Electrical Machines
A part an alternator winding consist of eight coils in series, each having an emf of 20 V rms induced in it. Coils are placed in successive slots and between each slot and the next, there is an electrical phase displacement of 30°. Find the emf of eight coils in series

 86.91 V.
 76.91 V.
 56.91 V.
  66.91 V.

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

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