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: D. 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. Either of A., B. or C.
- D. Mounting of two or more impellers in series on a single shaft
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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