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The minimum possible angle an oblique shock can make with the oncoming flow is

  • A.Forty-five degrees
  • B.Ninety degrees
  • C.The Mach angle
  • D.Zero degrees

Answer: C

As the deflection tends to zero the shock weakens to a Mach wave, whose angle is the Mach angle. That is the lower limit. The upper limit is ninety degrees, at which the oblique shock has become a normal shock and the deflection has fallen back to zero from the other direction.

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