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

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

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

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
pulling the motor directly on line without a starter

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