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Rectifiers and Converters

Rectifiers and Converters
The efficiency of an electrolytic rectifier is nearly

50 %
40 %
60 %
70 %

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

Mercury arc rectifiers
Mechanical rectifiers
Selenium rectifiers
Copper oxide rectifiers

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Rectifiers and Converters
Selenium rectifier can be operated at temperatures as high as

75°C
40°C
60°C
25°C

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Rectifiers and Converters
In a glass bulb mercury arc rectifier the maximum current rating is restricted to

2000 A
500 A
200 A
1500 A

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

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

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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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