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

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

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Process Control and Instrumentation
Time constant is the

Same as transportation lag
Time taken by the controlled variable to reach 63.2% of its full change
Same as dead time
Time required by the measured variable to reach 63.2% of its ultimate change

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Process Control and Instrumentation
In a second order under damped system, the

Decay ratio (which is the ratio of the sizes of successive peaks) is equal to the reciprocal of overshoot
None of these
Time required for the response of first reach its ultimate value is called the response time
Overshoot (which is a measure of how much the response exceeds the ultimate value) increase with the decrease of damping co-efficient e

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