Electrical Machines
Flashing the field of DC generator means

 increasing flux density by adding extra turns of winding.
  neutralising residual magnetism.
  making the magnetic losses forces parallel.
  creating residual magnetism by a DC source.

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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

 4.
 8.
  1/2.
 1/4.

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Electrical Machines
For a given torque, reducing diverter resistance of a DC series motor causes

 decrease in speed but armature current remains the same.
 increase in speed but armature currnet remains the same.
 increase in speed demanding more armature current.
 decrease in speed demanding less armature current.

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