What is the correct sequence of the combustion cycle in a jet turbine engine?

The correct sequence of the combustion cycle in a jet turbine engine is indeed induction, compression, combustion, expansion, and exhaust. This sequence accurately reflects the fundamental operational phases of the engine.

During the induction phase, outside air is drawn into the engine, which is critical as it provides the necessary oxygen for combustion. Following this, the compression phase occurs where the air is compressed by the engine's compressor, significantly increasing its pressure and temperature. This process is vital because the compression of air enhances the efficiency of combustion.

Next is the combustion phase, where the compressed air mixes with fuel and ignites, leading to a rapid expansion of gases. This expansion generates a high-pressure flow that drives the turbine. The subsequent expansion phase involves the movement of these high-energy gases through the turbine, where they perform work and cause the turbine to spin. Finally, during the exhaust phase, the spent gases exit the engine, allowing for the induction of fresh air to begin the cycle anew.

This order is critical to the operation of jet engines, as it facilitates a continuous and efficient energy conversion process necessary for flight. The other sequences presented do not follow the logical order of airflow and energy transformation that characterizes a jet turbine engine's operation.