Electrical Machines
A 4 pole dc motor with armature winding resistance of 0.6 ohm receives a supply of 230 Volt. If the back emf produced during running condition is equal to 210 volt. Calculate the current flowing through the armature at this point.

 44.47 Amp.
 29 Amp.
  33.33 Amp.
  43 Amp.

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Electrical Machines
For a given torque, reducing diverter resistance of a DC series motor causes

 increase in speed demanding more armature current.
 decrease in speed but armature current remains the same.
 increase in speed but armature currnet remains the same.
 decrease in speed demanding less armature current.

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