Process degree of freedom indicates _______________ number of controllers to be used?

Related Mcqs:

1. Positioning controllers are used for _______________?

   A. Low loads
   B. Temperature changes
   C. High loads
   D. Flow rate changes

2. Stabilising time for the controllers is the time required for the response to reach _____________ percent of its ultimate value?

   A. 63.2
   B. 87.5
   C. 95
   D. 100

3. On-off controllers are normally used for________________?

   A. Low loads
   B. Temperature changes
   C. Flow rate changes
   D. None of these

4. Which of the following controllers has the least maximum deviation ?

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

5. Which of the following controllers has maximum offset ?

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

6. Degree to which an instrument indicates the changes in measured variable without dynamic error is called its ___________________?

   A. Speed of response
   B. Reproducibility
   C. Fidelity
   D. Static characteristics

7. 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

8. 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

9. _______________ thermometer cannot measure sub-zero (< 0° C) temperature ?

   A. Mercury in glass
   B. Bimetallic
   C. Vapor pressure
   D. Resistance

10. “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