|Discuss the following problems (a–g) in the context of control:
Identify control objectives;
Identify input variables and classify as (a) manipulated or (b) disturbance;
Identify output variables and classify these as (a) measured or (b) unmeasured;
Identify constraints and classify as (a) hard or (b) soft;
Identify operating characteristics and classify as (a) continuous, (b) batch, (c) semicontinuous (or semibatch);
Discuss safety, environmental, and economic considerations;
Discuss the types of control (feed forward or feedback).
Measurements and manipulated variables can vary continuously or may be sampled discretely.
Select from the following:
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