The post AutoQuiz: What Does a Low Resistance Reading from an Ungrounded Signal Lead Mean? first appeared on the ISA Interchange blog site.
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.
A low resistance reading from an ungrounded signal lead connected to a ground indicates a problem of:
a) a lead having an unwanted connection to ground
b) an open circuit from the lead to ground
c) an open circuit from the lead to the casing
d) all of the above
e) none of the above
Source: ISA News