Electrical Machines
The factors that are responsible for decrease in terminal voltage of a shunt generator are

  reduction in field current, effect of armature reaction, armature.
 armature resistance, inter poles, armature.
  armature resistance, effect of armature reaction.
 armature resistance, effect of armature reaction.

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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.
 1/4.
  1/2.

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Electrical Machines
The armature mmf of a DC machine has

  trapezoidal space distribution and is stationary in space.
 stepped distribution and rotates at the speed of armature.
  triangular space distribution and is stationary in space.
  triangular space distribution and rotates at the speed of armature.

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