Which component provides the first stage of compression?

• A. Gas Generator High Pressure Section
• B. Axial Compressor Assembly
• C. Power Turbine
• D. Reduction Gearbox

Answer: (B)

In a gas turbine, air is compressed in stages within the compressor, with the initial rise in pressure coming from the first rotor-stator stage. The axial compressor assembly is the part that provides this first stage of compression, beginning to raise air pressure before it passes through the higher-pressure stages. The power turbine sits on the exhaust side and drives the compressor, while the reduction gearbox handles speed/drive for accessories; the high-pressure section adds more compression after the initial stage. So the first stage of compression comes from the axial compressor assembly.