Mechanical Engineering - Steam Nozzles and Turbines - Discussion

3. 

In a 50% reaction turbine stage, tangential component of absolute velocity at rotor inlet is 537 m/s and the blade velocity is 454 m/s. The power output in kW of steam will be

[A]. 260 kW
[B]. 282 kW
[C]. 296 kW
[D]. 302 kW

Answer: Option B

Explanation:

No answer description available for this question.

Ganesh said: (Oct 3, 2013)  
50% reaction turbine there is one formula,

Work done = Vb (2V1cos alpha-vb)/(1000).

Substitute and we can get it 454/1000(2*537-434) = 282.

Engr Arshad Jamali said: (Dec 4, 2016)  
I think this can be obtained from velocity triangle method.

V Bhanu said: (Feb 6, 2017)  
For 50% reaction turbine;

Workdone = Vb (2V1cos α-vb)/(1000).

Substitute it 454/1000(2 * 537 - 454) = 282.

Maharaja said: (Jul 29, 2017)  
Work done = [454(2 * 537 - 454)]/1000 = 282.

Anjana Yadav said: (Jun 10, 2018)  
What is the value of cos α?

Jitesh said: (Jan 14, 2019)  
Tangential component is given so for absolute it is cos component.

.Bilal said: (Jan 11, 2020)  
What is the value of alpha here?

Pankaj said: (Mar 7, 2020)  
The component v1 cos-alpha is equal to absolute velocity along the component that is 537.

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