Transformers
When the secondary of a transformer is short circuited, the primary inductance _______

None of the listed here
Remians unchanged
Is increased
Is decreased

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

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

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