If response of a control system is to be free of offset and oscillation, the most suitable controller is_________________?

Related Mcqs:

1. The offset introduced by proportional controller with gain Kc in response of first order system can be reduced by ____________________?

   A. Reducing value of Kc
   B. Introducing integral control
   C. Introducing derivative control
   D. None of the above

2. A proportional controller with a gain of Kc is used to control a first order process. The offset will increase, if________________?

   A. Kc is reduced
   B. Kc is increased
   C. Integral control action is introduced
   D. Derivative control action is introduced

3. An ideal PID controller has the transfer function [1 + (1/0.55) + 0.25]. The frequency at which the magnitude ratio of the controller is 1, is________________?

   A. 0.5/0.2
   B. 0.2/0.5
   C. 0.2 × 0.5
   D. 1/√(0.2 × 0.5)

4. 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

5. Response of a system to a sinusoidal input is called _____________ response?

   A. Impulse
   B. Unit step
   C. Frequency
   D. None of these

6. Which of the following controllers has maximum offset ?

   A. P-controller
   B. P-I controller
   C. P-D controller
   D. P-I-D controller

7. 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

8. ______________ controller has the maximum stabilising time?

   A. P
   B. PD
   C. PI
   D. PID

9. Feed forward controller accounts for the ______________ changes?

   A. Set point
   B. Load
   C. Both A. & B.
   D. Neither A. nor B.

10. The transfer function for a P-D controller is________________?

    A. Kc(1+ηD s)
    B. Kc(1 +1/ηD s)
    C. Kc ηD s
    D. Kc/ηD s