Electrical Machines
In dc machines, the field system has to be provided on stator unlike synchronous machines Where in it could be on any member, because

 dc machines are comparatively low rating machines.
 it gives more uniform air-gap flux distribution
 it reduces field structure iron losses
 commutator action is not possible otherwise

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

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

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