Electrical Machines
The direction of rotation of a DC motor can be determent by

  Flemings left hand rule.
 Flemings right hand rule.
 Lenzs law.
 Amperes law.

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Electrical Machines
The residual magnetism of a self-excited dc generator is lost. To build up its emf again

 the armature connection must be reversed
 the field winding must be replaced
 the field winding connection must be reversed
 field winding must be excited by low voltage dc supply

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