Transformers
A transformer has full load copper loss of 400 W. The copper loss at half full load will be _____.

200 W
None of the listed here
100 W
400 W

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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
starting the motor on load which is more than the rated load
interchanging two supply phases for quick stopping

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