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. his 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.
A piston actuator:
a) seldom has both a pneumatic positioner and helper spring
b) can only be actuated by hydraulic pressure above 100 psig
c) cannot be made fail safe with out electric limit switches
d) can be used if a long stroke or high actuator pressure is required
e) none of the above