Which statement about the exhaust in a gas turbine is true?

• A. Increase fuel flow.
• B. Cool the intake air.
• C. Provide lubrication.
• D. Remove exhaust gases and complete the cycle.

Answer: (D)

The exhaust’s function is to remove the hot, spent combustion gases after they’ve expanded through the turbine and discharge them to the atmosphere, which completes the Brayton cycle and allows fresh air to enter for the next cycle. This path ensures that only cooled, clean air remains to be compressed in the next cycle, and prevents hot gases from recirculating.

Fuel flow is controlled by the fuel system to meet power needs, not by the exhaust. Cooling the intake air is handled by intake cooling methods and heat exchangers, not the exhaust. Lubrication is provided by the oil system, not the exhaust.