Process Control and Instrumentation
Dome temperature of blast furnace stove is most accurately measured by a

Platinum-platinum/rhodium ther-mocuple
Radiation pyrometer
Iron-constantan thermocouple
Platinum resistance thermometer

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

Bode plots of the corresponding open loop transfer function should monotoni-cally decrease
Poles of the closed loop transfer function should lie in the left half of the complex plane
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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