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Rectifiers and Converters

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

cathode
anode
mercury pool
shell bottom

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

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

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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

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

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

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

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Rectifiers and Converters
The applications of selenium rectifiers are usually limited to potential of

100 V
20 V
30 V
10 V

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

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

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