Which two types of gas turbine engines are primarily designed to produce torque?

The focus of the question is on identifying gas turbine engine types designed primarily to produce torque, which is essential for propelling various types of aircraft and vehicles. The correct option highlights turbojet and turbofan engines.

Turbojet engines generate thrust primarily by accelerating air through the combustion process, producing high speeds that propel the aircraft forward. While their main function is thrust generation, they can also provide some torque when integrated with additional systems that harness this ability for specific applications.

Turbofan engines, on the other hand, are designed with a large fan at the front that draws in air, with a significant portion of this air bypassing the core of the engine. This design allows turbofans to produce not just thrust but also useful torque, particularly in situations where additional mechanical power is needed, such as in larger transport aircraft or for auxiliary systems.

In contrast, other engine types like turboprops are specifically designed to maximize torque output, making them a preferred choice for providing mechanical power to propellers. However, they do not feature prominently alongside the turbojet, which is primarily thrust-oriented.

Therefore, the answer communicates a valid interpretation of the roles played by turbojet and turbofan engines in the context of torque production, linking them to varying operational characteristics