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JKSSB JE CE 2015 Official Paper

Option 3 : Rate of flow

CT 10: Soil Mechanics

3946

10 Questions
10 Marks
10 Mins

__Explanation:__

An orifice meter provides a simpler and cheaper arrangement** for the measurement of the rate of flow through a pipe**.

- It works on the principle of Bernoulli’s theorem.
- It consists of a flat circular plate that has a circular sharp-edged hole called an orifice, which is concentric with the pipe.
**Venturimeter, Pitot tube, flow nozzle, rotameter, and weir are also flowing measurement devices in which orifice meter, Venturimeter, and flow nozzle work on the principle of constant area variable pressure drop**.- Here the area of obstruction is constant, and the pressure drop changes with flow rate.

__Additional Information__

- Cd is defined as the ratio of the actual flow and the ideal flow and is always less than one.
- For the orifice meter, the coefficient of discharge C
_{d}depends on the shape of the nozzle, the ratio of pipe to nozzle diameter, and the Reynolds number of the flow.