Transformers
In a transformer, leakage flux

Helps in transfer of energy
Is minimised by interleaving the primary and secondary windings
Produces mutually induced emf
Is negligible at full load

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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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