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Rectifiers and Converters

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

Traction
Illumination
Variable speed operation
Electrolysis

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Rectifiers and Converters
The metal rectifiers are preferred to valve rectifiers due to which of the following advantages ?

They are mechanically strong
Both of the listed here
None of the listed here
They do not require any voltage for filament heating

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Rectifiers and Converters
It is the_______of the transformer on which the magnitude of angle of overlap depends.

all of the listed here
leakage reactance
resistance
capacitance

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Rectifiers and Converters
Which of the following AC. motors is usually used in large motor-generator sets?

Squirrel cage induction motor
Synchronous motor
Any of the listed here
Slip ring induction motor

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Rectifiers and Converters
A commutating rectifier consists of commutator driven by

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

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Rectifiers and Converters
Which of the following is the loss within the mercury arc rectifier chamber?

All of the listed here
Voltage drop at the anode
Voltage drop at the cathode
Voltage drop in arc

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