Process Control and Instrumentation
The function of a transducer is to

Convert the primary signal into a more useful quantity, usually an electric impulse
Modify the input signal
Amplify the input signal
Codify/decodify the input signal

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Process Control and Instrumentation
Select the correct statement from the following.

The phase lag of a pure time delay system decreases with increasing frequency
The amplitude ratio of a pure time delay system increases with frequency
The amplitude ratio of a pure capacity process is inversely proportional to frequency
The frequency response of a pure capacity process is unbounded

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

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

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