Question

The definition of stagnation pressure can help us calculate the velocity of sound for an incompressible flow. What else do we need for the calculation?

(a) Ambient temperature

(b) Total pressure

(c) Static velocity

(d) Static pressure

I got this question during an internship interview.

Asked question is from Measurement of Velocity in a Compressible Flow in division Normal Shock Waves of Aerodynamics

Answer 1

Correct answer is (d) Static pressure

Explanation: The velocity of sound can be calculated using the Pitot tube which measures the stagnation, also called total pressure and measuring the static pressure as well. There is no need to find temperature. And static velocity is nothing but zero velocity.