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Which of the following combination of control is not used in practice?

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+1 vote
in Fermentation Technology by (72.1k points)
Which of the following combination of control is not used in practice?

(a) Proportional plus integral

(b) Proportional plus integral minus derivative

(c) Proportional plus derivative

(d) Proportional plus integral plus derivative

The question was asked in examination.

Origin of the question is Instrumentation and Control topic in portion Instrumentation and Control of Fermentation Technology

1 Answer

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by (424k points)
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Best answer
Right choice is (b) Proportional plus integral minus derivative

The best I can explain: Three combinations of the control system are used in practice: Proportional plus integral, Proportional plus derivative, Proportional plus integral plus derivative. Proportional plus integral minus derivative is not a type of combination control.

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