Question:
Which of the following does not work on the principle of Bernoulli’s equation ?
Which of the following does not work on the principle of Bernoulli’s equation ?
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Remember that Venturimeters, Orificemeters, and Pitot tubes are "flow measurement" devices that rely on fluid movement and Bernoulli's equation, while a Bourdon tube is a "static pressure" gauge.
Updated On: Jul 21, 2026
- Orificemeter
- Venturimeter
- Pitot tube
- Bourdon tube
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Verified By Collegedunia
The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept:
Bernoulli's equation represents the principle of conservation of energy for flowing fluids.
It states that the sum of pressure energy, kinetic energy, and potential energy remains constant along a streamline.
Step 2: Detailed Explanation:
Let us analyze how each device operates:
- Orificemeter (A) and Venturimeter (B): These are flow-rate measuring devices.
By restricting the flow area, they increase fluid velocity and cause a local drop in pressure.
Measuring this pressure difference allows us to calculate the flow rate using Bernoulli's equation.
- Pitot tube (C): This device measures fluid velocity by converting kinetic energy into pressure energy at a stagnation point, which directly utilizes Bernoulli's equation.
- Bourdon tube (D): This is a mechanical device used to measure static fluid pressure.
It consists of a curved, hollow, metallic tube closed at one end.
When pressurized, the tube tends to straighten out.
This mechanical deflection is linked to a needle on a dial to display the pressure.
It operates on the principle of elastic deformation under pressure, not on Bernoulli's fluid flow equation.
Therefore, the Bourdon tube does not work on Bernoulli's principle.
Step 3: Final Answer:
The device that does not work on Bernoulli's principle is the Bourdon tube.
Bernoulli's equation represents the principle of conservation of energy for flowing fluids.
It states that the sum of pressure energy, kinetic energy, and potential energy remains constant along a streamline.
Step 2: Detailed Explanation:
Let us analyze how each device operates:
- Orificemeter (A) and Venturimeter (B): These are flow-rate measuring devices.
By restricting the flow area, they increase fluid velocity and cause a local drop in pressure.
Measuring this pressure difference allows us to calculate the flow rate using Bernoulli's equation.
- Pitot tube (C): This device measures fluid velocity by converting kinetic energy into pressure energy at a stagnation point, which directly utilizes Bernoulli's equation.
- Bourdon tube (D): This is a mechanical device used to measure static fluid pressure.
It consists of a curved, hollow, metallic tube closed at one end.
When pressurized, the tube tends to straighten out.
This mechanical deflection is linked to a needle on a dial to display the pressure.
It operates on the principle of elastic deformation under pressure, not on Bernoulli's fluid flow equation.
Therefore, the Bourdon tube does not work on Bernoulli's principle.
Step 3: Final Answer:
The device that does not work on Bernoulli's principle is the Bourdon tube.
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