To cascade controllers means to connect the output signal of one controller to the setpoint of another controller, with each controller sensing a different aspect of the same process. This flow of information is collectively referred to as a feedback control loop. The controller’s task is to inject the proper amount of negative feedback such that the process variable stabilizes over time. control valve), influencing the process which is sensed again by the measuring device. transmitter) goes to the controller, then to the final control device (e.g. Information from the measuring device (e.g. The effect of error damping is toĪns: c 89.A simple control system drawn in block diagram form looks like this:
Which of the following devices is used for conversion of co-ordinates ?Īns: c 88. Pressure error can be measured by which of the following ?Īns: a 87. In pneumatic control systems the control valve used as final control element convertsĪns: b 86. (c) The range of measured variables through which the air output chan¬ges from maximum to minimumĪns: c 85. (b) The range of measured variables from set value (a) The range of air output as measured variable varies from maximum to minimum In a control system the output of the controller is given to In an automatic control system which of the following elements is not used ?Īns: d 39. (c) Poor stability at reduced values of open loop gainĪns: d 38. In a stable control system backlash can cause which of the following ? Due to which of the following reasons excessive bond width in control systems should be avoided ?Īns: c 37. Which of the following statements is correct for a system with gain margin close to unity or a phase margin close to zero ?Īns: c 36. (c) Only one of the static error co-efficients has a finite non-zero valueĪns: c 35. (6) All the co-efficients are always non-zero (a) All the co-efficients can have zero value Which of the following statements is correct for any closed loop system ? (d) The time constant and suppress the oscillationsĪns: d 34. The second derivative input signals modify which of the following ? The transient response, with feedback system,Īns: d 33. On which of the following factors does the sensitivity of a closed loop system to gain changes and load disturbances depend ?Īns: d 32. (d) decreases by the same amount as the gain decreaseĪns: c 31. (c) increases by the same amount as the gain decrease (b) decreases by the same amount as the gain increase In closed loop control system, with positive value of feedback gain the overall gain of the system willĪns: c 30. A control system in which the control action is somehow dependent on the output is known asĪns: a 4. (c) Construction is simple and maintenance easyĪns: b 3. (b) Recalibration is not required for maintaining the required quality of the output For open control system which of the following statements is incorrect ? (c) Only system parameters have effect on the control outputĪns: a 2.
(a) Output is independent of control input Control Systems Objective Questions & Answers We prepared an article on Control Systems Objective Questions & Answers.
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