Electrical Machines
The magnetic circuit of a dc shunt generator with negligible armature resistance and brush contact voltage drop remains unsaturated when it delivers full-load current at rated terminal voltage. The brushes are kept in the interpolar axis and speed is maintained constant. When the load is switched off, the terminal voltage would

 become zero
 remain the same
 increase
 decrease

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Electrical Machines
For an ideal transformer the winding should have

 equal resistance on primary and secondary side
 no ohmic resistance on either side
 minimum resistance on primary side and maximum resistance on secondary side
 maximum resistance on primary side and least resistance on secondary side

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Electrical Machines
The compensating winding in a DC machine

  is located on pole shoes for avoiding the flashover at the commutator.
 is located in armature slots for compensation of the armature reaction.
  is located on pole shoes to avoid the sparking at the brushes.
 is located on commutating poles for improving commutation.

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