Electrical Machines
In DC generators, the cause of rapid brush wear may be

 severe sparking.
 imperfect contact.
 rough commutator surface.
 any of above.

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

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