Related Mcqs:

1. Which of the systems having the following transfer function is stable ?

   A. 1/(S2 + 2)
   B. 1/(S2 – 2S + 3)
   C. 1/(S2 + 2S + 2)
   D. exp (-20 S)/(S2 + 2S – 1)

2. For two non-interacting first order systems connected in series, the overall transfer function is the ______________ of the individual transfer functions?

   A. Product
   B. Ratio
   C. Sum
   D. Difference

3. In a feed-back control system G and H denote open loop and close loop transfer functions respectively. The output-input relationship is_____________?

   A. G/(1 + H)
   B. H/(1 + G)
   C. G/H
   D. H/G

4. Identify an unbounded input from inputs whose transfer functions are given below______________?

   A. 1
   B. 1/S
   C. 1/S2
   D. 1/(S2 + 1)

5. In a closed loop system, the process to be controlled is an integrating process with transfer function 1/2s. The controller proposed to be used in an integral controller with transfer function 1/T1s. When a step change in set point is applied to such a closed loop system, the controlled variable will exhibit__________________?

   A. Overdamped response
   B. Underdamped response
   C. Undamped response
   D. Unstable response

6. Find the ultimate gain and frequency for a proportional controller in the case of a process having the transfer function Gp(s) = 1/(4s + 1)(2s + 1)(s + 1) ?

   A. w = 1/√14, Kc = 45/7 √14
   B. w = √(7/6), Kc = 46/3
   C. w = 1, Kc = 13
   D. w = √(7/8), Kc = 45/4

7. The root locus plot of the roots of the characteristics equation of a closed loop system having the open loop transfer function K (s + 1)/[2 (2s + 1) (3s + 1)] will have a definite number of loci for variation of K from 0 to ∞. The number of loci is_______________?

   A. 1
   B. 2
   C. 3
   D. 4

8. For a feed back control system to be stable, the _________________?

   A. Roots of the characteristic equation should be real
   B. Poles of the closed loop transfer function should lie in the left half of the complex plane
   C. Bode plots of the corresponding open loop transfer function should monotonically decrease
   D. Poles of the closed loop transfer function should lie in the right half of the complex plane

9. The closed loop pole of a stable second order system could be_______________?

   A. Both real and positive
   B. Complex conjugate with positive real parts
   C. Both real and negative
   D. One real positive and the other real negative

10. A stable system is the one___________________?

    A. For which the output response is bounded for all bounded input
    B. Which exhibits an unbounded response to a bounded input
    C. Which satisfies the conditions for a servo problem
    D. None of these