Electrical Machines
An ideal synchronous motor has no starting torque because

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

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Electrical Machines
Two 3-phase AC generators are such that one has twice the linear dimensions of the other. The field windings of each are excited to give identical sinusoidal air-gap flux density waveform. Both have the same number of stator slots and identical winding patterns. The conductor/slot in a big generator is K times that of the smaller one. The value of K to get equal no load voltage at same frequency is

 8.
  1/2.
 1/4.
 4.

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