For a Parson's reaction turbine if a, and \[{{\alpha }_{2}}\] are fix angles at inlet and exit respectively and \[{{\beta }_{1}}\] and \[{{\beta }_{2}}\] are the moving blade angles at entrance and respectively, then:

• A. \[{{\alpha }_{1}}={{\alpha }_{2}}\,\,and\,\,{{\beta }_{1}}={{\beta }_{2}}\]
• B. \[{{\alpha }_{1}}={{\alpha }_{1}}\,\,and\,\,{{\alpha }_{2}}={{\beta }_{2}}\]
• C. \[{{\alpha }_{1}}<{{\beta }_{1}}\,\,and\,\,{{\alpha }_{2}}={{\beta }_{2}}\]
• D. \[{{\alpha }_{1}}={{\beta }_{2}}\,\,and\,\,{{\beta }_{1}}={{\alpha }_{2}}\]