly effective manner of studying, not only because you can see what all you have left to study, but also because seeing how much studying you get done can be great for keeping up morale. The importance of keeping in good spirits is immense when it comes to studying, because studying when feeling low can make retention of what you’re learning ineffective. An added benefit of having the course curriculum at hand is that you don’t miss out a single topic, and in the process, it enables you to be fully prepared for the coming examination.

Below is the unit wise and topic wise breakdown of the Control Systems curriculum.

Unit Topics
Basic Concepts
  • Introduction
  • Basic terminology
  • Objective of subject
  • Some basic examples
  • Notion of feedback
  • Open and closed loop systems
Mathematical Models
  • Representation of physical systems and analogous systems
  • Laplace transforms
  • Block diagrams
  • Transfer function for different types of systems
  • Block diagram reduction techniques
  • Signal flow graphs
  • Mason’s gain formula
Control Hardware and Their Models
  • Potentiometers
  • Synchros
  • LVDT
  • DC and AC servo motors
  • Tachogenerators
  • Electro-hydraulic valves
  • Pneumatic actuators
Time-Domain Analysis
  • Time domain performance criterion
  • Transient response of first order, second order and higher order systems
  • Steady state errors
    • Static and dynamic error constants
  • System types
  • Steady state errors for unity and non unity feedback systems
  • Performance analysis for P, PI and PID controllers
Frequency-Domain Analysis
  • Bode and polar plots
  • Frequency-domain specification
  • Correlation between transient response and frequency response
Stability Analysis
  • Concept of stability by Routh stability criterion
  • Nyquist stability criterion
  • Gain and phase margins
  • Relative stability
  • Constant m and N circles
  • Nichol’s chart and its application
Root-Locus Technique
  • Nature of root-locus
  • Rules of construction
  • Root-locus analysis of control systems
  • Types of compensation
  • Proportional, PI and PID controllers
  • Lead-lag compensators
State-Space Concepts
  • Eigenvalues and eigenvectors
  • The solution of state equations
    • Controllability
    • Observability
    • Pole placement result
  • Minimal representations
Non-Linear Systems
  • Characteristics of non-linear systems
  • Types of non-linearities
  • Phase-plane analysis
  • Limit cycles
  • Describing functions

List of Control Systems Important Questions

Preparing for an exam is all very well until you realise that the way you have been preparing does not suit the question paper you will be answering at all. In India, the system of education is very strongly set, where long lists of important questions help students prepare for their exams. Thus, when planning out a study schedule, do make sure to inculcate enough buffer time where you can sit and answer the important questions.

We have provided some Control Systems important questions for you which have been picked up from Control Systems question papers over the years. These will help you get a good idea of the kinds of questions which will be asked and it will also help you understand how you should study for the exam.

There are only 5 marks questions and 10 marks questions which come in the Control Systems question paper.

5 marks questions

  1. Explain the second order time domain specifications of a Control System.
  2. Explain frequency domain specifications of a third order control system.
  3. Sketch the root locus for a system having the following transfer function:
  4. Compare and contrast between open loop and closed loop control systems.
  5. Discuss the working of a stepper model and service a suitable mathematical model for it.

10 marks questions

  1. Distinguish between order and type of a system.
  2. Explain the correlation between time domain and frequency domain responses.
  3. Explain the Routh Hurwitz criteria for determining the stability of a system.
  4. Write the following differential equation in state equation format:
    x^3+ 3x^2+ 4x=r(t)
  5. The open loop transfer function of a system is given as follows. Comment on the stability of the system using a Nyquist plot.

Frequently Asked Questions about Control Systems Notes

Question 1.
What is the significance of Control Systems Notes?

For a lot of students, the pressure to score good marks and do well in engineering colleges is extremely high. This is because most students who get through engineering colleges spend most of their school lives preparing to get in for engineering courses by going for coachings starting at a very young age. For those students who are unable to cope in classes, Control Systems Notes come of great use. They are designed such that they will help students even if they haven’t been able to focus in classes. Control Systems Notes are helpful for all students and thus, they hold extreme significance.

Question 2.
What is the question paper pattern for Control Systems exams?

The Control Systems Engineering paper is for a total of 100 marks. The paper is divided into 4 sections –

Section A: 3 questions of 5 marks each (15 marks)
Section B: 3 questions of 5 marks each (15 marks)
Section C: 3 questions of 10 marks each (30 marks)
Section D: 4 questions of 10 marks each (40 marks

Question 3.
What are some good reference books to go along with Control Systems Notes?

Most reference books for Control Systems Engineering are good. The best ones are the ones suggested by professors of technical universities, which are:

  • Control System Engineering by IJ Nagrath IJ and M Gopal
  • Automatic Control Systems by BC Kuo
  • Modern Control Engineering by K Ogata
  • Control Systems: Principle and Design by M Gopal

Question 4.
Where can I find good Control Systems Notes and other study materials for it?

In the above article, we have provided the following great resources and study materials for Control Systems:

  • Control Systems Notes
  • Control Systems reference books
  • Control Systems curriculum
  • List of Control Systems important questions

These are all helpful study materials for Control Systems.


In the above article, we have provided some great study materials and resources for the subject of Control Systems in the field of engineering. This includes Control Systems Notes, some relevant reference books for the subject, the vast curriculum of the subject, and also a list of Control Systems important questions. All of these study materials are designed such that they will help you best prepare for your exams, especially if you use the same diligently while studying. We have put together the best resources that we could find and, hopefully, they will be adequately helpful for you.

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