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                            Which of the following purposes are served by the volute casing of a centrifugal pump?

1. Increase in the efficiency of the pump.

2. Conversion of part of the pressure head to velocity head.

3. Giving uniform flow of the fluid coming out of the impeller.

Select the correct answer using the codes given below:

A) 1 and 2            

B) 1 and 3

C) 2 and 3            

D) 1, 2 and 3