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Rectifiers and Converters

Rectifiers and Converters
In a glass bulb mercury arc rectifier the maximum current rating is restricted to

200 A
2000 A
1500 A
500 A

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Rectifiers and Converters
A rotary converter combines the function of

an induction motor and a D.C. generator
None of the listed here
Both of the listed here
a synchronous motor and a D.C. generator

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Rectifiers and Converters
A mercury arc rectifier possesses ________ regulation characteristics

curved line
none of the listed here
exponential
straight line

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Rectifiers and Converters
The efficiency of the copper oxide rectifier seldom exceeds

65 to 75%
90 to 95%
80 to 85%
85 to 90%

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Rectifiers and Converters
The voltage drop at anode, in a mercury arc rectifier is due to

self restoring property of mercury
high ionization potential
energy spent in overcoming the electrostatic field
high temperature inside the rectifier

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

Mercury arc rectifiers
Selenium rectifiers
Copper oxide rectifiers
Mechanical rectifiers

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