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 more information about the CCST program.

In the plot of inherent control valve characteristics shown in the post image, what characteristic does curve C represent?

a) equal percentage
b) leak tight shutoff
c) linear
d) quick opening
e) none of the above