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Rectifiers and Converters

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

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

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Rectifiers and Converters
In mercury arc rectifiers having grid, the arc can be struck between anode and cathode only when the grid attains a certain potential, this potential being known as

maximum grid voltage
non of the listed here
all of the listed here
critical grid voltage

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Rectifiers and Converters
The cathdde voltage drop, in a mercury arc rectifier, is due to

expenditure of energy in overcoming the electrostatic field
expenditure of energy in liberating electrons from the mercury
expenditure of energy in ionization
surface resistance

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Rectifiers and Converters
To produce cathode spot in a mercury arc rectifier

anode is heated
an auxiliary electrode is used
low mercury vapour pressures are used
tube is evacuated

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Rectifiers and Converters
A commutating rectifier consists of commutator driven by

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

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Rectifiers and Converters
Which of the following is reversible in action?

All of the listed here
Motor converter
Rotary converter
Motor generator set

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