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

Pitot tube
Magnetic flowmeter
Flow nozzle type flowmeter
Turbine flowmeter

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Process Control and Instrumentation
A magnetic flowmeter is

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

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