The term used to describe a gas turbine in which the turbine exhaust passes through a cooler and back to the compressor inlet is which of the following?

Correct Answer: Option D — Closed cycle.

Closed cycle gas turbines operate by recirculating the working fluid through a closed loop. The exhaust gas is cooled via a heat exchanger before returning to the compressor inlet. This configuration allows for the use of alternative working gases and prevents atmospheric contaminants from entering the engine's internal components.