Which of the following instruments is used to measure flow on the application of Bernoulli’s theorem

Solution(By Examveda Team)

Bernoulli's theorem states that in an ideal fluid flow, the sum of pressure energy, kinetic energy, and potential energy per unit volume remains constant along any streamline. This principle can be applied to various types of flow measurement devices to determine the flow rate of a fluid. The instruments mentioned in the options are commonly used to measure flow based on Bernoulli's theorem.

Venturimeter: A venturimeter is a device used to measure the flow rate of a fluid in a pipe by utilizing the principle of Bernoulli's theorem. It consists of a converging section followed by a throat and then a diverging section. The pressure difference between the converging and diverging sections is used to determine the flow rate.
Orifice Plate: An orifice plate is another flow measurement device based on Bernoulli's theorem. It consists of a thin plate with a hole (orifice) in it, placed in the pipeline. The pressure difference across the orifice is used to calculate the flow rate.
Pitot Tube: A pitot tube is used to measure fluid velocity based on Bernoulli's theorem. It has a pointed end that faces the fluid flow, and a pressure difference is created between the pointed end and the open end of the tube, which is used to determine the fluid velocity.

All of the above instruments (Venturimeter, Orifice Plate, and Pitot Tube) are utilized to measure flow by applying Bernoulli's theorem. They exploit the relationship between fluid pressure, velocity, and elevation to determine the flow rate accurately.

Therefore, the correct answer is Option D: all of the above.