Electrical Machines
In synchronous generator, inverted V curve is drawn between

 field current on Y-axis and armature current on X-axis
 field current on Y-axis and power factor on X-axis
 field current on X-axis and armature current on Y-axis
 field current on X-axis and power factor on Y-axis

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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

 1/4.
  1/2.
 4.
 8.

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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

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

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