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Rectifiers and Converters

Rectifiers and Converters
A commutating rectifier consists of commutator driven by

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

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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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Rectifiers and Converters
In a glass bulb mercury arc rectifier the maximum current rating is restricted to

2000 A
500 A
200 A
1500 A

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Rectifiers and Converters
Which of the following rectifiers have been used extensively in supplying direct current for electroplating?

Mechanical rectifiers
Selenium rectifiers
Mercury arc rectifiers
Copper oxide rectifiers

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Rectifiers and Converters
Which of the following mercury arc rectifier will deliver least undulating current?

Single-phase
Three-phase
Two-phase
Six-phase

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Rectifiers and Converters
If cathode and anode connections in a mercury arc rectifier are inter changed

Both ion and electron streams will move in the same direction
The rectifier will operate at reduced efficiency
The rectifier will not operate
Internal losses will be reduced

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