Process Control and Instrumentation
Time constant is the

Same as transportation lag
Same as dead time
Time taken by the controlled variable to reach 63.2% of its full change
Time required by the measured variable to reach 63.2% of its ultimate change

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

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