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Electrical Machines

Electrical Machines
Hysteresis loss is proportional to

  f.
 f1.5.
 f3.
 f2.

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Electrical Machines
The field system of an alternator is usually excited

  3 - Φ, 50 Hz and 400 V.
  110 / 220 V AC.
  250 / 250 V DC.
  230 V AC.

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Electrical Machines
The torque developed in IM is nearly proportional to

  1 / V.
 1 / V2.
  V2.
  V.

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Electrical Machines
Type of single phase motor having highest power factor at full load is

  split phase.
  shaded pole type.
  capacitor start.
  capacitor run.

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Electrical Machines
A 4 pole DC generator rotates at 1500 rpm. How many times in a second, will the emf induced in each armature conductor changes its direction?

 750.
  100.
 200.
 500.

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Electrical Machines
What is the function of inter pole in DC generator?

  Both option B and C.
 To serve the economical aspects.
 To get a superior commutation.
 To neutralize the distortion of main field flux due to armature reaction.

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