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Which of the following is not used in DO measurement?

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

(a) Polarographic electrode

(b) Tubing method

(c) Tachometers

(d) Galvanic electrode

I have been asked this question by my school principal while I was bunking the class.

The above asked question is from Instrumentation and Control topic in chapter Instrumentation and Control of Fermentation Technology

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Best answer
Right answer is (c) Tachometers

To explain I would say: The tachometer is used in the measurement of pressure. The tubing method, polarographic electrode, galvanic electrode, etc are used in the measurement of dissolved oxygen concentration.

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