Consider the following statements for specific speed:
1. The optimum efficiency of a hydraulic machine depends on its specific speed
2. For the same power, a turbo machine running at higher specific speed will be smaller in size.
3. Width – diameter ratio of a centrifugal pump increases with the increase in specific speed.
Which of the statements given above is/are correct?
(a) 1 only (b) 1 and 2 only
(c) 2 and 3 only (d) 1, 2 and 3