Electrical Machines
What will be the e.m.f. generated by a 4 pole lap connected DC Generator rotating at 1500 r.p.m.? Its flux per pole is 0.4 mWb and total no of armature conductors is 1000.

 40 volts.
 10 volts.
 30 volts.
 20 volts.

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Electrical Machines
Armature reaction in a DC machine

  makes an angle of 90° with the main pole axis.
 makes an angle with the main pole axis which is load dependent.
 is in the same direction as the main poles.
 is in direct opposition to the main poles.

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