What are two disadvantages associated with gas turbine engines?

The choice highlighting the large amount of exhaust heat and the requirement of a depot accurately captures two significant disadvantages commonly associated with gas turbine engines.

Gas turbine engines produce a considerable amount of exhaust heat during their operation, which not only contributes to thermal pollution but also necessitates effective management to maintain efficiency and performance. The excessive heat generated can affect nearby components and systems, potentially leading to material degradation if not adequately addressed.

Furthermore, gas turbine engines often require higher levels of maintenance and oversight, which is why the need for a depot is significant. A depot is a facility equipped for the overhauling and repair of gas turbines, where specialized procedures and skilled technicians are required to ensure the engine operates correctly and meets safety standards. This can mean lengthy downtimes for maintenance and repair, making the overall process more complex and costly.

In contrast, while other options such as manufacturing costs, fuel inefficiency, low power output, high vibration, short lifespan, and complicated maintenance may pertain to other technologies or specific situations, they do not encapsulate the critical challenges presented by exhaust heat management and the necessity for specialized depots.