Mechanical Engineering - Steam Nozzles and Turbines - Discussion


The rate of discharge through the nozzle __________ when the exit pressure is gradually reduced.

[A]. remains same
[B]. decreases
[C]. increases

Answer: Option C


No answer description available for this question.

Gautam Mahale said: (Aug 27, 2013)  
Pressure and Discharge are inversely proportional.

Keval Patel said: (Oct 25, 2013)  
Because flow always goes from higher pressure to lower pressure side, and when difference of pressure increases ultimately discharge increase.

Lava said: (Jul 13, 2015)  
Since if pressure decreases then velocity increases so we know that Q=Av. So velocity increases then discharge also increases.

Hitesh said: (Jul 27, 2015)  
Some losses in discharge portion.

Vichu said: (Feb 20, 2016)  
Due to the low cross section area of the nozzle the molecules will try to escape faster so the force of the molecules per area decreases and the speed increases therefore quantity of molecules passing per second increases.

Arun said: (Jun 19, 2016)  
But the discharge is always same.

Umesh Yadav said: (Oct 23, 2016)  
Because the discharge from the nozzle is ((2n/n-1)*pv*n/n+1*) so exit pressure and volume not affected on the discharge/ here PV is inlet pressure and volume.

Lalu said: (Apr 17, 2017)  
Pressure drop at exit increases net pressure, thus discharge increased.

S Bera said: (Jun 29, 2017)  
I think total discharge is same in all portion. Rate of discharged increase.

Rizwan Sheikh said: (Apr 18, 2019)  
The discharge is always constant.

Abhijeet Kumar said: (Oct 1, 2019)  
Discharge of nozzle does not depend upon velocity of steam, it depends only on area of throat and initial pressure and volume.

Kaliraj said: (Oct 10, 2020)  
Why not the option A. If the flow is incompressible, discharge rate depends on the velocity and cross sectional area. If area decreases, it will managed by velocity increment and vice versa.

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