Electrical Machines
In a DC machine

 current and emf in armature are alternating.
 current and emf in armature are unidirectional
 emf in armature conductors and at the terminals is alternating.
 current and emf at the terminals are alternating.

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

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

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