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Electrical Machines

Electrical Machines
A 100/10, 50 VA double winding transformer is converted to 100/110 V auto transformer. The rating of auto transformer is

 500 VA
 550 VA
 110 VA
 100 VA

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Electrical Machines
In which of the following, voltage regulation may be zero or negative

 unity power factor
 leading power factor
 lagging power factor
All of these

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Electrical Machines
For a 3 - Φ, 4 pole, 50 Hz IM rotating at full load speed of 1440 rpm, calculate speed of rotor field with respect to rotor structure and stator structure respectively?

 60, 1440.
 1440, 1500.
  60, 1500.
 50, 1500.

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Electrical Machines
stepped cores are used in transformers in order to reduce

 volume of copper.
 volume of iron.
 reluctance of core.
 iron loss.

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Electrical Machines
In an auto transformer, for what value of turn ratio, power transferred by inductively and conductively are same?

 any of the above
 0.5
 1
 0

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Electrical Machines
Maximum power developed by a synchronous motor depends on

 excitation and load angle
 supply voltage, load angle and excitation
 supply voltage and load angle
 supply voltage and excitation

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