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Rectifiers and Converters

Rectifiers and Converters
A rotary converter operates at a

high power factor
zero power factor
low power factor
None of the listed here

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

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

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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
In a mercury arc rectifier______ flow from anode to cathode

electrons
ions
ions and electrons
All of the listed here

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Rectifiers and Converters
Copper oxide rectifier is usually designed not to operate above

45°C
30°C
55°C
75°C

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

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

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