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Rectifiers and Converters

Rectifiers and Converters
In which of the following equipment direct current is needed?

Telephones
Time switches
All of the listed here
Relay

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

Variable speed operation
Electrolysis
Traction
Illumination

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Rectifiers and Converters
A rotary converter combines the function of

an induction motor and a D.C. generator
Both of the listed here
a synchronous motor and a D.C. generator
None of the listed here

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

Copper oxide rectifiers
Electrolytic rectifiers
Selenium rectifiers
Mechanical rectifiers

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Rectifiers and Converters
When a rectifier is loaded which of the following voltage drops take place ?

Voltage drop in resistance of transformer and smoothing chokes
Arc voltage drop
All of the listed here
Voltage drop in transformer reactance

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Rectifiers and Converters
A commutating rectifier consists of commutator driven by

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

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