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QUESTIONS

Chemistry
The number of d-electrons in Fe2+ (Z = 26) is not equal to that of

p-electrons in CI(Z = 17)
p-electrons in Ne(Z = 10)
d-electrons in Fe(Z = 26)
s-electrons in Mg(Z = 12)

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

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

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Rectifiers and Converters
A synchronous converter can be started

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

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Rectifiers and Converters
In a single phase rotary converter the number of slip rings will be

Four
Two
Three
Six

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

Selenium rectifiers
Mechanical rectifiers
Mercury arc rectifiers
Copper oxide rectifiers

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