26. Aboard ship, single-shaft gas turbines are used mostly as prime movers for which of the following applications?

Single-shaft gas turbines operate most efficiently at a near-constant speed, making them suitable prime movers for electrical generators requiring consistent frequency. Propulsion systems (single- or multi-screw) and auxiliary power units necessitate variable speed operation, which is not ideal for single-shaft turbines. Therefore, generators are the primary application for single-shaft gas turbines aboard ship.