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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
Find the synchronous reactance of alternators in which a given field current of 200 A on short circuit and a generated emf of 50 V on open circuit. Armature resistance is 0.1 ohm

  0.23Ω.
 0.5Ω.
 0.25Ω.
 1Ω.

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Electrical Machines
On what factors the speed of dc motor depends?

 All of these.
 Field flux.
 Applied voltage.
 Armature current Ia.

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Electrical Machines
Pole changing methods are suitable only for ___________ type induction motor.

  wound.
  cage.
  linear.
  none of these.

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Electrical Machines
A lap wound DC machine has 400 conductors and 8 poles. The voltage induced per conductor is 2 volts. The machine generates a voltage of

 200 V.
 100 V.
 400 V.
 800 V.

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Electrical Machines
Total core loss is also called as -------------?

 Magnetic loss
 Copper loss
 Eddy current loss
 Hysteresis loss

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