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Rectifiers and Converters

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

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

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Rectifiers and Converters
In which of the following equipment direct current is needed?

Relay
Time switches
All of the listed here
Telephones

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

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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?

Rotary converter
Motor-generator set
Motor converter
Mercury arc rectifier

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Rectifiers and Converters
Which of the following AC. motors is usually used in large motor-generator sets?

Slip ring induction motor
Synchronous motor
Any of the listed here
Squirrel cage induction motor

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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
decelerates
accelerates
none of the listed here

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