Final answer:
A simple turbine is the type that does not include a heat exchanger, regenerator, or intercoolers, which are used in other more complex turbine types to improve thermal efficiency.
Step-by-step explanation:
The type of turbine that has no heat exchanger, regenerator, or intercoolers is known as a simple turbine. Unlike the other types of turbines listed such as regenerative, combined cycle, and closed cycle, a simple turbine does not incorporate these components that are used for enhancing the thermal efficiency by recycling energy or managing temperature between cycles. Instead, a simple turbine relies on a straightforward thermodynamic process, where the working fluid is directly driven through the turbine to generate power without the inclusion of additional efficiency-improving equipment.