Consider the following statements pertaining to one-dimensional isentropic flow in a convergent-divergent passage:
1. A convergent-divergent passage may function as a supersonic nozzle or a venturi depending on the back pressure.
2. At the throat, sonic conditions exist for subsonic or supersonic flow at the outlet.
3. A supersonic nozzle discharges fluid at constant rate even if the exit pressure is lower than the design pressure
4. A normal shock appears in the diverging section of the nozzle if the back pressure is above the design pressure but below a certain minimum pressure for venturi operation.
Which of the statements are correct?
Option (A)
1, 2, 3 and 4
Option (B)
1, 3 and 4
2, 3 and 4
1 and 2
Correct Option: