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Process Control and Instrumentation

Process Control and Instrumentation
Sub-zero temperature (< 0°C) can be measured by a constant volume gas thermometer employing

Hydrogen
Helium
None of these
Nitrogen

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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
NO
NO₂
CO₂

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Process Control and Instrumentation
Zirconia probe is used for the measurement of

Speed of a submarine
Humidity of air
% O₂ in flue gas
% CO₂ in flue gas

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Process Control and Instrumentation
Which is the strongest paramagnetic gas?

NO
CO₂
O₂
NO₂

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Process Control and Instrumentation
Identify an unbounded input from inputs whose transfer functions are given below

1
1/S²
1/S
1/(S² + 1)

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Process Control and Instrumentation
Alphatron measures pressure __________ microns.

> 3
< 1
< 3
< 0.1

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