AutoQuiz is edited by Joel Don, ISA's social media community manager.

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.

A schematic that is a representation of a complete hydraulic, electric, magnetic, or pneumatic circuit is called a:

a) process and instrumentation diagram (P&ID)
b) logic diagram
c) loop diagram
d) process flow diagram
e) all of the above

Click Here to Reveal the Answer

Answer A, P&ID, is a diagram that shows the interconnection of process equipment and the instrumentation used to control the process.

Answer B, logic diagram, is a diagram used to define on/off control.

Answer D, process flow diagram, is a diagram that defines a process schematically and shows how much of each product a plant might make.

The correct answer is C, loop diagram. This diagram shows complete details of a hydraulic, electric, magnetic, or pneumatic circuit, showing all of the interconnections, components, and devices that participate in that circuit.

Reference: Goettsche, L.D. (Editor), Maintenance of Instruments and Systems, 2nd Edition

About the Editor
Joel 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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