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Rectifiers and Converters

Rectifiers and Converters
Which of the following metals is generally manufactured by electrolysis process?

Copper
Load
Aluminium
Zinc

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Rectifiers and Converters
Mercury, in arc rectifiers, is chosen for cathode because

Its boiling point and specific heat are low
Its atomic weight is quite high
Its ionization potential is relatively low
All of the listed here

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Rectifiers and Converters
In mercury arc rectifiers having grid, the arc can be struck between anode and cathode only when the grid attains a certain potential, this potential being known as

non of the listed here
critical grid voltage
all of the listed here
maximum grid voltage

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Rectifiers and Converters
A synchronous converter can be started

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

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Rectifiers and Converters
A mercury arc rectifier possesses ________ regulation characteristics

straight line
none of the listed here
exponential
curved line

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

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

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