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Rectifiers and Converters

Rectifiers and Converters
In a rotary converter armature currents are

d.c. only
None of the listed here
a.c. only
partly a.c. and partly d.c.

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Rectifiers and Converters
Which of the following rectifiers have been used extensively in supplying direct current for electroplating?

Copper oxide rectifiers
Mechanical rectifiers
Mercury arc rectifiers
Selenium rectifiers

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

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

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Rectifiers and Converters
Mercury, in arc rectifiers, is chosen for cathode because

Its boiling point and specific heat are low
Its atomic weight is quite high
All of the listed here
Its ionization potential is relatively low

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Rectifiers and Converters
The voltage drop between the anode and cathode, of a mercury arc rectifier comprises of the following

cathode drop and arc drop
anode drop, cathode drop and arc drop
anode drop and arc drop
anode drop and cathode drop

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Rectifiers and Converters
A synchronous converter can be started

by means of a small auxiliary motor
from A.C. side as induction motor
from D.C. side as D.C. motor
All of the listed here

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