Discussion
A venturi meter is used for measuring :
Answer: A
A venturi meter is used for measuring the flow rate.
The venturi meter has a converging section, a throat and a gradually diverging section. The fluid speeds up and its pressure falls at the throat; the pressure difference between the inlet and the throat, read on a manometer, gives the discharge through Bernoulli's and the continuity equations, \(Q = C_{d} A_{1}A_{2}\sqrt{2gh}/\sqrt{A_{1}^{2} - A_{2}^{2}}\).
It does measure a pressure drop, but only as the means of finding the discharge, which is its purpose. Point velocity is measured with a pitot tube, and total head is not what the device is built to give.
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