Electrical Machines
A DC series motor is running with a divertor connected across its field winding. If the divertor resistance is reduced then the speed of the motor will

 become execessively high.
 increase.
 decrease.
 remain unaltered.

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Electrical Machines
In a DC machine

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

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