Process Control and Instrumentation
Out of the following temperature measuring instruments, the measurement accuracy will be minimum for the

Alcohol filled thermometer
Optical pyrometer
Iron-constantan thermocouple
Mercury in glass thermometer

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

Roots of the characteristic equation should be real
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

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