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In which of the following ways can nitrogen be calibrated for dry gases?

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In which of the following ways can nitrogen be calibrated for dry gases?

(a) By modifying the amplifier

(b) By adjusting the needle valve

(c) By modifying the detector

(d) By changing chopper frequency

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This key question is from Method Based on Ionization of Gases topic in division Industrial Gas Analysers of Analytical Instrumentation

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The correct choice is (b) By adjusting the needle valve

Explanation: Nitrogen can be calibrated for dry gases by adjusting the needle valve. In this way, the error will be compensated.

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