# EE2253 Control Systems Important Questions

**UNIT 1**

**1. Explain the TF of armature and field controlled DC motor. (16)**

**2. Problem from mechanical translational system(analogy of force- voltage and forcecurrent)**

**(16)**

**3. Problem from signal flow graph + block diagram (8 +8 )**

**Unit 2**

**1. Explain servomotors and its types (16)**

**2. Derive the time response of underdamped and critically damped second order**

**system for unit step input (16)**

**3. Derive the expression for time domain specifications (16)**

**Unit 3**

**1. Derive the frequency domain specifications of second order system (16)**

**2. Problem from bode plot determining phase margin,gain margin ,determination of**

**k value,gain and phase cross over frequency( any 2 ) (16)**

**3. Problem from polar plot (same as bode plot )(16)**

**4. Explain frequency domain specifications (8)**

**Unit-4**

**1. Explain the locatiuon of poles on s-plane for stability (16)**

**2. Problems from routh Hurwitz criterion (8)**

**3. Problems to determine gain and phase cross over frequency, gain and phase**

**margin from given TF (16)**

**4. Problems from root locus (16)**

**Unit – 5**

**1. Derive the realisation of electrical network, frequency response, determination of**

**maximum phase lag and max. Lag angle for**

**a) lag compensator (16)**

**b) lead compensator (16) (separate questions)**

**2. problems from lag compensator or lead compensator (each 16 marks )**

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