Today’s 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 information about the CCST program. This question comes from the Level I study guide, Domain 3, Troubleshooting. Level I represents a professional who has a five-year total of education, training, and/or experience.
Control valves, which have a plug positioned by a stem, which slides through a packing gland, are often referred to as:
a) rotary motion control valves
b) linear stem motion control valves
c) ball-control valves
d) motorized control valves
e) none of the above
Source: ISA News