Electrical Machines
Which of the following is done in speed control of DC motor by field flux control?

 Inserting an additional resistance in the armature circuit.
 Inserting resistance to armature circuit and field circuit.
 Inserting an additional resistance in the field circuit.
 Any of above.

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Electrical Machines
Which is the arrangement of windings in a core type single phase transformer?

 Half lv inside and half hv outside on each core limb
 Half hv inside and half lv outside on each core limb
 Sandwiched lv and hv discs on each core limb
 Lv on one core limb and hv on the other

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

  Increase in speed demanding more armature current.
  Increase in speed but armature currnet remains the same.
  Decrease in speed demanding less armature current.
  Decrease in speed but armature current remains the same.

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