Electrical Machines
Tappings of a transformer are provided

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

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Electrical Machines
Slip speed is the

  sum of synchronous and rotor speeds.
  difference of synchronous speed and actual rotor speed.
  half of the sum of synchronous and rotor speeds.
  difference of actual rotor speed and synchronous speed.

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Electrical Machines
Cogging and crawling are phenomena associated with

 the former at a fraction of its rate speed and the latter during starting.
 cage induction machines and they are essentially the same.
 any of the above.
 the former during starting and the latter at a fraction of its rated speed.

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