Process Control and Instrumentation
The closed loop pole of a stable second order system could be

Complex conjugate with positive real parts
One real positive and the other real negative
Both real and negative
Both real and positive

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Process Control and Instrumentation
Accurate temperature measurement performance of a radiation pyrometer can not be affected, if the

Enhancement or attentuation of redia-tion occurs in the sighting path
Object and surrounding are at almost the same temperature
Object has varying emissivity
Object is transparent

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