Question

Consider the following statement related to a horizontal venturimeter:
1. The velocity of flow in the main pipe is greater and the pressure is lesser than that at the throat section.
2.The velocity of flow in the main pipe is lower and the pressure is larger than that at the throat section.
3.The pressure difference between the main pipe and throat section is positive.
4.The pressure difference between the main pipe and throat section is negative.

• A. 1 and 4
• B. 1 and 2
• C. 2 and 3
• D. 3 and 4

Answer 1

The correct option is A 1 and 4

(a)
The cross-section area of main pipe is more than that of throat section. Therefore, from continuity equation velocity of flow in main pipe will be lower than that at the throat section. The flow from main pipe to throat takes place due to pressure gradient and therefore pressure in main pipe is more.