In D.C. generators the cause of rapid brush wear may be A) Severe sparking B) Rough commutator surface C) Imperfect contact D) All of the above Related MCQs: In oocyte development lamp brush chromosome serves as the hub of …… activity? In D.C. generators the pole shoes are fastened to the pole core by In D.C. generators the polarity of the interpoles In D.C. generators on no-load the air gap flux distribution in space is