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PROCESS CONTROL AND INSTRUMENTATION

Process Control and Instrumentation
Pyrometry refers to the measurement of temperature

Which is of higher magnitude
Directly
All of these
With the mercurial thermometer upto 350°C

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Process Control and Instrumentation
For measuring the temperature of a red hot furnace, which is the most suitable instrument?

Bimetallic thermometer
Optical pyrometer
Thermocouple
Platinum resistance thermometer

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

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

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Process Control and Instrumentation
Thermocouple in a thermal well behaves as a true

Multiple first order system
Second order system (overdamped)
Second order system (underdamped)
First order system

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Process Control and Instrumentation
Thermistors are made of

Metal oxides
Ultra pure metals
Iron-copper alloys
Nickel-chromium alloys

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