A. 25, 35
B. 40, 50
C. 60, 70
D. 75, 85
0
A commutating rectifier consists of commutator driven by___________?
0
In a mercury arc rectifier, the anode is usually made of_____________?
A. an induction motor
B. a synchronous motor
C. a D.C. series motor
D. a D.C. shunt motor
0
Which of the following rectifiers have been used extensively in supplying direct current for electroplating ?
A. copper
B. aluminium
C. silver
D. graphite
E. tungsten
0
Which of the following is the loss within the mercury arc rectifier chamber ?
A. Copper oxide rectifiers
B. Selenium rectifiers
C. Mercury arc rectifiers
D. Mechanical rectifiers
E. None of the above
0
Which of the following rectifiers are primarily used for charging of low voltage batteries from AC supply ?
A. Voltage drop in arc
B. Voltage drop at the anode
C. Voltage drop at the cathode
D. All of the above
0
The efficiency of an electrolytic rectifier is nearly____________?
A. Mechanical rectifiers
B. Copper oxide rectifiers
C. Selenium rectifiers
D. Electrolytic rectifiers
E. Mercury arc rectifiers
0
The ignited or auxiliary anode in mercury arc rectifier is made of____________?
A. 80%
B. 70%
C. 60%
D. 40%
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