Electrical Machines
In dc machines, the field-flux axis and armature-mmf axis are respectively along

 direct axis and interpolar axis
 quadrature axis and direct axis
 direct axis and indirect axis
 quadrature axis and interpolar axis

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Electrical Machines
For a given torque, reducing diverter resistance of a DC series motor causes

 increase in speed but armature currnet remains the same.
 decrease in speed demanding less armature current.
 increase in speed demanding more armature current.
 decrease in speed but armature current remains the same.

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Electrical Machines
What will happen if the the supply terminals are reversed in case of a DC shunt motor?

 The motor will run in reverse direction.
 The motor will run much faster in the same direction.
 The motor will stop.
 The motor will run at its normal speed in the same direction as before.

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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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