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This automation industry quiz question comes from the ISA Certified Control Systems Technician (CCST) program. Certified Control System Technicians calibrate, document, troubleshoot, and repair/replace instrumentation for systems that measure and control level, temperature, pressure, flow, and other process variables. Click this link for more information about the CCST program.

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This blog covers numerous topics on industrial automation such as operations & management, continuous & batch processing, connectivity, manufacturing & machine control, and Industry 4.0.

Answer D is not correct. Feed-forward control can be configured for both forward- and reverse-acting loops and is concerned with the magnitude of control output changes based on process dynamics and transport times.

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The correct answer is B, direct acting. The controller output acts in the direction of the change of process variable, hence the name "direct acting." This type of controller would be used with a fail-closed valve in a pressure control scheme. As the pressure increases (controlled variable), the valve output would increase to open the valve in order to relieve the pressure.

Answer A is not correct, since reset windup is caused by allowing a controller's integral action to continue to operate after a valve has reached an output limit. This can occur with direct- or reverse-acting controllers.

About the EditorJoel Don is the community manager for ISA and is an independent content marketing, social media and public relations consultant. Prior to his work in marketing and PR, Joel served as an editor for regional newspapers and national magazines throughout the U.S. He earned a master's degree from the Medill School at Northwestern University with a focus on science, engineering and biomedical marketing communications, and a bachelor of science degree from UC San Diego.

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Bar Lights, also known as Linear Array Lights, offer both bright field and dark field illumination, depending on angle of incidence with respect to the object of interest.  Because of the variety of lengths available, bar lights are useful for large area illumination when used in opposing pairs or in a picture frame mounting orientation. Linear Array Lights can also be used in replacement of Spot or Ring Lights when greater intensity is required.

Answer C is not correct, since a reverse-acting controller will decrease its output as the controlled variable increases in value. This would be typical of a steam valve in a heating loop with a fail-closed valve. As the temperature rises, the output would decrease to reduce the amount of heat being transferred to the system.