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

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

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

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