Transformers
The flux in the core of a single phase transformer is _____

Purely alternating one
None of the listed here
Partly alternating and partly rotating
Purely rotating one

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Transformers
In a power or distribution transformer about 10 per cent end turns are heavily insulated

to absorb the line surge voltage and save the winding of transformer from damage
to reflect the line surge and save the winding of a transformer from damage
None of these
to withstand the high voltage drop due to line surge produced by the shunting capacitance of the end turns

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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
pulling the motor directly on line without a starter
starting the motor on load which is more than the rated load

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