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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 potential drop in the arc, in a mercury arc rectifier, varies

2 V to 3.5 V per cm length of the arc
0.05 V to 0.2 V per cm length of the arc
0.5 V to 1.5 V per cm length of the arc
none of the listed here

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Rectifiers and Converters
In a mercury pool rectifier, the voltage drop across its electrodes

is directly proportional to load
is inversely proportional to load
is almost independent of load current
varies exponentially with the load current

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Rectifiers and Converters
The ignited or auxiliary anode in mercury arc rectifier is made of

Graphite
Boron carbide
Copper
Aluminium

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Rectifiers and Converters
The ionization potential of mercury is approximately

10.4 V
5.4 V
16.4 V
None 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

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

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