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Rectifiers and Converters

Rectifiers and Converters
Which of the following methods may be used to convert A.C. system to D.C.?

Rotary converters
Rectifiers
Motor converters
All of the listed here

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Rectifiers and Converters
Which of the following rectifiers have been used extensively in supplying direct current for electroplating?

Mechanical rectifiers
Selenium rectifiers
Copper oxide rectifiers
Mercury arc rectifiers

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Rectifiers and Converters
In selenium rectifiers efficiencies ranging from ______ to ______ percent are attainable

40, 50
75, 85
30, 60
20, 30

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Rectifiers and Converters
Selenium rectifier can be operated at temperatures as high as

60°C
75°C
40°C
25°C

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Rectifiers and Converters
The potential drop in the arc, in a mercury arc rectifier, varies

2 V to 3.5 V per cm length of the arc
0.05 V to 0.2 V per cm length of the arc
0.5 V to 1.5 V per cm length of the arc
none of the listed here

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Rectifiers and Converters
It is the_______of the transformer on which the magnitude of angle of overlap depends.

leakage reactance
resistance
capacitance
all of the listed here

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