In selenium rectifiers efficiencies ranging from _______ to _______ percent are attainable?
In selenium rectifiers efficiencies ranging from _______ to _______ percent are attainable? A. 25, 35 B. 40, 50 C. 60, 70D. 75, 85
In selenium rectifiers efficiencies ranging from _______ to _______ percent are attainable? A. 25, 35 B. 40, 50 C. 60, 70D. 75, 85
A commutating rectifier consists of commutator driven by___________? A. an induction motorB. a synchronous motor C. a D.C. series motor D. a D.C. shunt motor
In a mercury arc rectifier, the anode is usually made of_____________? A. copper B. aluminium C. silverD. graphite E. tungsten
Which of the following rectifiers have been used extensively in supplying direct current for electroplating ? A. Copper oxide rectifiersB. Selenium rectifiers C. Mercury arc rectifiers D. Mechanical rectifiers E. None of the above
Which of the following is the loss within the mercury arc rectifier chamber ? A. Voltage drop in arc B. Voltage drop at the anode C. Voltage drop at the cathodeD. All of the above
Which of the following rectifiers are primarily used for charging of low voltage batteries from AC supply ? A. Mechanical rectifiers B. Copper oxide rectifiers C. Selenium rectifiersD. Electrolytic rectifiers E. Mercury arc rectifiers
The efficiency of an electrolytic rectifier is nearly____________? A. 80% B. 70%C. 60% D. 40%
The ignited or auxiliary anode in mercury arc rectifier is made of____________? A. graphiteB. boron carbide C. aluminium D. copper