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Rectifiers and Converters

Rectifiers and Converters
The efficiency of an electrolytic rectifier is nearly

50 %
40 %
60 %
70 %

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Rectifiers and Converters
Mercury, in arc rectifiers, is chosen for cathode because

Its boiling point and specific heat are low
All of the listed here
Its ionization potential is relatively low
Its atomic weight is quite high

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Rectifiers and Converters
The voltage drop between the anode and cathode, of a mercury arc rectifier comprises of the following

anode drop and arc drop
anode drop, cathode drop and arc drop
anode drop and cathode drop
cathode drop and arc drop

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Rectifiers and Converters
In a grid control of mercury arc rectifiers when the grid is made positive relative to cathode, then it the electrons on their may to anode.

decelerates
accelerates
none of the listed here
any of the listed here

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Rectifiers and Converters
The efficiency of the copper oxide rectifier seldom exceeds

85 to 90%
90 to 95%
65 to 75%
80 to 85%

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Rectifiers and Converters
In a rotary converter armature currents are

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

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