A proportional-derivative controller senses an increase in the controlled parameter above the controller setpoint.
The derivative function causes the controller output signal to…
A. increase until the controlled parameter equals the controller setpoint, at which time the output signal becomes constant.
B. remain directly proportional to the difference between the controlled parameter and the controller setpoint.
C. increase until the controlled parameter equals the controller setpoint, at which time the output signal becomes zero.
D. change at a rate that is directly proportional to the rate of change of the controlled param
Show Answer
Answer: D
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