What is the approximate percentage of air extracted from the compressor that is mixed with fuel for combustion in a gas turbine?

Correct Answer: Option B — 25%

Approximately 25 percent of the air compressed by the gas turbine is utilized for the primary combustion process. The remaining 75 percent serves as cooling air, which is mixed with the hot combustion gases to lower the turbine inlet temperature to levels compatible with turbine blade metallurgy.