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In all reaction turbine, maximum efficiency is obtained if the:
1. blade angle is 90° at the inlet
2. angle of absolute velocity vector at the outlet is 90° 
3. guide vane angle is 90° 
4. blade angle is 90° at the outlet

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Correct Answer - Option 2 : angle of absolute velocity vector at the outlet is 90° 

Explanation:

The maximum efficiency of a reaction turbine is given by:

\(\eta = \frac{{2{{\cos }^2}α }}{{1 + {{\cos }^2}α }}\)

So for the maximum efficiency α = 90° 

where, 

α = angle of the absolute velocity vector at the outlet.

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