Process Control and Instrumentation
Flow rate of those fluids which are insensitive to changes in their density, viscosity or flow velocity profile can be best measured by a

Magnetic flowmeter
Pitot tube
Flow nozzle type flowmeter
Turbine flowmeter

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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
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
Poles of the closed loop transfer function should lie in the right half of the complex plane

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