Process Control and Instrumentation
Which of the following temperature measuring instruments need not touch the object whose temperature is being measured?

Radiation/infrared pyrometer
Mercury in glass thermometer
Thermo electric pyrometer
Filled system thermometer

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Process Control and Instrumentation
Routh test

Criterion provides information about the actual location of roots
Criterion is not applicable to systems with polynomial characteristic equation
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

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