Electrical Machines
In induction motor the 7th harmonic torque may make the motor rotate at (1 / 7)th synchronous speed. This is called

  resonance.
  cogging.
  harmonics.
  crawling.

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Electrical Machines
Which is the arrangement of windings in a core type single phase transformer?

 Half hv inside and half lv outside on each core limb
 Half lv inside and half hv outside on each core limb
 Sandwiched lv and hv discs on each core limb
 Lv on one core limb and hv on the other

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