Electrical Machines
DC machine is a

 both are correct.
 convection machine.
 none of above are correct.
 conduction machine.

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Electrical Machines
In a DC machine

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

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