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Which risk increases when continuously throttling a cryogenic rocket engine?

A)Combustion instability within the engine✓
B)Increased heat convection into propellant
C)Turbopump overspeed due to low load
D)Augmented nozzle erosion from backflow

💡 Explanation

Combustion instability may result from throttling because the reduced mass flow rate decreases the damping of acoustic oscillations inside the combustion chamber impacting stable deflagration; therefore instability grows rather than reaching equilibrium at a different operating pressure.

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