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The block diagram for parallel mode analyser of NO and NO2 is given below. Identify the unmarked block in the diagram.

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The block diagram for parallel mode analyser of NO and NO2 is given below. Identify the unmarked block in the diagram.

(a) NO Analyser

(b) NO2 to NO reduction

(c) NO2 remover

(d) Difference

The question was asked during an internship interview.

I need to ask this question from NO2 Analyser in portion Industrial Gas Analysers of Analytical Instrumentation

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Correct choice is (d) Difference

For explanation I would say: The unmarked block is Difference. Difference between the concentration of NO2 and NO and the concentration of NO2 alone is determined and the result gives the concentration of NO.

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