Process Control and Instrumentation
Which of the following is not classified as a thermo electric pyrometer

Resistance thermometer
Thermocouple
Optical pyrometer (disappearing filament type)
Radiation pyrometer

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Process Control and Instrumentation
Time constant is the

Same as dead time
Time taken by the controlled variable to reach 63.2% of its full change
Same as transportation lag
Time required by the measured variable to reach 63.2% of its ultimate change

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