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Which outcome occurs when hot exhaust gases from a turbine engine rapidly expand through a converging-diverging nozzle?

A)Isentropic cooling and supersonic flow.
B)Increased heat transfer efficiency.
C)Reduced nozzle erosion rates.
D)Decreased compressor stall margin.

💡 Explanation

Isentropic cooling and supersonic flow occur because adiabatic expansion through the nozzle leads to a decrease in temperature, and the de Laval nozzle design causes the Mach number to exceed 1. Therefore, supersonic flow results, rather than other thermal effects, due to directed acceleration.

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