Question

In a venturi duct, the pressure at throat is __________

(a) lower than ambient pressure

(b) equal to ambient pressure

(c) greater than ambient pressure

(d) 0

This question was addressed to me during an online interview.

This intriguing question originated from Incompressible Flow in Duct topic in section Inviscid & Incompressible Flow of Aerodynamics

Answer 1

Right option is (a) lower than ambient pressure

To explain: It is the characteristics of the venturi duct that the pressure at the throat is lower than the pressure at the inlet (ambient pressure). Because of this characteristic, it has many applications in the aerodynamics.