Process Control and Instrumentation
Working principle of mercury in glass thermometer is based on volumetric expansion of mercury with increase in temperature. Which of the following undergoes minimum volumetric expansion for a given temperature change?

Methyl alcohal
Water
Carbon-tetrachloride
Mercury

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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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