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Rectifiers and Converters

Rectifiers and Converters
In a mercury arc rectifier characteristic blue luminosity is due to

ionization
electron streams
high temperature
colour of mercury

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Rectifiers and Converters
Which of the following is the loss within the mercury arc rectifier chamber?

Voltage drop at the cathode
Voltage drop at the anode
Voltage drop in arc
All of the listed here

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Rectifiers and Converters
In selenium rectifiers efficiencies ranging from ______ to ______ percent are attainable

75, 85
40, 50
20, 30
30, 60

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

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

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Rectifiers and Converters
A commutating rectifier consists of commutator driven by

An induction motor
A D.C. shunt motor
A D.C. series motor
A synchronous motor

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

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

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