Electrical Machines
Direction of rotation of DC motor is reversed by

 Interchanging armature and field connection.
 Adding resistance to field circuit.
 Reversing armature connection or field connection.
 Reversing supply connection.

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Electrical Machines
In a DC machine

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

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