The ratio controller
A. Can be used with any combination of related process variables
B. Has one measurement in put and two outputs
C. Can be used for even-numbered ratios
D. Must always employ the derivative mode in the controller
Answer:A
The ratio controller
A. Can be used with any combination of related process variables B. Has one measurement in put and two outputs C. Can be used for even-numbered ratios D. Must always employ the derivative mode in the controller