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Rectifiers and Converters

Rectifiers and Converters
In a rotary converter armature currents are

partly a.c. and partly d.c.
a.c. only
d.c. only
None of the listed here

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Rectifiers and Converters
A rotary converter combines the function of

Both of the listed here
an induction motor and a D.C. generator
None of the listed here
a synchronous motor and a D.C. generator

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Rectifiers and Converters
In a rotary converter I2R losses as compared to a D.C. generator of the same size will be

Less
More
None of the listed here
Remain same

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Rectifiers and Converters
The advantage of mercury arc rectifier is that

it has high efficiency
it is light in weight and occupies small floor space
it is comparatively noiseless
All 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

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

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Rectifiers and Converters
To produce cathode spot in a mercury arc rectifier

tube is evacuated
anode is heated
low mercury vapour pressures are used
an auxiliary electrode is used

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