Discussion :: Steam Nozzles and Turbines - Section 1 (Q.No.13)
| 13. |
The efficiency of reaction turbine is maximum when (where α = Angle made by the absolute velocity (V) at inlet) |
| [A]. |
Vb = 0.5 V cos α | | [B]. |
Vb = V cos α | | [C]. |
Vb = 0.5 V2 cos α | | [D]. |
Vb = V2 cos α |
Answer: Option B
Explanation:
No answer description available for this question.
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Saikumar said:
(Mar 12, 2015)
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Velocity ratio for impulse turbine = 0.5 cosθ.
Velocity ratio for reaction turbine = cosθ. |
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Yashfa said:
(Jul 23, 2016)
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| How is this possible? |
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Pal said:
(Aug 19, 2016)
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| The answer should be the option (a). |
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N Suresh said:
(Dec 6, 2016)
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| When the efficiency of reaction turbine is maximum where blade velocity should be half. So that Vb = 0.5 V cos a. |
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Vijay said:
(Dec 22, 2016)
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| Maximum efficiency is option B because (Vb/v)= cos. |
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Biplab said:
(Dec 31, 2016)
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| For reaction turbine, max efficiency condition is cos alpha and in case of impulse turbine (cos alpha)/2. |
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K910 said:
(Feb 7, 2020)
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| The answer is correct for rxn it is U/V=cos alpha for impulse it is cos(alpa)/2. |
