Discussion
The one of the disadvantages of magnetic flowmeters is :
Answer: D
The disadvantage is that it handles only fluids having adequate electrical conductivity.
A magnetic flowmeter works by Faraday's law: a conducting fluid moving through a magnetic field induces a voltage proportional to its velocity, picked up by electrodes. If the fluid is not conductive enough, as with oils, hydrocarbons and pure water, no usable voltage is produced, so the meter cannot be used. The paper's wording is 'adequate electrical conductors'.
Handling slurries, greasy material and corrosive fluids, and causing very low pressure drop because there is no obstruction in the pipe, are advantages of magnetic flowmeters, not disadvantages.
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