Question

compressible flow:

a converging-diverging nozzle has an area ratio of 5 and a stagnation pressure of 1 MPa. Assume that the gas in the nozzle behaves exactly like air. Which of the following most accurately gives the range of nozzle exit pressures for which the flow is choked, but has subsonic flow at the nozzle exit?

a)990 kPa ?? 1 MPa
b)244 kPa ?? 1 MPa
c)21 kPa ?? 1MPa
d)1 kPa ?? 1 MPa
e)244 kPa ?? 990 kPa
f)21 kPa ?? 990 kPa
g)1 kPa ?? 990 kPa
h)21 kPa ?? 244 kPa
i)1 kPa ?? 244 kPa
j)1 kPa ?? 21 kPa

Answer 1