Which of the following options will facilitate the achievement of a very high head (say 30 metres) in case of a centrifugal pump ?
Correct answer: C. Mounting of two or more impellers in series on a single shaft
- A. Increasing the impeller speed and the volute area
- B. Increasing the number of vanes in the impeller
- C. Mounting of two or more impellers in series on a single shaft
- D. Either of A., B. or C.
Explanation
Placing two or more impellers in series adds their heads while keeping the flow rate approximately the same, making multistaging the standard method for obtaining a very high pump head. Increasing speed or vanes can affect head, but does not provide the same reliable high-head arrangement.
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