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

  cogging.
  harmonics.
  crawling.
  resonance.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
An ideal synchronous motor has no starting torque because

 relative velocity between the stator and rotor mmf’s is zero.
  relative velocity between stator and rotor mmf’s is not zero.
 rotor is made up of salient poles.
 rotor winding is highly reactive.

ANSWER DOWNLOAD EXAMIANS APP