Question 2459 Deck General

The correct answer is B) theoretically available. Indicated horsepower refers to the theoretical maximum power that can be produced by the engine of a towing vessel, based on its design and specifications. This power is not necessarily the same as the actual power delivered at the vessel's shaft, as there are various losses and inefficiencies that occur in the engine and drivetrain. The indicated horsepower represents the upper limit of the engine's potential power output, rather than the measured power output. The other options are incorrect because: A) measuring power by dynamometer would provide the actual power output, not the theoretical maximum; C) the power developed at the shaft is the actual power output, not the indicated horsepower; and D) measuring power on a test bed would also provide the actual power output, not the theoretical maximum.