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Process Control and Instrumentation

Process Control and Instrumentation
Which of the following is the dynamic characteristics of an instrument?

Sensitivity
Dead zone
Reproducibility
Fidelity

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Process Control and Instrumentation
Magnetic flowmeters are generally not used for the velocity/flow measurement of hydrocarbons due to their

Low flash point
Low electrical conductivity
High viscosity index
Low thermal conductivity

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Process Control and Instrumentation
Measurement of sub-zero Celcius temperature in industry is done most commonly by

Gas thermometers
Bi-metallic thermometers
Resistance thermometers
Thermocouples

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Process Control and Instrumentation
Paramagnetism method is not used for the composition determination of __________ in gases.

Any of these
Oxides of nitrogen
Oxygen
Carbon dioxide

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Process Control and Instrumentation
Which of the following is a desirable characteristic of an instrument?

High drift
Poor reproducibility
High fidelity
High measuring lag

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Process Control and Instrumentation
Phase margin is equal to

180° - phase lag
Phase lag + 90°
Phase lag + 180°
Phase lag - 180°

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