Discussion
A gas turbine cycle with heat exchange and reheating improves :
Answer: D
It improves both thermal efficiency and specific power output.
Heat exchange (regeneration) uses the hot turbine exhaust to preheat the compressed air before it enters the combustion chamber, so less fuel is needed for the same turbine inlet temperature and the thermal efficiency rises.
Reheating the gas between turbine stages raises the work obtained per kilogram of air, which increases the specific power output. On its own, reheating tends to lower efficiency because the exhaust leaves hotter, but with a heat exchanger that extra exhaust heat is recovered, so the combination improves both. That rules out the options naming only one or neither.
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