Question 295Electricity & Electronics - QMED

The correct answer is B) incorrect brush staggering. Incorrect brush staggering can cause uneven wear of the commutator surface on a direct current generator. When the brushes are not properly staggered, they may make uneven contact with the commutator, leading to localized wear and uneven commutator surface. This uneven wear can negatively impact the generator's performance and efficiency. The other options are incorrect because: A) Excessive operation at light load would not directly cause uneven commutator wear. C) Rapid changes in load may cause other issues, but not specifically uneven commutator wear. D) Unequal pole spacing is not a factor that would lead to uneven commutator wear.