The correct answer is C. Diesel engine.
A closed cycle gas turbine is a type of gas turbine that uses a closed loop of air to generate power. The air is compressed, heated, and then expanded to drive a turbine. The exhaust from the turbine is then cooled and recycled back into the system.
An open cycle gas turbine is a type of gas turbine that uses an open loop of air to generate power. The air is compressed, heated, and then expanded to drive a turbine. The exhaust from the turbine is then released into the atmosphere.
A diesel engine is an internal combustion engine that uses compression ignition. The air-fuel mixture is compressed until it ignites spontaneously. Diesel engines are typically used in heavy-duty vehicles and equipment.
A petrol engine is an internal combustion engine that uses spark ignition. The air-fuel mixture is ignited by a spark plug. Petrol engines are typically used in light-duty vehicles and equipment.
Air is the working substance in both closed cycle gas turbines and open cycle gas turbines. However, air is not the working substance in diesel engines. In diesel engines, the working substance is the air-fuel mixture.
The main difference between a closed cycle gas turbine and an open cycle gas turbine is that a closed cycle gas turbine uses a closed loop of air, while an open cycle gas turbine uses an open loop of air. This difference in design results in different performance characteristics for the two types of gas turbines.
Closed cycle gas turbines are typically more efficient than open cycle gas turbines. This is because the air in a closed cycle gas turbine is not exposed to the atmosphere, which means that it does not lose heat as it is compressed and heated.
Open cycle gas turbines are typically less expensive to build than closed cycle gas turbines. This is because open cycle gas turbines do not require a heat exchanger to cool the air after it has been compressed and heated.
Both closed cycle gas turbines and open cycle gas turbines are used in a variety of applications, including power generation, propulsion, and heating.