Venturi meter is an application of Bernoulli’s equation. Its basic principle also depends on the Bernoulli equation, which is ____________.

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SSC JE Civil 10 Oct 2023 Shift 1 Official Paper-I
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  1. both velocity of moving fluid and pressure within fluid constant
  2. pressure within the fluid increases and velocity of moving fluid increase
  3. velocity of a moving fluid increases and the pressure within the fluid decreases
  4. both velocity of moving fluid and pressure within fluid increases

Answer (Detailed Solution Below)

Option 3 : velocity of a moving fluid increases and the pressure within the fluid decreases
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Venturi meter:

F2 Madhuri Engineering 20.05.2022 D4

  • It is a device in which pressure energy is converted into kinetic energy and is used to measure the rate of flow through a pipe.
  • The venturi meter basically works on the principle of Bernoulli’s equation.
  • It consists of a converging portion, throat, and diverging portion.
  • When the fluid reaches the converging part then according to the continuity equation when the cross-sectional area decreases then the velocity of the flowing fluid increases.
  • Bernoulli’s equation says that when the velocity of the flowing fluid increases the pressure of the flowing fluid decreases.
  • Hence, the venturi meter has the lowest pressure drop for a given range of flow.
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