Electrical Machines
If the handle of a three point starter goes to back to OFF position, it may be due to

 over load.
 zero or very low voltage supply.
 high filed circuit resistance.
 all of these.

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Electrical Machines
An ideal synchronous motor has no starting torque because

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

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Electrical Machines
Cogging and crawling are phenomena associated with

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

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