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Electrical Machines

Electrical Machines
The speed of rotating magnetic field of 8 pole 50 Hz induction motor is

 1500 rpm
 3000 rpm
 750 rpm
 1000 rpm

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Electrical Machines
What is the speed of stator rotating magnetic field with respect to rotor rotating magnetic field?

 Slip speed
 Synchronous speed
None of these
 Zero

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Electrical Machines
1 KVA, 230 V, 50 Hz, single phase transformer has an eddy current loss of 30 watts. The eddy current loss when the transformer is excited by a dc source of same voltage will be

 zero watt
 less than 30 W
 30 W
 more than 30 W

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Electrical Machines
Autotransformer makes effective saving on copper and copper losses, when its transformation ratio is equal to

  very low
  greater than one.
  approx to one.
  less than one.

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Electrical Machines
To achieve spark less commutation brushes of DC generator are rocked ahead so as to bring them

 in magnetic neutral axis.
None of these
 just ahead of magnetic neutral axis.
 just behind the magnetic neutral axis.

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Electrical Machines
Maximum efficiency will occur, when copper loss is_______to iron loss?

 equal to
 any of the above
 less than
 greater than

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