Principles of Flighthard#599
An oblique shock wave differs from a normal shock wave in that:
A
It does not slow the flow
B
It occurs only at subsonic speeds
C
It is inclined at an angle to the flow; the flow is slowed but may remain supersonic behind it
CorrectD
It causes less drag
Explanation
Oblique shocks form at an angle to the flow direction; they decelerate the flow and change its direction, but the flow can remain supersonic downstream.
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