Feedforward Control Questions & Answers

1. The feedback control system:

a. Cannot make corrections until a measurable error exists
b. Makes a change in output which is the differentiated error
c. Is always superior to a feedforward system in operation
d. Is theoretically capable of perfect control

Answer: a

2. The feedforward control system:

a. Cannot make corrections until a measurable error exists
b. Makes a change in output that is the integrated error
c. Requires little knowledge of the process before installation
d. Is theoretically capable of perfect control

Answer: d

3. The original boiler drum level application of feedforward control, developed in 1925:

a. Is still being applied everyday
b. Was abandoned because of poor measuring techniques
c. Worked well only with the particular boiler for which it was originally designed
d. Was immediately recognized as the ultimate control system

Answer: a

4. A properly designed feedforward control system:

a. Should be applied to every process
b. Should be employed when its use can be justified economically and technologically
c. Is always easier to adjust than a feedback system
d. Will always result in more economical process operation

Answer: b

5. The most dramatic application of feedforward techniques has occurred in their application to:

a. Heat exchangers
b. Level processes
c. Flow processes
d. Distillation columns

Answer: d