Process Control QuizBy Sudha M / June 13, 2023 Welcome to your Process Control Quiz 1. It is that variable which is measured monitored and controlled? manipulated variable process variable control variable none 2. For studying detailed variations with time, one uses indicator digital indicator Integrator recorder 3. __________is a set of technologies that results in operation of machines and systems without significant human intervention and achieves performance superior to manual operation Control System Automation Mechatronics Instrumentation 4. The _________ is a function which describes the process and provides the information about other process parameters which influence the controlled variable. Control System Automation process equation instrumentation 5. Whenever a process load change or transient occurs, it causes a change in the controlled variable. The process control loop responds to this change to ensure that, after some finite time the controlled variable reaches the setpoint. The part of this time consumed by process itself is called __________. Control lag Automation Process equation Process lag 6. The deviation of controlled variable from the set point is called________. Control lag Automation error process lag 7. What is the overall transfer function (C/R) of the following block diagram if G = G1. G2. G3 and H = H1H2. 1/(1 + GH) G/(1 + GH) H/(1 + GH) G/(1 - GH) 8. The transfer function of first order system is 1/(Ts + 1) 1/Ts s/(Ts + 1) None of these 9. Water is flowing through a series of four tanks and getting heated as shown in figure. It is desired to design a cascade control scheme for controlling the temperature of water leaving the tank 4 as there is a disturbance in the temperature of a second stream entering the tank 2. Select the best place to take the secondary measurement for the second loop. Tank 1 Tank 2 Tank 3 Tank 4 10. In second order underdamped system, Decay ratio = overshoot Decay ratio = (overshoot) Overshoot increases for increasing damping co-efficient Large damping co-efficient means smaller damping 11. A stable system is the one For which the output response is bounded for all bounded input Which exhibits an unbounded response to a bounded input Which satisfies the conditions for a servo problem d) None of these 12. Process degree of freedom indicates __________ number of controllers to be used. The maximum The minimum Both maximum and the minimum Nothing about the 13. A proportional controller with a gain of Kc is used to control a first order process. The offset will increase, if Kc is reduced Kc is increased Integral control action is introduced Derivative control action is introduced 14. On-off controllers are normally used for Low loads Temperature changes Flow rate change None of these 15. For a feed back control system to be stable, the Roots of the characteristic equation should be real Poles of the closed loop transfer function should lie in the left half of the complex plane Bode plots of the corresponding open loop transfer function should monotonically decrease Poles of the closed loop transfer function should lie in the right half of the complex plane 16. What is the order of response exhibited by a U-tube manometer? (A) Zero order (B) First order (C) Second order (D) Third order 17. The response of two tanks of same size and resistance in series is Under damped` ` Critically damped Over damped None of the above 18. In the closed loop control system, proportional Integral controller mode is preferred when compared to Proportional controller (P) Fast Response High gain zero steady state error low overshoot 19. Slow response of over-damped system can be made faster with the help of PD controller P Controller PI Controller remote 20. Which one of the following can be result of introducing an integral action in the forward path of unity feedback system Reduce noise immunity Elimination of steady state error Increased stability margins Faster system response 21. The function of the proportional plus integral mode is to ____________? Provide gain Eliminate offsets To speed up the response and minimize the overshoot All of the above 22. Which one of the following controllers increases the damping ratio of the system? Proportional controller Proportional Derivative controller Proportional integral controller None of the above 23. Which one of the following controllers reduces the steady state error? P controller PI controller Both a and b None of the above 24. The function of the proportional plus derivative mode is to ____________? Provide gain Eliminate offsets To speed up the response and minimize the overshoot All of the above 1 out of 24 Please fill in the comment box below. Time's up
