Electrical Machines
The mechanical power is developed by a DC motor is maximum when

 back emf is equal to twice of applied voltage.
 none of above.
 back emf is equal to half of applied voltage.
 back emf is equal to applied voltage.

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Electrical Machines
The synchronous reactance( Xs) is the

 reactance either due to armature reaction or leakage flux
 combined reactance due to armature reaction and leakage flux
 reactance due to leakage flux
 reactance due to armature reaction of the machine

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