The turbine engine described above is a Single-entry Centrifugal Compressor.
Also known as a Single-Stage Centrifugal compressor, this type of engine combines one impeller with an inlet guide vane that is associated and a diffuser.
It is used for increasing the kinetic energy of the gas with a high-speed impeller. This energy is then converted into heightened pressure within the diffuser. The correct answer, thus, is A.
In order words, they are used for compressing large volumes of gas into small pressures.
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