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## AutoQuiz: What Is a Schematic Representation of a Complete Hydraulic, Electric, Magnetic, or Pneumatic Circuit Called?

The post AutoQuiz: What Is a Schematic Representation of a Complete Hydraulic, Electric, Magnetic, or Pneumatic Circuit Called? first appeared on the ISA Interchange blog site.

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

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