Which consequence results when an ultra-high-bypass turbofan engine exceeds max operating altitude?

💡 Explanation

Flameout occurs because at high altitudes, low air density leads to a significantly decreased mass flow rate through the engine. This causes the fuel-air _ratio_ to become excessively lean; therefore the engine can flameout, rather than suffer mechanical damage or icing issues in normally warm air.

• Which outcome is accelerated within polymers exposed to UV radiation in the presence of oxygen?
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• Which outcome occurs when water freezes inside fractured concrete?
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• Which outcome occurs when a high-pressure water pipe undergoes rapid depressurization?