Transformers
The efficiencies of transformers compared with that of electric motors of the same power are

much higher
somewhat smaller
about the same
much smaller

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

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

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