MCQ PracticeTo produce cathode spot in a mercury arc rectifierSubject: Electrical EngineeringTopic: Rectifiers And ConvertersAanode is heatedBtube is evacuatedCan auxiliary electrode is usedDlow mercury vapour pressures are usedCorrect Answer: CPractice QuizBack to MCQsRelated MCQsCurrent flows in a circuit whenEighttenths coulomb passes a point in 4 s. The current in amperes isThe unit of electrical charge is the