Question

The optimum ratio of blade speed to tangential component of jet speed for the de Laval and Parsons turbine are

(a) 1 for both                   

(b) ½ for de Laval turbine and 1 for Parsons turbine

(c) 1 for de Laval turbine and ½ for Parsons turbine

(d) 1/2 for both