Consider Gas Flow Through a Converging-Diverging Nozzle

Multiple Choice

Consider gas flow through a converging-diverging nozzle. Of the five statements below, select the one that is incorrect:

A) The fluid velocity at the throat must be at or below the speed of sound.
B) If the fluid velocity at the throat is below the speed of sound, the diverging section can still accelerate the fluid to sepersonic velocities.
C) If the fluid enters the diverging section with a Mach number greater than one and no shock occurs, the flow at the nozzle exit will be supersonic.
D) There will be no flow through the nozzle if the back pressure equals the stagnation pressure.
E) The fluid velocity decreases, the entropy increases, and stagnation enthalpy remains constant during flow through a normal shock.