Which of these conditions is not applicable for choked flow?

A)
Mass flow is constant
B)
The Mach number at the throat is zero
C)
Exit pressure is same as the inlet pressure
D)
Exit pressure is lower than inlet pressure

Correct Answer :   Exit pressure is same as the inlet pressure


Explanation : Choked flow is a condition where the exit pressure is lower than inlet pressure to a point where the flow after throat section becomes frozen. After this, despite lowering the value of exit pressure, inlet pressure has no effect. The mass flow remains constant despite reducing the exit pressure.