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Process Control and Instrumentation

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

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

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Process Control and Instrumentation
Thermal conductivity based continuous flue gas analyser makes use of varying thermal conductivity of the constituents of flue gases. Which of the following constituents of flue gases has the maximum thermal conductivity?

CO₂
N₂
O₂
CO

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Process Control and Instrumentation
The frequency at which maximum amplitude ratio is attained is called the __________ frequency.

Resonant
Natural
Cross-over
Corner

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Process Control and Instrumentation
Composition of alloys can be determined by

Polarograph
Chromatograph
Refractrometer
None of these

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Process Control and Instrumentation
Which of the following filled system expansion thermometers has the lowest positive temperature measurement capability?

Fused metal (Na or K) in steel thermometer
Nitrogen in steel thermometer
Alcohol in glass thermometer
Mercury in glass thermometer

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Process Control and Instrumentation
Positioning controllers are used for

Low loads
Flow rate changes
Temperature changes
High loads

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