Electrical Machines
Ratio of starting torque to full load torque is minimum in

  Differential compound motor.
  Series motor.
  Shunt motor.
  Cumulative compound motor.

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

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

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