IC8451 CONTROL SYSTEMS (CS)

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Important questions
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UNIT -1

1.Differential Equations Governing the Mechanical System

2.Transfer function of DC motors**

3.**Block reduction technique,

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4.Explain Open Loop & Closed loop system with an examples (8mark)

UNIT-2

1.Derive the expressions for the unit step response of a Second Order

(1)Under damped,

(2)undamped System

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2.Rules to construct Root locus of a system

3. PID controller comparison (6 marks)

UNIT-3

1.**Bode plot of a transfer function (phase margin and Gain margin )

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2**.Polar plot of a transfer function (phase margin and Gain margin )

UNIT-4

1.State and explain Nyquist stability criterion

2. Procedure for designing,Transfer function for Lag,lead,lag-lead compensator

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3. **Using Routh criterion find the stability of a system

UNIT-5

1.**Check the Controllability & Observability of a system

PART - C

Questions may be based on

Eg:-

UNIT -1

Convert a mechanical system into a electrical system

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UNIT - 4

Lag,Lead ,Lag -lead compensators

General Questions

Deriving a Transfer function or Differnential equations of a system

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**Very important questions are bolded and may be asked based on this topic

PART-C

1.Compulsory Questions {a case study where the student will have to read and analyse the subject }

mostly asked from unit (OR) a Problem given

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SYLLABUS

UNIT I SYSTEMS AND REPRESENTATION
Basic elements in control systems: — Open and closed loop systems — Electrical analogy of mechanical and thermal systems — Transfer function — AC and DC servomotors — Block diagram reduction techniques — Signal flow graphs.
UNIT II TIME RESPONSE
Time response: — Time domain specifications — Types of test input — I and II order system response — Error coefficients — Generalized error series — Steady state error — Root locus construction- Effects of P, PI, PID modes of feedback control –Time response analysis.
UNIT III FREQUENCY RESPONSE
Frequency response: — Bode plot — Polar plot — Determination of closed loop response from open loop response — Correlation between frequency domain and time domain specifications
UNIT IV STABILITY AND COMPENSATOR DESIGN
Characteristics equation — Routh Hurwitz criterion — Nyquist stability criterion- Performance criteria — Effect of Lag, lead and lag-lead compensation on frequency response-Design of Lag, lead and laglead compensator using bode plots.
UNIT V STATE VARIABLE ANALYSIS
Concept of state variables — State models for linear and time invariant Systems — Solution of state and output equation in controllable canonical form — Concepts of controllability and observability.

IC8451 CONTROL SYSTEMS (CS)