Which of following error integral is considered as the best criterion in controller settings ?

Related Mcqs:

1. 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...

2. The transfer function for a PID controller is (where, η i is the integral (reset) time and ηD is the derivative time.) ?

   A. Kc(1 + ηis + ηD ). s B. Kc[1 + (1/ηis) + ηD . s) C. Kc(1 + ηis + (1/ηD . s) D. None of these...

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. Suppose that the gain, time constant and dead time of a process with the following transfer function: Gc(s) = 10 exp( – 0.1s)/(0.5s + 1) are known with a possible error of ± 20% of their values. The largest permissible gain Kc of a proportional controller needs to be calculated below taking the values of process gain, time constant and dead time as________________?

   A. 8, 0.6, 0.08 B. 12, 0.6, 0.12 C. 8, 0.6, 0.12 D. 12, 0.4, 0.08...

5. According to Bode stability criterion, a system is unstable, if the open loop frequency response exhibits an amplitude ratio exceeding unity at frequency for which phase lag is_________________?

   A. 0° B. 45° C. 90° D. 180°...

6. “A control system is unstable, if the open loop frequency response exhibits an amplitude ratio exceeding unity at the crossover frequency.” This is _______________ criterion?

   A. Bode stability B. Nyquist C. Routh stability D. None of these...

7. 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...

8. Flapper nozzle is used in a/an ______________ controller?

   A. Electronic B. Hydraulic C. Pneumatic D. None of these...

9. Feed forward controller accounts for the ______________ changes?

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

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

    A. Proportional controller B. Proportional-derivative (PD) controller C. Proportional-integral (PI) controller D. Proportional integral-derivative (PID) controller...