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Rectifiers and Converters

Rectifiers and Converters
The applications of selenium rectifiers are usually limited to potential of

30 V
10 V
20 V
100 V

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Rectifiers and Converters
In a grid control of mercury arc rectifiers when the grid is made positive relative to cathode, then it the electrons on their may to anode.

none of the listed here
accelerates
decelerates
any of the listed here

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Rectifiers and Converters
With a motor converter it is possible to obtain D.C. voltage only upto

600-800 V
1700-2000 V
1000-1200 V
200-100 V

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

Mechanical rectifiers
Copper oxide rectifiers
Mercury arc rectifiers
Selenium rectifiers

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Rectifiers and Converters
A synchronous converter can be started

from D.C. side as D.C. motor
from A.C. side as induction motor
All of the listed here
by means of a small auxiliary motor

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Rectifiers and Converters
When a rectifier is loaded which of the following voltage drops take place ?

Voltage drop in resistance of transformer and smoothing chokes
All of the listed here
Arc voltage drop
Voltage drop in transformer reactance

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