Transformers
The transformer that should never the secondary open circuited when primary is energised is _______

Current transformer
Voltage transformer
Power transformer
Auto transformer

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

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