Transformers
Which type of winding is used in 3phase shell-type transformer?

Circular type
Cylindrical type
Sandwich type
Rectangular type

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

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

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