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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.?

Rectifiers
Rotary converters
All of the listed here
Motor converters

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Rectifiers and Converters
A synchronous converter can be started

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

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Rectifiers and Converters
Which of the following are the applications of D.C. system?

Electrolytic and electro-chemical processes
All of the listed here
Arc welding
Battery charging work

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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
energy spent in overcoming the electrostatic field
high ionization potential
high temperature inside the rectifier

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Rectifiers and Converters
Normally, which of the following is used, when a large-scale conversion from AC. to D.C. power is required?

Motor converter
Mercury arc rectifier
Motor-generator set
Rotary converter

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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.

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

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