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Which of the following doesn’t belong to misalignment due to irregularities in nozzle geometry?

Which of the following doesn’t belong to misalignment due to irregularities in nozzle geometry? Correct Answer Nozzle extensions

Nozzle extensions are a means of improving the efficiency of rocket engines by increasing nozzle expansion ratio. It is not an irregularity in nozzle geometry. Protuberances refer to obstructions or protrusions from the nozzle wall. Out-of-round means having an unbalanced spherical or circular form or density.

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