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?

Mercury
Water
Carbon-tetrachloride
Methyl alcohal

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Process Control and Instrumentation
For a feed back control system to be stable, the

Poles of the closed loop transfer function should lie in the left half of the complex plane
Bode plots of the corresponding open loop transfer function should monotoni-cally decrease
Poles of the closed loop transfer function should lie in the right half of the complex plane
Roots of the characteristic equation should be real

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