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Electrical Machines

Electrical Machines
Which of the following induction motor has maximum speed?

 6 pole.
  2 pole.
 8 pole.
 4 pole.

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Electrical Machines
The brushes of a DC machine should be placed on the

 commutator in the polar axis.
 armature midway between poles.
 armature in the polar axis.
 commutator in the inter polar axis.

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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

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

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Electrical Machines
In shunt dc motor the direction of rotation of the motor will reversed. When

  only field terminals are changed.
  only armature terminals are reversed.
  either field terminals are reversed or armature terminals are reversed.
  none of above.

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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

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

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Electrical Machines
Maximum allowable tan - delta (tanδ) of dielectric dispassion factor of power transformer insulating oil is generally taken as

 3 at 90°C.
 2 at 90°C.
  1 at 90°C.
 0.5 at 90°C.

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