Transformers
In an auto transformer, the primary and secondary are _____ coupled.

Only electrically
Only magnetically
Magnetically as well as electrically
None of the listed here

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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
locking of rotor due to harmonics
pulling the motor directly on line without a starter
interchanging two supply phases for quick stopping

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