GATE Mechanical 2024 | Question: 30

Question

​​​Steady, compressible flow of air takes place through an adiabatic convergingdiverging 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 $\text{E}$ and $\text{F}$ denote the flow conditions just upstream and downstream of the normal shock, respectively, which of the following statement(s) is/are TRUE?

• A. Static pressure at $\text{E}$ is lower than the static pressure at $\text{F}$
• B. Density at $\text{E}$ is lower than the density at $\text{F}$
• C. Mach number at $\text{E}$ is lower than the Mach number at $\text{F}$
• D. Specific entropy at $\text{E}$ is lower than the specific entropy at $\text{F}$