Process Control and Instrumentation
Temperature of molten pig iron (1450°C) and molten slag (1500°C) flowing out of a blast furnace is measured by a/an

Radiation pyrometer
Chromel-alumel thermocouple
Either B or C
Optical pyrometer

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Process Control and Instrumentation
Routh test

Criterion provides information about the actual location of roots
Cannot be used to test the stability of a control system containing transportation lag
Can not determine as to how many roots of the characteristics equation have positive real roots
Criterion is not applicable to systems with polynomial characteristic equation

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