question_answer

A three-stage Rateau turbine is designed in such a manner that the first two stages develop equal power with identical velocity diagram while the third one develops more with higher blade speed. In such a multistage turbine the blade ring diameter:

A) Is the same for all the three stages

B) Gradually increases from the first to the third

C) Of the third stage is greater than that of the first two stages,

D) Of the third stage is less than that of the first two stages.