Electrical Machines
Which of the following machine is invariably provided with forced ventilation?

 Fractional horse power slow speed motor.
  Hermetically sealed motor of refrigerator.
 50 MW generator in a power plant.
 Fractional horse power high speed motor.

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

 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.
 increase in speed demanding more armature current.

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