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Electrical Machines

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

 3000 rpm
 1500 rpm
 1000 rpm
 750 rpm

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Electrical Machines
A 230 volt dc motor has an armature winding resistance of 0.5 ohm. Calculate the emf induced by the motor if the full load armature current is 23 ampere.

  218.5 volt.
  None of these.
  120 volt.
 220.4 volt.

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Electrical Machines
A simple method of increasing the voltage of a DC generator is to

 increase the source frequency.
 increase the number of turns in armature coil.
  increase the speed of shaft rotation.
 increase the number of turns in field coil.

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Electrical Machines
Which of following DC generator will be in a position to build up without any residual magnetism in the field?

  Separately excited.
 Shunt.
  Series.
  Compound.

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Electrical Machines
A 4 pole dc motor with armature winding resistance of 0.6 ohm receives a supply of 230 Volt. If the back emf produced during running condition is equal to 210 volt. Calculate the current flowing through the armature at this point.

  43 Amp.
  33.33 Amp.
 44.47 Amp.
 29 Amp.

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Electrical Machines
The magnetic field which initially induces emf in the armature in a self excited DC generator is because of

 armature reaction.
  residual magnetism.
None of these
  permanent magnets.

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