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4.List two examples of controlled variables for motion controlapplications and two examples for process control applica-tions.Which of the following factors contribute to the dynamicresponse of a single control loop?Motion ControlProcess Control5.List one example of a measurement device for a motion controlapplication and one example for a process control application.Motion ControlProcess Control6.The control method used incontrol applications is tosustain a constant condition of the controlled variable.T/FThe manipulated variable and controlled variable aresynonymous terms in a closed-loop system.19.T/FThe basic concept of feedback control is that anerror must exist before some corrective action can bemade.a.servob. process7.An open-loop system does not have a.A pressurized tank must maintain a gas at 325 psi. Apressure sensor is used to measure the condition of thecontrolled variable. As the gas cools, the pressure in thetank decreases. When it drops to 300 psi, a valve is opened,which allows steam to flow to a heat exchanger inside thetank. The additional steam heats the gas and causes pressureto rise.8.T/FThe measured variable represents the condition of thecontrolled variable.9.The output of the measurement device is called the.10.Define set point.What is the manipulated variable in this process?What is the set point?What is the measured variable?11.The difference between the set point and feedback signal isreferred to as thesignal, and is produced by thedetector.The controller can be considered the brain of aclosed-loop system.13.Altering thevariable causes the condition ofthevariable to change.T/FFeed-forward control is seldom used except incombination with feedback control.14.The device that provides the muscle to perform work in theclosed-loop system is referred to as the15.Theis sent to the final control element..a.measured variablec.error signalb.feedback signald.control signal16.Which of the following influences cause a controlled vari-able to change?17.Which of the following factors contribute to the dynamicresponse of a single control loop?18.T/FThe manipulated variable and controlled variable aresynonymous terms in a closed-loop system.19.T/FThe basic concept of feedback control is that anerror must exist before some corrective action can bemade.20.A pressurized tank must maintain a gas at 325 psi. Apressure sensor is used to measure the condition of thecontrolled variable. As the gas cools, the pressure in thetank decreases. When it drops to 300 psi, a valve is opened,which allows steam to flow to a heat exchanger inside thetank. The additional steam heats the gas and causes pressureto rise.What is the controlled variable in this process?What is the manipulated variable in this process?What is the set point?What is the measured variable?21.T/FFeed-forward control is seldom used except incombination with feedback control.Problems
22.Which of the following conditions are compensated forby using feed-forward control?a.Excessive lag timec.An error signalb.Large disturbancesd.Feedback signal24.When feedback and feed-forward control are performedtogether, the primary function of feed-forward is to makecorrections fordisturbances, and feedback control tomake corrections fordisturbances.16SECTION 1●Industrial Control Overview
23.The objective ofcontrol is to prevent the controlled
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variable from deviating from the set point.
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Answers to Odd-Numbered ProblemstCHAPTER 11.motion, process or open-loop, closed-loop3.negative5.Motion ControlProcess ControlHall-effect speed sensorFloat7.c.feedback loop15.d.control signal9.feedback signal17.d.All of the above.11.error, error19.True13.b.manipulated;21.Truea. controlled23.b.feed-forward
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industrial control systems, Industrial Control Overview
What is the term used to describe the difference between the measured value of the controlled condition and the command signal?
Which of the following describes the amount of change in the electrical output of a sensor for a given amount of change in the physical input?
Which elements and signals of a control system do not exist in an open loop configuration?
Term An open loop-system is not self-correcting. | Definition TRUE |
Term Which elements and signals of a control system do not exist in an open-loop configuration? a. comparator. d. Feed-back signal b. error signal. e. All of the above. c. Measurement device. | Definition e. All of the above |