Electrical Machines
In case the conditions for maximum power for DC motor are established, the efficiency of the motor will be

 Around 100 %.
 Less than 50 %
 Any where between 75 % and 90 %.
 Around 90 %

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Electrical Machines
The synchronous reactance( Xs) is the

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

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Electrical Machines
If two 8-pole dc machines of identical armature sare wound, one with lap winding and the other with wave winding, then

 wave-wound machine will have more rated voltage and less current
 wave-wound machine will have more rated current and more voltage
 lap-wound machine will have more rated voltage and more current
 lap-wound machine will have more rated voltage and less current

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