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Rectifiers and Converters

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

500 A
1500 A
2000 A
200 A

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

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

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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

Shunt motor
Synchronous generator
Induction regulator
Synchronous motor

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Rectifiers and Converters
In which of the following applications, direct current is absolutely essential ?

Electrolysis
Variable speed operation
Illumination
Traction

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Rectifiers and Converters
Which of the following are the applications of D.C. system?

Battery charging work
All of the listed here
Arc welding
Electrolytic and electro-chemical processes

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Rectifiers and Converters
Which of the following methods may be used to convert A.C. system to D.C.?

Rectifiers
All of the listed here
Motor converters
Rotary converters

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