Question 262Electricity & Electronics - 1st Asst/Chief

The correct answer is A) The synchronous propulsion motors are under-excited. In an AC diesel-electric drive ship with synchronous propulsion motors, the power factor of 0.7 lagging indicates that the system is operating with a lagging power factor. This means that the reactive power is leading the active power, which is typically caused by an under-excited synchronous motor. The other options are incorrect because: B) The excitation status of the synchronous motor cannot be determined from the given information. C) Over-excited synchronous motors would result in a leading power factor, not a lagging power factor. D) Normally excited synchronous motors would result in a power factor closer to unity, not 0.7 lagging.