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Describe with a neat sketch, the working of a centrifugal compressor. How do pressure and velocity changes take place in impeller and diffuser?

      (ii) Compare the relative merits and demerits of reciprocating, axial and centrifugal compressors.

(iii) Sketch axial compressor velocity diagrams for a stage. Show that total head pressure rise is given by 

            The notations have the usual meaning.

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