Process Control and Instrumentation
Continuous flue gas analyser makes use of paramagnetic properties of some of its constituents, which move towards the strongest part of the magnetic field thus displacing diamagnetic gases. Which of the following gases is diamagnetic?

O₂
NO₂
NO
CO₂

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Process Control and Instrumentation
Select the correct statement from the following.

The phase lag of a pure time delay system decreases with increasing frequency
The amplitude ratio of a pure time delay system increases with frequency
The frequency response of a pure capacity process is unbounded
The amplitude ratio of a pure capacity process is inversely proportional to frequency

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