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
A magnetic flowmeter is

Capable of measuring the flow rate of slurries and electrolytes
Based on the linear relationship between the fluid flow rate and the induced voltage
All of these
Based on the principle of Faraday's law

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