Electrical Machines
Direction of rotation of DC motor is reversed by

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

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Electrical Machines
In a DC machine

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

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