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

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

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Process Control and Instrumentation
In a second order under damped system, the

Overshoot (which is a measure of how much the response exceeds the ultimate value) increase with the decrease of damping co-efficient e
Time required for the response of first reach its ultimate value is called the response time
None of these
Decay ratio (which is the ratio of the sizes of successive peaks) is equal to the reciprocal of overshoot

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Process Control and Instrumentation
Vapour actuated pressure spring thermometer does not require ambient temperature compensation. Ambient temperature compensation is provided in gas or liquid expansion pressure spring thermometer by

Reducing the volume of the capillary to a minimum
Making the volume of thermometer bulb as large as conveniently possible
All of these
Reducing the volume of the receiving element to a minimum

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