Question 167Motor Plants - Assistant Engineer

The correct answer is B) battery power direct current. Auxiliary diesel engine electric starting motors use battery power direct current (DC) to provide the necessary electrical energy to start the engine. This is a common practice in marine applications, as batteries can store the required electrical charge and deliver the high current needed to crank the engine during startup. The other options are incorrect because: A) 400 cycle per second motor-generator power is not used for starting diesel engines, C) low amperage, high voltage AC power would not have enough current to turn over the engine, and D) alternating current transformers are not directly used to start diesel engines.