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Process Control and Instrumentation

Process Control and Instrumentation
According to Bode stability criterian, a system is unstable, if the open loop frequency response exhibits an amplitude ratio exceeding unity at frequency for which phase lag is

0°
45°
90°
180°

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Process Control and Instrumentation
Continuous measurement of specific gravity of a liquid is done by

Displacement meter
Both A and C
Hydrometer
Contact-type electric indicators

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Process Control and Instrumentation
Gas chromatography is used for the measurement of

Flow rate
Concentration
Pressure
Temperature

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Process Control and Instrumentation
Working principle of disappearing filament type optical pyrometer is based on the

Wien's law
Peltier effect
Seebeck effect
Kirchoff's law

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Process Control and Instrumentation
Thermal wells are used in the temperature measurement to

Increase the fidelity
Increase the sensitivity
Reduce measuring lag
Guard against corrosive and oxidising action on thermocouple materials

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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
O₂
CO
N₂

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