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Rectifiers and Converters

Rectifiers and Converters
In a mercury arc rectifier, the anode is usually made of

silver
copper
aluminium
graphite

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Rectifiers and Converters
Which of the following rectifiers are primarily used for charging of low voltage batteries from AC. supply?

Electrolytic rectifiers
Selenium rectifiers
Copper oxide rectifiers
Mechanical rectifiers

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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
Induction regulator
Synchronous motor

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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

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

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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
In which of the following equipment direct current is needed?

Telephones
Relay
All of the listed here
Time switches

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