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Electrical Machines

Electrical Machines
If B is flux density, l the length of the conductor and v the velocity of the conductor, then emf is given by

 Bl2v.
 Blv2.
 Blv.
 Bl2v2.

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Electrical Machines
Open circuit test on transformer gives

 eddy current loss
 both 1and 2
 copper loss
 hysteresis loss

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Electrical Machines
Number of tappings for each equalizer ring is equal to

  number of pole pairs.
  number of commutator segments.
  number of parallel paths.
  number of poles.

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

 any of the above
 greater than
 equal to
 less than

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Electrical Machines
A 4-pole dc generator runs at 1500 rpm. The frequencyof current in the armature winding is

 50 Hz
 100 Hz
 25 Hz
 0 Hz

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Electrical Machines
In most condition which frame of motor will be preferred?

  Totally enclosed fan coiled.
 Splash proof.
 Drip proof.
 Open type.

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