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Rectifiers and Converters

Rectifiers and Converters
Ageing of a selenium rectifier may change the output voltage by

25 to 30 per cent
None of the listed here
5 to 10 per cent
15 to 20 per cent

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

Variable speed operation
Traction
Electrolysis
Illumination

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Rectifiers and Converters
In a single phase rotary converter the number of slip rings will be

Three
Four
Two
Six

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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 internal efficiency of a mercury arc rectifier depends on

r.m.s. value of current
voltage only
current only
voltage and current

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

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

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