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ISRO2009-10

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At the eye tip of a centrifugal impeller, blade velocity is $200 \: \text{m/s}$ while the uniform axial velocity at the inlet is $150 \: \text{m/s}$. If the sonic velocity is $300 \: \text{m/s}$, then the inlet Mach number of the flow will be

  1. $0.75$
  2. $0.66$
  3. $0.90$
  4. $0.83$
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