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Question
What is the drop in enthalpy (in kJ/kg) for a steam whistle which is perfectly insulated and does not work has an exit velocity of steam at 40 m/sec?
एक भाप सीटी के लिए एन्थैल्पी में गिरावट (केजे/किग्रा में) क्या है जो पूरी तरह से इंसुलेटेड है और काम नहीं करती है और भाप का निकास वेग 40 मीटर/सेकंड है?
A.

  0.8

B.

 8


C.

 80 

D.

 800

Answer ( Option A)

  0.8

Solution

Given :

Exit velocity of steam) =  40 m/s  

In case of nozzle :

&Key Points:-

(i)        For nozzle :

           Exit velocity,

           Since, 

           Therefore, 

          

(ii)       For diffuser : 

           Inlet velocity, 




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