question_answer

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) \[{{\alpha }_{1}}={{\beta }_{2}}\,\,and\,\,{{\beta }_{1}}={{\alpha }_{2}}\]