Question

If the volume of air passing through a carburetor venturi is reduced, the pressure at the venturi throat will _______.

1) increase
2) decrease
3) remain the same
4) cannot be determined

Answer 1

When the volume of air passing through a carburetor venturi is reduced, the pressure at the venturi throat will decrease.

Step-by-step explanation:

According to the principles of fluid dynamics, when the volume of air passing through a venturi in a carburetor is reduced, the pressure at the venturi throat will decrease.

This is because as the volume of air passing through the venturi decreases, the cross-sectional area of the venturi decreases. According to Bernoulli's equation, when the velocity of a fluid increases, the pressure decreases. Therefore, when the volume of air passing through the venturi decreases, the velocity of the air increases and the pressure decreases at the venturi throat.

For example, imagine a garden hose with a nozzle. If you partially block the nozzle, the water coming out of the nozzle will have a higher velocity and lower pressure compared to when the nozzle is not blocked. The same concept applies to the airflow through a venturi in a carburetor.