Transformers
Short circuit test of a transformer helps us to find its

Full load cu loss
Iron loss
None of the listed here
Cu loss at no load

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

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

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