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Electrical Machines

Electrical Machines
The wattage rating of a ceiling fan motor will be

 250 - 500 W.
 10 - 20 W.
  50 - 150 W.
 200 - 250 W.

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Electrical Machines
No load test of 3-phase induction motor gives which of the following?

None of these
 both A and B
 constant loss
 variable loss

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Electrical Machines
The reduced air gap results in an increase

  breaking torque.
  power factor.
  cost of operation.
  starting torque.

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

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

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Electrical Machines
In an auto-transformer, power is transferred through

None of these
 both A and B.
 induction process only.
 conduction process only.

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Electrical Machines
If the temperature of armature resistance is increased, the speed of a series motor would

 not change.
 decrease.
 None of above.
 increase.

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MORE MCQ ON Electrical Machines

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