A simple gas turbine lacks which component?

• A. Starting Motor
• B. Regenerator
• C. Combustor
• D. Compressor

Answer: (B)

The main idea is that a simple gas turbine runs a straightforward Brayton cycle without heat recovery. Air is compressed, fuel is burned in the combustor, and the hot gases expand through the turbine to produce work. A regenerator (or recuperator) would recover some of the exhaust heat to preheat the incoming air, which improves efficiency but adds extra components and complexity. Since the simple design doesn’t include that heat-exchanging step, the regenerator is the missing piece. The compressor, combustor, and starting means are essential for the basic operation, so they’re present even in a simple gas turbine.