Question

a) What are the differences between feedback and feed-forward control system?
b) Choose the correct option:
i) A control system has 2 inputs and 1 output. What kind of advance control system will be
best suited for this?
A: Cascade Control; B: Feed-forward Control; C: Ration Control; D: Smith Predictor
ii) A water heating system contains large flow pipes. What kind of advance control system
will be best suited for this?
A: Cascade Control; B: Feed-forward Control; C: Ration Control; D: Smith Predictor
iii) What kind of advance control system will be best suited to control inlet flow of a reactor
with 2 reactants and 1 product.
A: Cascade Control; B: Feed-forward Control; C: Ration Control; D: Smith Predictor
iv) A system where the disturbance is varying rapidly. What kind of advance control system
will be best suited for this?
A: Cascade Control; B: Feed-forward Control; C: Ration Control; D: Smith Predictor
c) What changes in the hardware required to be made when the analog controller will be replaced
with a microprocessor/digital computer? Explain with a clear block diagram.

Answer 1

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The easy way to understand the difference between conventional feedback and feed-forward is to think in terms of the past and the future. Conventional feedback is past focused. It provides information about past activity and performance. Feed-forward on the other hand is future focused.

Answer 2

Answer:

An analog computer or analogue computer is a type of computer that uses the continuously changeable aspects of physical phenomena such as electrical, mechanical, or hydraulic quantities to model the problem being solved. In contrast, digital computers represent varying quantities symbolically and by discrete values of both time and amplitude.