Q5. With regards to process control system explain following: (4*4)
A. Proportional control.
B. Integral control.
C. Derivative control.
D. The necessity of derivative control.
Q5. (a) Define proportional control action. (4)
(b) Sketch and describe a simple pneumatic proportional controller. (6)
(c) State a process where a proportional controller may be employed. (3)
(d) State the disadvantage of proportional only action. (3)
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