Electrical Machines
Tappings of a transformer are provided

 at the phase end of lv side
 at the neutral side end of hv side
 at the middle of hv side
 at the phase end of hv side

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Electrical Machines
The mmf produced by rotor currents of a 3 - Φ induction motor

  rotates at synchronous speed with respect to rotor.
  rotates at slip speed with respect to stator mmf.
  rotates at the speed of rotor in the air gap.
  is at standstill with respect to stator mmf.

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