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Which of the following statement(s) are/is FALSE? (Note: one or more answers can be selected.) Select one or more: a. Pumps c

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Answer #1

Pumps can be staged in series and parallel.

1. Pumps in series - The head produced by centrifugal pump depends on the rim speed of the impeller.To increase the rim speed,either the rotative speed or the diameter of the impeller or both must be increased. Increasing either of these has the effect of increasing the stress in the implleer material. For this reason it is usually not possible to produce very high speed with one impeller. Normally a pump with a single impeller can be used to deliver the required discharge against a maximum head of 100m. But if the liquid is required to be delivered against a still larger head then it can be done by using two or more pumps in series. pumps in series are employed for delivering a relatively small quantity of liquid against very high head.

2. Pumps in parallel - When a large quantity of liquid is required to be pumped against a relatively small head, then it is not possible for a single pump to deliver the required discharge. In such cases two or more pumps are used which are so arranged that each of these working separately lifts the liquid from a common sump and delivers it to a common collecting pipe through which it is carried to required height. Since in this case each pump delivers the liquid against same head, the arrangement is known as pumps in parallel.Placing pumps in parallel increases the flow rate. it is best to mix two different pumps when placed in parallel to optimize their performance.

At the operating point,the pump curve of two identical pumps do not intersect.

So only (d) option is false.

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