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Rectifiers and Converters

Rectifiers and Converters
A rotary converter operates at a

low power factor
high power factor
None of the listed here
zero power factor

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Rectifiers and Converters
In a three-phase mercury arc rectifiers each anode conducts for

One-third of a cycle
One-fourth of a cycle
Two-third of a cycle
One-half a cycle

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

All of the listed here
magnitude
polarity
phase

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

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

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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.

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

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Rectifiers and Converters
In a phase-shift control method, the phase shift between anode and grid voltages can be achieved by means of

Synchronous generator
Shunt motor
Synchronous motor
Induction regulator

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