What is a combined cycle, and how does integrating a gas turbine with a steam turbine improve overall efficiency?

• A. A cycle where two turbines run in parallel to share load.
• B. A cycle in which steam is used to purge exhaust.
• C. A cycle that uses waste heat from the gas turbine to generate steam for a steam turbine, increasing overall efficiency by utilizing exhaust heat.
• D. A cycle that vents exhaust directly to atmosphere.

Answer: (C)