Electrical Machines
An ideal synchronous motor has no starting torque because

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

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Electrical Machines
If two 8-pole dc machines of identical armature sare wound, one with lap winding and the other with wave winding, then

 lap-wound machine will have more rated voltage and more current
 wave-wound machine will have more rated voltage and less current
 lap-wound machine will have more rated voltage and less current
 wave-wound machine will have more rated current and more voltage

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