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Which of the following will aid in the selection of smaller combustion chamber volume during its design?

Which of the following will aid in the selection of smaller combustion chamber volume during its design? Correct Answer Possibility for complete combustion

If there are means of achieving complete combustion, then the size of the combustion chamber may be reduced. Other than that, using highly reactive propellants (with adequate safety measures), having high chamber pressure and using injectors with good mixing will also act as factors for the selection of a smaller combustion chamber.

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