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Rectifiers and Converters

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

Traction
Illumination
Electrolysis
Variable speed operation

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Rectifiers and Converters
The metal rectifiers are preferred to valve rectifiers due to which of the following advantages ?

Both of the listed here
They do not require any voltage for filament heating
None of the listed here
They are mechanically strong

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Rectifiers and Converters
In a mercury arc rectifier positive ions are attracted towards

cathode
shell bottom
mercury pool
anode

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Rectifiers and Converters
A commutating rectifier consists of commutator driven by

A synchronous motor
An induction motor
A D.C. shunt motor
A D.C. series motor

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

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

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

electrons
ions and electrons
All of the listed here
ions

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