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Electrical Machines

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

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

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Electrical Machines
In dc machines, 1. reactance voltage is proportional to armature current 2.reactance voltage is proportional to core length 3.reactance voltage is due to self-flux of the coil undergoing commutation 4. armature-cross flux is neutralized by interpolar flux 5. interpolarmmf is more than armature mmf in the interpolar zone From these, the correct answer is

 2, 3, 4
 1, 2, 3, 4
 1, 3, 5
 1, 2, 5

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Electrical Machines
Mechanical energy is supplied to DC generator at the rate of 4200 J / s. The generator delivers 32.2 Amp at 120 V. What is the percentage efficiency of the generator?

  201.02 V.
 205 V.
 210 V.
 212 V.

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Electrical Machines
In a DC generator sparking between brushes and commutator surface may be due to

  too rapid reversal of current.
 over commutation.
  under commutation.
  any of the above.

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Electrical Machines
stepped cores are used in transformers in order to reduce

 volume of copper.
 reluctance of core.
 iron loss.
 volume of iron.

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Electrical Machines
The output power indicated on the name plate of any motor is always the

 Power drawn in KW.
 Power drawn in KVA.
 Gross power.
 Output power at the shaft.

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