What happens in case of a choked flow?(a) When flow becomes supersonic at the throat(b) When flow is sonic and mass flow remains constant at the throat despite reducing exit pressure(c) When the exit pressure is reduced to a point where the flow becomes subsonic at throat(d) Normal shock is created at the inlet of the nozzleI got this question by my school teacher while I was bunking the class.Origin of the question is Nozzles topic in section Quasi-One-Dimensional Flow of Aerodynamics

What happens in case of a choked flow?(a) When flow becomes supersonic

1.	What happens in case of a choked flow?(a) When flow becomes supersonic at the throat(b) When flow is sonic and mass flow remains constant at the throat despite reducing exit pressure(c) When the exit pressure is reduced to a point where the flow becomes subsonic at throat(d) Normal shock is created at the inlet of the nozzleI got this question by my school teacher while I was bunking the class.Origin of the question is Nozzles topic in section Quasi-One-Dimensional Flow of Aerodynamics
Answer» Right OPTION is (b) When flow is sonic and mass flow remains constant at the THROAT despite reducing exit pressure The best I can EXPLAIN: When we REDUCE the exit pressure, there comes a point when the Mach number becomes 1 at the throat i.e. the flow is sonic. The mass flow remains constant and the flow becomes frozen upstream of the throat. This condition where after reaching sonic flow at the throat, and despite reducing the exit pressure, the mass flow remains constant is called choked flow.

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