What does Variable Geometry consist of?

• A. Fan Variable Geometry (FVG) and Compressor Variable Geometry (CVG).
• B. Front and rear variable geometry only.
• C. Variable nozzle and variable intake geometry.
• D. Variable fuel lines and variable oil lines.

Answer: (A)

Variable Geometry refers to adjustable flow-path components inside the engine that optimize airflow and stability across different speeds and flight conditions. It consists of two parts: Fan Variable Geometry and Compressor Variable Geometry. Fan Variable Geometry adjusts the geometry of the fan-related flow path to keep inlet flow smooth and prevent stalls as conditions change. Compressor Variable Geometry tunes the compressor by changing the angle of the stator vanes, which helps maintain the right pressure rise and avoid surge during throttle and speed variations. These two adjustable elements together define what Variable Geometry encompasses. The other options describe different concepts (such as only front/rear geometry, nozzle or intake geometry, or fluid lines), which do not match the defined components of Variable Geometry.