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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

Remain same
More
Less
None of the listed here

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Rectifiers and Converters
The metal rectifiers, as compared to mercury arc rectifiers

operate on low temperatures
can operate on high voltages
can operate on heavy loads
give poor regulation

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Rectifiers and Converters
Normally, which of the following is used, when a large-scale conversion from AC. to D.C. power is required?

Rotary converter
Mercury arc rectifier
Motor-generator set
Motor converter

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Rectifiers and Converters
The internal efficiency of a mercury arc rectifier depends on

voltage only
current only
voltage and current
r.m.s. value of current

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Rectifiers and Converters
In a phase-shift control method, the phase shift between anode and grid voltages can be achieved by means of

Synchronous generator
Induction regulator
Shunt motor
Synchronous motor

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

500 A
2000 A
1500 A
200 A

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