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Fluid Mechanics and Thermal Sciences Question on Basics of compressible fluid flow

Steady, compressible flow of air takes place through an adiabatic converging- diverging nozzle, as shown in the figure. For a particular value of pressure difference across the nozzle, a stationary normal shock wave forms in the diverging section of the nozzle. If E and F denote the flow conditions just upstream and downstream of the normal shock, respectively, which of the following statement(s) is/are TRUE?
Steady, compressible flow of air takes place through an adiabatic converging- diverging nozzle

A

Static pressure at E is lower than the static pressure at F

B

Density at E is lower than the density at F

C

Mach number at E is lower than the Mach number at F

D

Specific entropy at E is lower than the specific entropy at F

Answer

Static pressure at E is lower than the static pressure at F

Explanation

Solution

The correct option is (A): Static pressure at E is lower than the static pressure at F, (B): Density at E is lower than the density at F and (D): Specific entropy at E is lower than the specific entropy at F