Process Control and Instrumentation
Pick out the first order system from among the following.

Damped vibrator
Interacting system of two tanks in series
Mercury in glass thermometer kept in boiling water
Non-interacting system of two tanks in series

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

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

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