Computer Programming MCQs

5739 MCQs  (Page 179 of 574)

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The efficiency of an electrolytic rectifier is nearly____________?
A. 80%
B. 70%
C. 60%
D. 40%
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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
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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
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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
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In a mercury arc rectifier, the anode is usually made of_____________?
A. Copper
B. Aluminium
C. Silver
D. Graphite
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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
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In selenium rectifiers efficiencies ranging from _______ to _______ percent are attainable?
A. 25, 35
B. 40, 50
C. 60, 70
D. 75, 85
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The applications of selenium rectifiers are usually limited to potential of_____________?
A. 10 v
B. 30 v
C. 60 v
D. 100 v
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Selenium rectifier can be operated at temperatures as high as____________?
A. 25°c
B. 40°c
C. 60°c
D. 75°c
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The efficiency of the copper oxide rectifier seldom exceeds____________?
A. 90 to 95%
B. 85 to 90%
C. 80 to 85%
D. 65 to 75%
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Word of the Day
22 Jul
Combative
ready or eager to fight or argue.
لڑاکا، متنازع، جھگڑالو

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