Electrical Machines
In a step down transformer which one of the following statements is true?

 Secondary power is less than primary power.
 Number of secondary turns is more than that of primary.
  Number of secondary turns is less than primary turns.
 Secondary current is less than primary current.

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

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

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Electrical Machines
For an ideal transformer the winding should have

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

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