Question 33Gas Turbine - Assistant Engineer

The correct answer is C) Centrifugal compressors have a higher compression ratio per stage than an axial flow compressor. This is because centrifugal compressors use the centrifugal force generated by the rotating impeller to increase the pressure of the air, allowing them to achieve a higher compression ratio per stage compared to axial flow compressors. Axial flow compressors, on the other hand, rely on the pressure increase caused by the change in the direction of the airflow, resulting in a lower compression ratio per stage. The other options are incorrect because: A) Centrifugal compressors are not necessarily more expensive to manufacture than axial compressors, as the design and manufacturing process can vary; B) Centrifugal compressors do have a higher compression ratio per stage, not lower; and D) Centrifugal compressors are not necessarily more resistant to foreign object damage (FOD) than axial compressors, as the design and materials used can affect their resistance to FOD.