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Question

The critical pressure ratio of a convergent nozzle is defined as the ratio of the :

अभिसारी नोजल के क्रांतिक दबाव अनुपात को निम्न के अनुपात के रूप में परिभाषित किया गया है:

A.

inlet pressure to the outlet pressure of the nozzle.

B.

outlet pressure to the inlet pressure of the nozzle only when mass flow rate per unit area is minimum. 

C.

outlet pressure to the inlet pressure of the nozzle.

D.

outlet pressure to the inlet pressure of the nozzle only when mass flow rate per unit area is maximum. 

Answer ( Option D)

outlet pressure to the inlet pressure of the nozzle only when mass flow rate per unit area is maximum. 

Solution

●The critical pressure ratio of a convergent nozzle is defined as the ratio of the outlet pressure to the inlet pressure of the nozzle only when mass flow rate per unit area is maximum.

●The critical pressure ratio indicates the pressure ratio after which mass flow rate cannot be increased further even if exit pressure is reduced. This occurs when Mach number equals 1 at the minimum cross section.

Hence, the correct option is (D).

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