Electrical Machines
In a DC machine

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

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Electrical Machines
With the increase in speed of a DC motor

 both back emf as well as line current fall.
 back emf falls and line current increases.
 back emf increases but line current falls.
 both back emf as well as line current increase.

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