Electrical Machines
A DC series motor drawing an armature current of Ia is operating under saturated magnetic conditions. The torque developed in the motor is proportional to

 I/Ia2
 1/Ia
 Ia2
 Ia

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

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