Question

For an isentropic flow ________

(a) Enthalpy = 0

(b) Entropy = 0

(c) Pressure = 0

(d) Temperature = 0

I have been asked this question by my school principal while I was bunking the class.

I need to ask this question from Basic Equations of Compressible Flow in section Compressible Flow of Fluid Mechanics

Answer 1

The correct option is (b) Entropy = 0

Explanation: For an isentropic flow in Tds = dh – vdp, the entropy reduces to zero. That is, the change in entropy value for any isentropic flow (ds)=0. Thus, the correct option is Entropy = 0.