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Electrical Machines

Electrical Machines
The emf induced in a conductor rotating in a bipolar field is

 AC.
 both of above.
None of these
 DC.

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Electrical Machines
The armature core of the rotor bars of dc motors are laminated

  to reduce hysteresis loss.
  to reduce eddy current loss.
  to reduce mechanical losses.
  to provide better flux linkage.

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Electrical Machines
A synchronous generator is feeding a zero power factor (lagging) load at rated current. The armature reaction is

 cross – magnetizing.
 magnetizing.
 ineffective.
  demagnetizing.

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Electrical Machines
DC series motor is best suited for electric traction as

 It is cheaper in cost.
 It consume less power.
  It develops high starting torque.
 It runs at very high speed at light load.

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Electrical Machines
Which of the following is/are the advantages of carbon brush over the copper brush?

 In case of any sparking they will be less damaged than copper brushes
 They are not hard as copper brush
All of these
 They are self lubricating in nature

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Electrical Machines
In DC generators brushes are used for

 collecting of voltage
 convert ac armature current in to dc
 collecting of current without any sparkings
 reduce eddy current loss

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