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These typically consist of an engine with a rotary (rotating) air compressor powered by a turbine with the leftover power providing thrust via a propelling nozzle.
Gas turbines are rotary engines that extract energy from a flow of combustion gas. They have an upstream compressor coupled to a downstream turbine with a combustion chamber in-between. In aircraft engines, those three core components are often called the "gas generator. There are many different variations of gas turbines, but they all use a gas generator system of some type.
D Opt
My Opinion goes with Option D
equal
my answer option D
D unpredictable.
Choice "D"
A. equal, ideally.