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Rectifiers and Converters

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

None of the listed here
Remain same
Less
More

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Rectifiers and Converters
Selenium rectifier can be operated at temperatures as high as

40°C
75°C
25°C
60°C

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Rectifiers and Converters
It is the_______of the transformer on which the magnitude of angle of overlap depends.

leakage reactance
capacitance
resistance
all of the listed here

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

Electrolysis
Illumination
Traction
Variable speed operation

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Rectifiers and Converters
In a rotary converter armature currents are

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

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

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

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