Process Control and Instrumentation
Radiation thermometer can not measure the temperature

Inside a pressure vessel
Of liquid oxygen
Of moving objects at high temperature
Of an object without coming in contact with it

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Process Control and Instrumentation
Routh test

Cannot be used to test the stability of a control system containing transportation lag
Criterion provides information about the actual location of roots
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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