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AutoQuiz is edited by Joel Don, ISA's social media community manager. Today's automation industry quiz question comes from the ISA Certified Automation Professional certification program. ISA CAP certification provides a non-biased, third-party, objective assessment and confirmation of an automation professional's skills. The CAP exam is focused on direction, definition, design, development/application, deployment, documentation, and support of systems, software, and equipment used in control systems, manufacturing information systems, systems integration, and operational consulting. Click this link for information about the CAP program. The following question comes from the CAP study guide, Performance Domain I, Feasibility Study: Identify scope and justify the automation project.  Which of the following control strategies works to measure disturbances and compensate for them before they cause the controlled variable to deviate from the set point? a) feedforward The objective of feedforward control is to measure disturbances and compensate for them before the controlled variable deviates from set point. Feedback control can compensate for a disturbance only after the control variable has deviated from set point. Cascade is a form of feedback control. Open loop is not a control strategy. The best answer is A, feedforward. Reference: Carlos A. Smith and Armando B. Corripio; Principles and Practices of Automatic Process Control. Chapter 2: Interface Devices1. An inverting op amp circuit has RF = 5 kilohms and RIN = 1 kilohm. What is the gain of this= Get answer to your question and much more 2. What is the output voltage of the circuit in Figure 2-30? Get answer to your question and much more 3. A noninverting op amp with an input resistor of 10 kilohms and a feedback resistor of 50kilohms has 0.4 volts applied to its input. What is the output voltage? Get answer to your question and much more 4. At the moment an input signal applied to an integrator changes from 0 to +3 volts, it has a________ (minimum, maximum) gain. Get answer to your question and much more 6. The process where the switching threshold on a positive-going input signal applied to aSchmitt trigger is higher than the negative-going signal is referred to as Get answer to your question and much more What is the controlled variable in the control loop?Definition(s): The variable that the control system attempts to keep at the set point value. The set point may be constant or variable.
What is the term used to describe the difference between the measured value of the controlled condition and the command signal?In the control system, the controller compares the measurement signal of the controlled variable to the set point (the desired value of the controlled variable). The difference between the two values is called the error.
What type of feedback signal does the closed loop industrial control typically uses?Figure 1: Basic closed-loop control uses a negative feedback error signal derived from a comparison of the desired setpoint versus the actual measured process variable (from National Instruments).
What are the two classifications of industrial control systems?There are several types of ICSs, the most common of which are Supervisory Control and Data Acquisition (SCADA) systems, and Distributed Control Systems (DCS).
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The objective of control is to prevent the controlled variable from deviating from the setpoint.
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