Transformers
Which of the following is the main advantage of an auto-transformer over a two winding transformer?

Eddy losses are totally eliminated
Saving in winding material
Copper losses are negligible
Hysteresis losses are reduced

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Transformers
In case of 3-phase induction motors, plugging means

pulling the motor directly on line without a starter
locking of rotor due to harmonics
interchanging two supply phases for quick stopping
starting the motor on load which is more than the rated load

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