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Question
Pick out the correct statement pertaining to the flow through a converging-diverging tube.
Options:
A .  The value of Mach number is always unity at the throat
B .  No shock wave develops in the tube when the Mach number at exit is greater than unity
C .  Throughout the converging portion of the tube, the density increases in the downstream direction
D .  None of these
Answer: Option B
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