# Hemwati Nandan Bahuguna Garhwal University 2005 B.E Electrical and Electronics Engineering automatic control system - Question Paper

Tuesday, 22 January 2013 12:50Web

**1.**The characterstic formula of a system is provided by: 5(s^6)+8(s^5)+12(s^4)+20(s^3)+100(s^2)+150(s)+200=0 Determine the stability of the system using Routh-Hurwitz criterion.

**2.**elaborate the following? discuss with examples:

**(**Gain margin

**i)****(**Phase margin

**i****i)****(**Polar plots

**i****i****i)****3.**Consider a unity feedback system with open loop transfer function: G(s)=20(s+1)/s(s+5)(s^2+2s+

**10)**Draw the Bode plot and determine the gain margin and phase margin.

**4.**Sketch the root locus plot of a unity feedback system with the open loop transfer function: G(s)=k/s(s+2)(s+

**4)**obtain the range of values of K for which the system has damped oscillatory respons

**e.**What is the greatest value of K which can be used before continuous oscillations occur?Also determine the frequency of continuous osillations. Determine the value of K so that the dominant pair of complex poles of the system has a damping ratio of 0.

**5.**

**5.**explain the effect of adding (i)a pole and (ii)a zero,to the system transfer function.

**6.**explain the Nyquist stability criterion with suitable examples.

**7.**What is the basic concept of control system compensation ? elaborate the different kinds of compensation schemes used in control systems?

Earning: Approval pending. |