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

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

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Electrical Machines
For an ideal transformer the winding should have

 maximum resistance on primary side and least resistance on secondary side
 equal resistance on primary and secondary side
 minimum resistance on primary side and maximum resistance on secondary side
 no ohmic resistance on either side

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Electrical Machines
What will happen if the the supply terminals are reversed in case of a DC shunt motor?

 The motor will run in reverse direction.
 The motor will run much faster in the same direction.
 The motor will run at its normal speed in the same direction as before.
 The motor will stop.

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