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

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

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Process Control and Instrumentation
Time constant is the

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
Same as transportation lag
Same as dead time

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