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Rectifiers and Converters

Rectifiers and Converters
The ionization potential of mercury is approximately

10.4 V
5.4 V
16.4 V
None of the listed here

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

Rectifiers
Rotary converters
Motor converters
All of the listed here

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Rectifiers and Converters
The internal efficiency of a mercury arc rectifier depends on

r.m.s. value of current
voltage only
voltage and current
current only

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

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

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Rectifiers and Converters
Which of the following mercury arc rectifier will deliver least undulating current?

Single-phase
Six-phase
Three-phase
Two-phase

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Rectifiers and Converters
In a three-phase mercury arc rectifiers each anode conducts for

Two-third of a cycle
One-third of a cycle
One-half a cycle
One-fourth of a cycle

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