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

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Process Control and Instrumentation
Thermodynamic celcius scale of temperature measurement is

Both A&B Here
Defined on the basis of melting point of ice and evaporation temperature of water vapor
Having an interval of 100° between ice point to steam point
Having an interval of 100° between ice point to steam point

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