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Which of the following statements is incorrect ? (a) A shock wave occurs in divergent section of a nozzle when the compressible flow changes abruptly from supersonic to subsonic state (b) A plane moving at supersonic state is not heard by the stationary observer on the ground until it passes him because zone of disturbance in Mach cone trails behind the plane (c) A divergent section is added to a convergent nozzle to obtain supersonic velocity at the throat (d) none of the above. |
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Answer» (c) A divergent section is added to a convergent nozzle to obtain supersonic velocity at the throat |
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