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