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

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

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Electrical Machines
In a DC machine the armature mmf is

  stationary with respect to field poles.
  stationary with respect to armature.
  rotating with respect to field poles as well as armature.
 rotating with respect to field poles.

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