In selenium rectifiers efficiencies ranging from _______ to _______ percent are attainable?
A. 25, 35
B. 40, 50
C. 60, 70
D. 75, 85
Rectifiers and Converters
A commutating rectifier consists of commutator driven by___________?
A commutating rectifier consists of commutator driven by___________?
A. an induction motor
B. 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_____________?
In a mercury arc rectifier, the anode is usually made of_____________?
A. copper
B. aluminium
C. silver
D. graphite
E. tungsten
Which of the following rectifiers have been used extensively in supplying direct current for electroplating ?
Which of the following rectifiers have been used extensively in supplying direct current for electroplating ?
A. Copper oxide rectifiers
B. 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 ?
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 cathode
D. All of the above
Which of the following rectifiers are primarily used for charging of low voltage batteries from AC supply ?
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 rectifiers
D. Electrolytic rectifiers
E. Mercury arc rectifiers
The efficiency of an electrolytic rectifier is nearly____________?
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____________?
The ignited or auxiliary anode in mercury arc rectifier is made of____________?
A. graphite
B. boron carbide
C. aluminium
D. copper