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Electrical Machines

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

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

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Electrical Machines
A 220 V DC machine has an armature resistance 1Ω. If the full load current is 20 A, the difference of induced voltage and generator is

 60 V.
 0 V.
 20 V.
  40 V.

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Electrical Machines
Induction motor operation depends on

 rotating magnetic field.
 stationary magnetic field.
None of these
 either of these.

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Electrical Machines
Magnetic field of a DC generator is produced by what?

 None of the options.
 Permanent magnets.
  Electromagnets.
 Both B and C.

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Electrical Machines
Semi closed slots or totally closed slots are used in induction motors, essentially to

 reduce magnetising current and improve power factor
 improve starting torque
 decrease starting torque
 increase pull out torque

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Electrical Machines
In a transformer, hysteresis and eddy current losses depend upon

 both 2 and 3
 supply frequency
 maximum flux density
 load current

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