MCQ PracticeThermal efficiency of blast furnace stoves used for heating blast (air) may be about __________ percent.Subject: Chemical EngineeringTopic: Furnace TechnologyA20B40C60D80Correct Answer: DPractice 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