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Rectifiers and Converters

Rectifiers and Converters
In phase-shift control method the control is carried out by varying the of grid voltage.

polarity
All of the listed here
magnitude
phase

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

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

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

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Rectifiers and Converters
The efficiency of an electrolytic rectifier is nearly

60 %
50 %
40 %
70 %

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Rectifiers and Converters
Normally, which of the following is used, when a large-scale conversion from AC. to D.C. power is required?

Motor-generator set
Motor converter
Mercury arc rectifier
Rotary converter

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

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

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