Question 481Electricity & Electronics - Assistant Engineer

The correct answer is A) reverse current relay. A reverse current relay is used to prevent a DC generator from becoming motorized when paralleling is accomplished without an equalizer. When generators are paralleled without an equalizer, there is a risk of circulating current between the generators, which can cause one generator to become motorized and act as a motor rather than a generator. The reverse current relay detects this reverse flow of current and automatically disconnects the generator from the system, preventing it from being motorized. The other options are incorrect because they do not specifically address the issue of preventing a DC generator from becoming motorized when paralleling without an equalizer. Overspeed trip, back pressure trip, and governor controls are not directly related to this specific problem.