Transformers
The mutual flux in a transformer remains constant at all loads because ______

Iron core is used
Leakage flux is small
Losses are small
Applied voltage and frequency are constant

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

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

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