The critical value of Mach number for a subsonic airfoil is associated with sharp increase in drag due to local shock formation and its interaction with the boundary layer. A typical value of tills critical Mach number is of the order of

The critical value of Mach number for a subsonic airfoil is associated

1.	The critical value of Mach number for a subsonic airfoil is associated with sharp increase in drag due to local shock formation and its interaction with the boundary layer. A typical value of tills critical Mach number is of the order of
A.	0.4 to 0.5
B.	0.75 to 0.85
C.	1.1 to 1.3
D.	1.5 to 2.0
Answer» D. 1.5 to 2.0

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The critical value of Mach number for a subsonic airfoil is associated with sharp increase in drag due to local shock formation and its interaction with the boundary layer. A typical value of tills critical Mach number is of the order of

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