2021 Practice Test

Question 1

What are the units of the input (DY) and the output (CV) in the distuarbance model in the
feedfonward plus feedback conrrol of jacketed CSTR (WYorkshop 11)? What is the unit of Kp? (6%)

Answer 1

Dv= C
Cv= C
KD= C/C= dimensioless

Question 2

in the same Wo:kshop 11, what is the unit of the input (MV) and what is the unit of output (CV) in
the process model? What is the unit of Kp? What is the unit of Kc and why?

Answer 2

Mv=%
CV=c
kp=c/%
kc= 1/kc= %/c

Question 3

Level1:
PID (P= RA, I- ARW, D= ldeal (meas), F= off)
What is the
meaning of P=RA used to characterize a PIDF controller in Control Station case studies plots? Is
Kc positive or negative in this case

Answer 3

Reverse acting, kc>0, position

Question 4

What are the meanings of F=off, D= ideal (meas), and I=ARW? (6%)

Answer 4

no filter, -Kctp(dy/dt), anti reset windup

Question 5

What is the bias for a 4-mode PIDF controller

Answer 5

The m=CO in the begging of a control cycle