Electrical Machines
A dc shunt motor has external resistance Ra and Rf in the armature and field circuits respectively. Armature current at starting can be reduced by keeping

 Ra minimum and Rf minimum
 Ra maximum and Rf maximum
 Ra maximum and Rf minimum
 Rf maximum and Ra minimum

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Electrical Machines
With the increase in speed of a DC motor

 both back emf as well as line current increase.
 both back emf as well as line current fall.
 back emf falls and line current increases.
 back emf increases but line current falls.

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