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Rectifiers and Converters

Rectifiers and Converters
In a rotary converter I2R losses as compared to a D.C. generator of the same size will be

None of the listed here
Less
Remain same
More

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

55°C
45°C
30°C
75°C

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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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Rectifiers and Converters
Which of the following is reversible in action?

Motor generator set
Rotary converter
Motor converter
All of the listed here

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Rectifiers and Converters
In a grid control of mercury arc rectifiers when the grid is made positive relative to cathode, then it the electrons on their may to anode.

decelerates
accelerates
any of the listed here
none of the listed here

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Rectifiers and Converters
In mercury arc rectifiers having grid, the arc can be struck between anode and cathode only when the grid attains a certain potential, this potential being known as

maximum grid voltage
critical grid voltage
all of the listed here
non of the listed here

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