Transformers
The voltage transformation ratio of a transformer is equal to the ratio of

secondary induced e.m.f. to primary induced e.m.f.
secondary current to primary current
primary turns to secondary turns
secondary terminal voltage to primary applied voltage

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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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