Process Control and Instrumentation
To increase the speed of response of a pressure spring liquid or gas expansion thermometer, the clearance space between the thermometer bulb and the thermal well should not be filled with

Mercury
A metal powder or graphite
Air
Oil

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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 right half of the complex plane
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
Bode plots of the corresponding open loop transfer function should monotoni-cally decrease

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