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Consider the following statements

         The nozzle efficiency depends on

          1. Material of the nozzle

         2. Size and shape of the nozzle

         3. Mach number of the nozzle

         4. Reynolds number of flow

         Which of these statements are correct?

         (a) 1 and 2 only              (b) 1 and 3 only           (c) 1, 2 and 4               (d) 2, 3 and 4

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