• # question_answer At the eye tip of a centrifugal impeller, blade velocity is 200 m/s while the uniform axial velocity at the inlet is 150 m/s. If the sonic velocity is 300 m/s, then the inlet Mach number of the flow will be: A) 0.50                             B) 0.66C) 0.83                             D) 0.87

Mach number, $M=\frac{axial\,\,velocity\,\,at\,\,inlet}{sonic\,\,velocity}$ $=\frac{150}{300}=0.5$