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Rectifiers and Converters

Rectifiers and Converters
In a mercury arc rectifier______ flow from anode to cathode

electrons
ions
ions and electrons
All of the listed here

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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 ionization potential is relatively low
All of the listed here
Its atomic weight is quite high

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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
maximum grid voltage
critical grid voltage
all of the listed here

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Rectifiers and Converters
In a phase-shift control method, the phase shift between anode and grid voltages can be achieved by means of

Induction regulator
Synchronous motor
Shunt motor
Synchronous generator

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Rectifiers and Converters
If cathode and anode connections in a mercury arc rectifier are inter changed

The rectifier will not operate
Both ion and electron streams will move in the same direction
Internal losses will be reduced
The rectifier will operate at reduced efficiency

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

Variable speed operation
Traction
Illumination
Electrolysis

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