In a centrifugal compressor, which component reduces the velocity and increases the static pressure of the air?

Correct Answer: Option B — Diffuser

Centrifugal compressors utilize a diffuser to convert the high kinetic energy imparted by the impeller into static pressure. By gradually increasing the flow area, the diffuser slows the air velocity according to Bernoulli's principle, effectively transforming dynamic head into the pressure rise required for the Brayton cycle combustion process.