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

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

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Electrical Machines
Slip speed is the

  half of the sum of synchronous and rotor speeds.
  difference of synchronous speed and actual rotor speed.
  sum of synchronous and rotor speeds.
  difference of actual rotor speed and synchronous speed.

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Electrical Machines
The compensating winding in a DC machine

 is located in armature slots for compensation of the armature reaction.
  is located on pole shoes to avoid the sparking at the brushes.
 is located on commutating poles for improving commutation.
  is located on pole shoes for avoiding the flashover at the commutator.

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