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

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

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

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

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