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

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

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
Commutation in a DC machine may be explained as a process

 by virtue of which emf is induced in the armature conductors.
  by which electric current in a coil is reversed.
  in which magnetic field is set up.
 how alternate flux affects the main field flux.

ANSWER DOWNLOAD EXAMIANS APP