Why is a gas turbine considered to operate on the Brayton cycle?

Correct Answer: Option D — Combustion occurs with no increase in pressure.

The ideal Brayton cycle assumes that combustion occurs at constant pressure. While real-world engines experience minor pressure drops due to friction and flow losses, the theoretical cycle is defined by isobaric heat addition, distinguishing it from the constant-volume heat addition characteristic of the Otto cycle used in reciprocating engines.