Electrical Machines
Air core transformer as compared to iron core transformer, has

 more magnetic core loss.
  no magnetic core loss.
  more copper loss.
 less magnetic core loss.

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Electrical Machines
In a DC machine

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

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