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Rectifiers and Converters

Rectifiers and Converters
In which of the following applications, direct current is absolutely essential ?

Electrolysis
Traction
Variable speed operation
Illumination

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

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

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Rectifiers and Converters
In a single phase rotary converter the number of slip rings will be

Four
Two
Six
Three

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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
by means of a small auxiliary motor
All of the listed here

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

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
2 V to 3.5 V per cm length of the arc

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

expenditure of energy in overcoming the electrostatic field
expenditure of energy in liberating electrons from the mercury
expenditure of energy in ionization
surface resistance

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