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The local Mach number at a point on the airfoil reaches 1 for critical Mach number.

The local Mach number at a point on the airfoil reaches 1 for critical Mach number. Correct Answer True

For a freestream Mach number, the local Mach number at the airfoil varies based on the pressure distribution. At the upper surface, there is a point with minimum pressure where the local Mach number is maximum. Thus for critical Mach number, this local Mach number at the upper surface of the airfoil is unity.

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